7Baggers

Regency Centers Quarterly Balance Sheets Chart

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Regency Centers Quarterly Balance Sheets Table

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Annual
 
Unit: USD2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 
                                                                                  
  assets                                                                                
  net real estate investments:                                                                                
  real estate assets, at cost13,988,815,000 13,910,190,000 13,698,419,000 13,620,602,000 13,532,046,000 13,456,499,000 13,454,391,000 13,361,194,000 11,953,086,000 11,886,697,000 11,858,064,000 11,769,796,000 11,762,300,000 11,567,492,000 11,495,581,000 11,302,487,000 11,123,004,000 11,165,567,000 11,137,612,000 11,095,294,000 11,142,239,000 10,878,303,000 10,875,058,000 10,863,162,000                                                         
  less: accumulated depreciation3,107,560,000 3,037,614,000 2,960,399,000 2,894,010,000 2,822,272,000 2,748,712,000 2,691,386,000 2,619,345,000 2,549,937,000 2,484,960,000 2,415,860,000 2,360,663,000 2,301,183,000 2,235,869,000 2,174,963,000 2,149,681,000 2,106,958,000 1,893,250,000 1,829,005,000 1,766,162,000 1,723,963,000 1,656,527,000 1,605,681,000 1,535,444,000 1,474,769,000 1,433,120,000 1,394,276,000 1,339,771,000 1,281,510,000 1,225,474,000 1,166,657,000 1,124,391,000 1,108,221,000 1,079,448,000 1,060,922,000 1,043,787,000 1,014,788,000 990,744,000 961,830,000 933,708,000 909,572,000 892,695,000 864,975,000 844,873,000 835,447,000 823,601,000 808,699,000 782,749,000 768,301,000 834,681,000 813,187,000 791,619,000 769,829,000 755,378,000 729,133,000 700,878,000 695,432,000 672,342,000 646,236,000 622,163,000 632,407,000 607,944,000 577,737,000 554,595,000 545,979,000 538,779,000 518,614,000 497,498,000 478,560,000 459,179,000 441,432,000 427,389,000 421,650,000 412,762,000 398,371,000 380,613,000 371,386,000 364,362,000 352,818,000 338,609,000 
  real estate assets10,881,255,000 10,872,576,000 10,738,020,000 10,726,592,000 10,709,774,000 10,707,787,000 10,763,005,000 10,741,849,000 9,403,149,000 9,401,737,000 9,442,204,000 9,409,133,000 9,461,117,000 9,331,623,000 9,320,618,000 9,152,806,000 9,016,046,000 9,272,317,000 9,308,607,000 9,329,132,000    9,327,718,000                                                         
  investments in sales-type leases16,609,000 16,520,000 16,291,000                                                                              
  investments in real estate partnerships389,828,000 389,175,000 399,044,000 387,413,000 378,091,000 368,709,000 370,605,000 382,300,000 342,439,000 346,390,000 350,377,000 332,248,000 330,887,000 357,998,000 372,591,000 379,704,000 409,627,000 474,285,000 489,500,000 469,522,000 472,863,000 465,495,000 456,733,000 463,001,000 458,051,000 451,220,000 448,257,000 386,304,000 380,930,000 376,800,000 381,691,000 296,699,000 274,940,000 279,270,000 287,500,000 306,206,000 321,164,000 309,544,000 325,243,000 333,167,000 328,398,000 339,922,000 353,772,000 358,849,000 414,509,000 428,606,000 432,287,000 442,927,000 450,021,000 424,726,000 395,933,000 386,882,000 425,460,000 425,559,000 408,238,000 428,592,000 462,778,000 449,413,000 333,963,000 326,212,000 333,620,000 338,107,000 368,313,000 383,408,000 428,730,000 423,138,000 430,889,000 432,910,000 446,653,000 429,106,000 435,251,000 434,090,000 426,494,000 424,844,000 438,228,000 545,617,000 551,697,000 567,666,000 180,478,000 179,677,000 
  net real estate investments11,287,692,000 11,278,271,000 11,153,355,000 11,130,061,000 11,103,691,000 11,088,028,000 11,142,315,000 11,132,707,000 9,745,588,000 9,748,127,000 9,792,581,000              9,874,272,000 9,934,653,000 10,010,225,000 9,939,354,000 9,973,479,000 10,014,231,000 10,196,730,000 4,105,807,000 4,064,932,000 4,051,500,000 3,776,194,000 3,808,319,000 3,805,369,000 3,787,836,000 3,809,200,000 3,809,345,000 3,731,300,000 3,702,682,000 3,700,813,000 3,540,507,000 3,550,059,000 3,564,435,000 3,576,584,000 3,570,090,000 3,512,895,000 3,731,244,000 3,706,336,000 3,697,175,000 3,806,962,000 3,746,891,000 3,680,047,000 3,716,868,000 3,734,974,000 3,710,788,000 3,607,140,000 3,637,827,000 3,788,553,000 3,920,048,000 3,938,191,000 3,871,300,000 3,955,258,000 4,029,177,000 3,957,378,000 3,900,697,000 3,863,056,000 3,744,358,000 3,582,445,000 3,474,244,000 3,497,276,000 3,431,642,000 3,314,978,000 3,394,820,000 3,371,046,000 3,351,334,000 2,993,642,000 2,994,062,000 
  properties held for sale15,553,000 16,220,000    33,572,000 18,878,000     2,354,000 2,354,000 2,354,000 25,574,000 22,077,000  27,812,000 27,889,000 45,565,000 35,563,000 15,106,000 15,275,000 60,516,000 51,892,000 102,163,000 8,742,000  27,802,000 19,600,000 19,600,000   29,365,000 26,861,000                                              
  cash, cash equivalents, and restricted cash, including 4,133 and 5,601 of restricted cash at june 30, 2025 and december 31, 2024, respectively154,819,000                                                                                
  tenant and other receivables260,824,000 250,210,000 255,495,000 240,114,000 236,999,000 229,407,000 206,162,000 199,439,000 206,053,000 181,579,000 188,863,000 173,572,000 159,643,000 151,852,000 153,091,000 139,287,000 131,510,000 186,232,000 148,058,000 169,337,000 161,381,000 157,883,000 160,635,000 172,359,000    170,985,000    111,722,000                                                 
  deferred leasing costs, less accumulated amortization of 134,870 and 131,080 at june 30, 2025 and december 31, 2024, respectively87,027,000                                                                                
  acquired lease intangible assets, less accumulated amortization of 410,383 and 395,209 at june 30, 2025 and december 31, 2024, respectively218,995,000                                                                                
  right of use assets319,091,000 320,317,000 322,287,000 323,660,000 323,015,000 326,047,000 328,002,000 301,821,000 303,716,000 273,702,000 275,513,000 277,656,000 278,153,000 279,892,000 280,783,000 284,317,000 284,440,000 289,739,000 290,993,000 292,786,000 294,051,000 295,084,000 296,859,000                                                          
  other assets386,473,000 299,717,000 289,046,000 297,178,000 306,077,000 399,433,000 283,429,000 299,479,000 280,843,000 276,926,000 267,797,000 275,702,000 268,600,000 267,428,000 266,431,000 271,052,000 276,207,000 259,850,000 260,500,000 390,729,000 398,945,000 410,745,000 412,851,000 403,827,000 427,726,000 429,497,000 431,181,000 427,127,000 390,778,000 307,429,000 70,526,000 37,079,000 24,749,000 29,561,000 27,565,000 21,876,000 24,815,000 28,392,000 20,126,000 15,136,000 41,779,000 41,535,000 38,916,000 52,465,000 44,467,000 46,458,000 27,500,000 18,811,000 29,992,000 32,150,000 28,731,000 31,824,000 36,419,000 39,474,000 34,321,000 35,164,000 34,452,000 28,874,000 31,248,000 50,203,000 39,378,000 44,647,000 44,927,000 43,928,000 38,897,000 40,470,000 36,356,000 33,651,000 40,488,000 49,043,000 30,266,000 23,041,000 38,113,000 36,149,000 30,062,000 23,747,000 22,165,000 15,956,000 21,248,000 12,711,000 
  total assets12,730,474,000 12,560,070,000 12,391,961,000 12,426,579,000 12,384,180,000 12,650,903,000 12,426,913,000 12,381,414,000 10,827,945,000 10,805,680,000 10,860,220,000 10,898,837,000 10,901,815,000 10,840,164,000 10,792,563,000 10,853,903,000 10,640,166,000 11,386,309,000 11,568,311,000 11,132,253,000 11,172,950,000 10,947,189,000 11,017,604,000 10,944,663,000 11,057,030,000 11,181,730,000 11,233,856,000 11,145,717,000 11,118,745,000 11,192,344,000 11,135,972,000 4,488,906,000 4,458,288,000 4,436,602,000 4,147,373,000 4,191,074,000 4,170,887,000 4,098,268,000 4,118,397,000 4,197,170,000 4,128,088,000 4,043,771,000 4,035,551,000 3,913,516,000 3,896,553,000 3,899,903,000 3,861,387,000 3,853,458,000 3,797,974,000 4,025,866,000 4,004,876,000 3,987,071,000 4,095,621,000 4,020,290,000 3,991,172,000 3,973,648,000 3,993,674,000 4,023,126,000 3,933,396,000 3,973,806,000 4,170,983,000 4,256,160,000 4,208,474,000 4,142,375,000 4,221,119,000 4,276,269,000 4,195,712,000              
  liabilities and equity                                                                                
  liabilities:                                                                                
  notes payable4,769,182,000 4,376,240,000 4,343,700,000 4,365,007,000 4,055,390,000 4,387,181,000 4,001,949,000 3,992,093,000 3,709,074,000 3,711,784,000 3,726,754,000 3,729,404,000 3,737,380,000 3,716,717,000 3,718,944,000 3,749,273,000 3,650,307,000 4,028,767,000 3,445,400,000 3,435,161,000 3,437,959,000 2,994,495,000 3,009,886,000 3,006,478,000 3,008,592,000 3,118,002,000 3,276,888,000 2,971,715,000 2,943,986,000 2,944,995,000 2,749,202,000 1,363,925,000 1,364,200,000 1,674,631,000 1,670,750,000 1,707,478,000 1,808,652,000 1,868,700,000 1,889,727,000 1,946,357,000 1,948,243,000 1,946,063,000 1,855,690,000 1,779,697,000 1,764,437,000 1,767,124,000 1,785,443,000 1,771,891,000 1,756,412,000 1,758,299,000 1,748,358,000 1,942,440,000 1,965,340,000 1,940,145,000 1,922,471,000 2,084,469,000 1,892,919,000 2,015,247,000 1,886,528,000 1,886,380,000 1,880,678,000 1,841,454,000 1,892,679,000 1,837,904,000 1,839,340,000 1,859,995,000 1,798,833,000 1,799,975,000 1,842,030,000 1,810,524,000 1,438,932,000 1,454,386,000 1,456,377,000 1,476,643,000 1,438,848,000 1,451,942,000 1,459,589,000 1,223,352,000 1,291,039,000 1,293,090,000 
  unsecured credit facility30,000,000 265,000,000 65,000,000 30,000,000 310,000,000 30,000,000 152,000,000 77,000,000  30,000,000                                                                       
  accounts payable and other liabilities381,549,000 340,997,000 392,302,000 389,055,000 357,232,000 344,641,000 358,612,000 360,102,000 317,894,000 289,297,000 317,259,000 328,285,000 322,409,000 278,265,000 322,271,000 327,710,000 313,896,000 223,990,000 194,835,000 213,705,000 219,529,000 188,723,000 183,983,000 224,807,000 236,250,000 215,300,000 212,515,000 234,272,000 276,363,000 246,462,000 242,638,000 138,936,000 145,689,000 165,611,000 157,732,000 164,515,000 171,304,000 142,415,000 166,659,000 181,197,000 173,997,000 141,063,000 136,800,000 147,045,000 147,087,000 131,181,000 121,120,000 127,185,000 129,483,000 111,995,000 104,819,000 101,862,000 114,873,000 121,617,000 120,949,000 101,047,000 144,481,000 98,810,000 84,342,000 99,145,000 105,093,000 113,006,000 113,607,000 141,395,000 156,530,000 155,561,000 147,292,000 164,479,000 185,428,000 172,569,000 144,865,000 140,940,000 146,893,000 145,202,000 103,875,000 110,800,000 103,009,000 112,164,000 79,919,000 102,443,000 
  acquired lease intangible liabilities, less accumulated amortization of 233,778 and 222,052 at june 30, 2025 and december 31, 2024, respectively366,625,000                                                                                
  lease liabilities243,704,000 243,923,000 244,861,000 245,107,000 243,318,000 245,235,000 246,063,000 242,394,000 243,462,000 212,582,000 213,722,000 215,100,000 214,800,000 215,705,000 215,788,000 218,776,000 218,069,000 221,035,000 221,703,000 222,918,000 223,581,000 223,959,000 225,122,000                                                          
  tenants' security, escrow deposits and prepaid rent82,474,000 82,864,000 81,183,000 80,586,000 74,565,000 75,919,000  81,875,000 77,093,000 75,643,000  76,777,000 63,510,000                                                                    
  total liabilities5,873,534,000 5,683,630,000 5,491,654,000 5,482,382,000 5,421,010,000 5,472,884,000 5,234,978,000 5,149,887,000 4,684,159,000 4,666,245,000 4,682,181,000 4,700,097,000 4,695,680,000 4,634,472,000 4,682,631,000 4,710,439,000 4,600,135,000 5,189,107,000 5,293,076,000 4,842,292,000 4,833,103,000 4,594,341,000 4,614,831,000 4,494,495,000 4,504,787,000 4,612,942,000 4,628,475,000 4,412,663,000 4,482,061,000 4,458,309,000 4,371,469,000 1,864,404,000 1,858,004,000 2,234,577,000 2,065,000,000 2,108,454,000 2,262,843,000 2,188,401,000 2,219,518,000 2,260,688,000 2,253,959,000 2,225,369,000 2,194,465,000 2,052,382,000 2,059,458,000 2,063,871,000 2,085,691,000 2,107,547,000 1,983,540,000 2,208,267,000 2,160,262,000 2,117,417,000 2,198,147,000 2,111,596,000 2,060,700,000 2,212,988,000 2,163,407,000 2,157,960,000 2,021,202,000 2,030,412,000 2,269,666,000 2,227,675,000 2,454,116,000 2,380,093,000 2,313,813,000 2,371,115,000 2,277,344,000 2,194,244,000 2,159,333,000 2,032,833,000 1,837,702,000 1,734,572,000 1,794,855,000 1,744,087,000 1,664,898,000 1,739,225,000 1,702,160,000 1,890,227,000 1,560,840,000 1,610,743,000 
  commitments and contingencies                                                                            3,557,659,000  3,195,566,000  
  equity:                                                                                
  shareholders' equity:                                                                                
  preferred stock 0.01 par value per share, 30,000,000 shares authorized; 9,000,000 shares issued and outstanding, in the aggregate, in series a and series b at june 30, 2025 and december 31, 2024225,000,000                                                                                
  common stock 0.01 par value per share, 220,000,000 shares authorized; 181,550,531 and 181,361,454 shares issued and outstanding at june 30, 2025 and december 31, 2024, respectively1,816,000                                                                                
  treasury stock-30,210,000 -29,133,000 -28,045,000 -27,638,000 -27,234,000 -26,321,000 -25,488,000 -25,081,000 -24,676,000 -25,699,000 -24,461,000 -24,061,000 -23,882,000 -23,831,000 -22,758,000 -25,318,000 -25,887,000 -24,597,000 -23,897,000 -23,199,000 -22,858,000 -22,536,000 -21,226,000 -19,834,000 -19,550,000 -19,268,000 -18,756,000 -18,307,000 -18,048,000 -18,105,000 -17,473,000 -17,062,000 -16,882,000 -16,843,000 -18,371,000 -19,658,000 -19,438,000 -19,390,000 -20,638,000 -19,382,000 -19,167,000 -18,952,000 -18,351,000 -16,726,000 -16,540,000 -16,352,000 -15,912,000 -14,924,000 -14,756,000 -14,792,000 -14,222,000 -15,197,000 -15,028,000 -14,985,000 -16,292,000      -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 -111,414,000 
  additional paid-in-capital8,512,308,000 8,505,489,000 8,503,227,000 8,509,021,000 8,502,753,000 8,703,756,000 8,704,240,000 8,684,012,000 7,859,249,000 7,856,426,000  7,878,993,000 7,874,461,000 7,882,764,000  7,882,613,000 7,796,699,000 7,785,095,000 7,780,336,000  7,650,056,000 7,645,065,000 7,639,353,000                                                          
  accumulated other comprehensive income-3,788,000 -1,715,000   5,135,000 4,465,000 -1,308,000 9,435,000 7,336,000 3,927,000 7,560,000 8,253,000 2,388,000            14,066,000 10,317,000 4,764,000                                 -49,973,000     -26,299,000 -18,762,000 -28,274,000 -18,916,000 -18,030,000 1,577,000        -16,521,000 -5,148,000 -5,291,000 
  distributions in excess of net income-2,027,254,000 -2,001,878,000 -1,980,076,000 -1,935,358,000 -1,911,741,000 -1,889,037,000 -1,871,603,000 -1,834,298,000 -1,803,406,000 -1,779,043,000 -1,764,977,000 -1,749,013,000 -1,729,645,000 -1,726,556,000 -1,814,814,000 -1,775,668,000 -1,791,773,000 -1,615,077,000 -1,533,182,000 -1,408,062,000 -1,350,331,000 -1,309,278,000 -1,263,011,000 -1,255,465,000 -1,240,331,000 -1,216,018,000 -1,169,828,000 -1,158,170,000 -1,153,153,000 -1,122,666,000 -1,080,882,000 -994,259,000 -997,881,000 -950,941,000 -936,945,000 -936,020,000 -907,962,000 -916,027,000 -902,845,000 -882,372,000 -912,041,000 -916,576,000 -898,787,000 -874,916,000 -878,753,000 -871,266,000 -860,832,000 -834,810,000 -756,114,000 -726,444,000 -690,845,000 -662,735,000 -629,626,000 -596,898,000 -568,526,000 -531,505,000 -457,372,000 -429,798,000 -398,699,000 -373,345,000 -361,530,000 -240,417,000 -186,227,000 -155,057,000 -80,067,000 -83,885,000 -65,049,000 -41,316,000 -45,931,000 -37,036,000 -35,535,000 -41,897,000 -62,324,000 -60,809,000 -52,129,000 -77,422,000 -83,530,000 -74,057,000 -79,538,000 -79,570,000 
  total shareholders' equity6,677,872,000 6,699,578,000 6,724,146,000 6,767,466,000 6,795,728,000 7,019,711,000  7,060,914,000 6,040,213,000 6,057,321,000                                                                       
  noncontrolling interests:                                                                                
  exchangeable operating partnership units, aggregate redemption value of 76,063 and 81,076 at june 30, 2025 and december 31, 2024, respectively38,359,000                                                                                
  limited partners' interests in consolidated partnerships140,709,000 136,278,000 135,417,000 135,841,000 126,704,000 116,702,000  116,699,000 49,292,000 47,703,000  48,303,000 46,491,000                                           10,829,000                         
  total noncontrolling interests179,068,000 176,862,000 176,161,000 176,731,000 167,442,000 158,308,000 159,248,000 170,613,000 103,573,000 82,114,000 81,054,000 82,857,000 81,102,000 73,365,000 72,561,000 72,743,000 72,951,000 75,219,000 75,813,000 76,613,000 77,108,000 52,007,000 52,078,000 52,198,000 40,149,000 40,688,000 41,080,000 41,002,000 41,222,000 41,749,000 33,154,000 33,201,000 33,139,000 35,269,000 35,702,000 28,511,000 29,018,000 29,132,000 29,225,000 29,890,000 28,908,000 32,491,000 32,734,000 17,780,000 12,429,000 12,414,000 12,902,000 15,146,000 15,097,000 15,203,000 12,084,000 61,299,000 61,276,000 61,095,000 61,240,000 59,225,000 59,691,000 59,782,000 66,507,000 68,227,000 68,520,000 66,507,000 65,789,000                  
  total equity6,856,940,000 6,876,440,000 6,900,307,000 6,944,197,000 6,963,170,000 7,178,019,000 7,191,935,000 7,231,527,000 6,143,786,000 6,139,435,000 6,178,039,000 6,198,740,000 6,206,135,000 6,205,692,000 6,109,932,000 6,143,464,000 6,040,031,000 6,197,202,000 6,275,235,000 6,289,961,000 6,339,847,000 6,352,848,000 6,402,773,000 6,450,168,000 6,552,243,000 6,568,788,000 6,605,381,000 6,733,054,000 6,636,684,000 6,734,035,000 6,764,503,000 2,624,502,000 2,600,284,000 2,202,025,000 2,082,373,000 2,082,620,000 1,908,044,000 1,909,867,000 1,898,879,000 1,936,482,000 1,874,129,000 1,818,402,000 1,841,086,000 1,861,134,000 1,837,095,000 1,836,032,000 1,775,696,000 1,745,911,000 1,814,434,000 1,817,599,000 1,844,614,000 1,869,654,000 1,897,474,000 1,908,694,000 1,930,472,000 1,760,660,000 1,830,267,000 1,865,166,000 1,912,194,000 1,943,394,000 1,901,317,000 2,028,485,000 1,754,358,000                  
  total liabilities and equity12,730,474,000 12,560,070,000 12,391,961,000 12,426,579,000 12,384,180,000 12,650,903,000 12,426,913,000 12,381,414,000 10,827,945,000 10,805,680,000 10,860,220,000 10,898,837,000 10,901,815,000 10,840,164,000 10,792,563,000 10,853,903,000 10,640,166,000 11,386,309,000 11,568,311,000 11,132,253,000 11,172,950,000 10,947,189,000 11,017,604,000 10,944,663,000 11,057,030,000 11,181,730,000 11,233,856,000 11,145,717,000 11,118,745,000 11,192,344,000 11,135,972,000 4,488,906,000 4,458,288,000 4,436,602,000 4,147,373,000 4,191,074,000 4,170,887,000 4,098,268,000 4,118,397,000 4,197,170,000 4,128,088,000 4,043,771,000 4,035,551,000 3,913,516,000 3,896,553,000 3,899,903,000 3,861,387,000 3,853,458,000 3,797,974,000 4,025,866,000 4,004,876,000 3,987,071,000 4,095,621,000 4,020,290,000 3,991,172,000 3,973,648,000 3,993,674,000 4,023,126,000 3,933,396,000 3,973,806,000 4,170,983,000 4,256,160,000 4,208,474,000                  
  cash, cash equivalents, and restricted cash, including 3,444 and 5,601 of restricted cash at march 31, 2025 and december 31, 2024, respectively 78,537,000                                                                               
  deferred leasing costs, less accumulated amortization of 133,046 and 131,080 at march 31, 2025 and december 31, 2024, respectively 85,272,000                                                                               
  acquired lease intangible assets, less accumulated amortization of 402,274 and 395,209 at march 31, 2025 and december 31, 2024, respectively 231,526,000                                                                               
  acquired lease intangible liabilities, less accumulated amortization of 227,051 and 222,052 at march 31, 2025 and december 31, 2024, respectively 374,606,000                                                                               
  preferred stock 0.01 par value per share, 30,000,000 shares authorized; 9,000,000 shares issued and outstanding, in the aggregate, in series a and series b at march 31, 2025 and december 31, 2024 225,000,000                                                                               
  common stock 0.01 par value per share, 220,000,000 shares authorized; 181,525,936 and 181,361,454 shares issued and outstanding at march 31, 2025 and december 31, 2024, respectively 1,815,000                                                                               
  exchangeable operating partnership units, aggregate redemption value of 80,890 and 81,076 at march 31, 2025 and december 31, 2024, respectively 40,584,000                                                                               
  cash, cash equivalents, and restricted cash, including 5,601 and 6,383 of restricted cash at december 31, 2024 and 2023, respectively  61,884,000                                                                              
  deferred leasing costs, less accumulated amortization of 131,080 and 124,107 at december 31, 2024 and 2023, respectively  79,911,000                                                                              
  acquired lease intangible assets, less accumulated amortization of 395,209 and 364,413 at december 31, 2024 and 2023, respectively  229,983,000                                                                              
  acquired lease intangible liabilities, less accumulated amortization of 222,052 and 211,067 at december 31, 2024 and 2023, respectively  364,608,000                                                                              
  preferred stock 0.01 par value per share, 30,000,000 shares authorized; 9,000,000 shares issued and outstanding, in the aggregate, in series a and series b at december 31, 2024 and 2023  225,000,000                                                                              
  common stock 0.01 par value per share, 220,000,000 shares authorized; 181,361,454 and 184,581,070 shares issued and outstanding at december 31, 2024 and 2023, respectively  1,814,000                                                                              
  accumulated other comprehensive gain  2,226,000                                                                              
  exchangeable operating partnership units, aggregate redemption value of 81,076 and 74,199 at december 31, 2024 and 2023, respectively  40,744,000                                                                              
  investments in sales-type lease   16,056,000 15,826,000 11,532,000 8,705,000 8,558,000                                                                         
  cash, cash equivalents, and restricted cash, including 4,822 and 6,383 of restricted cash at september 30, 2024 and december 31, 2023, respectively   114,831,000                                                                             
  deferred leasing costs, less accumulated amortization of 128,881 and 124,107 at september 30, 2024 and december 31, 2023, respectively   78,206,000                                                                             
  acquired lease intangible assets, less accumulated amortization of 384,600 and 364,413 at september 30, 2024 and december 31, 2023, respectively   242,529,000                                                                             
  acquired lease intangible liabilities, less accumulated amortization of 214,684 and 211,067 at september 30, 2024 and december 31, 2023, respectively   372,627,000                                                                             
  preferred stock 0.01 par value per share, 30,000,000 shares authorized; 9,000,000 shares issued and outstanding, in the aggregate, in series a and series b at september 30, 2024 and december 31, 2023 with liquidation preference of 25 per share   225,000,000                                                                             
  common stock 0.01 par value per share, 220,000,000 shares authorized; 181,502,569 and 184,581,070 shares issued and outstanding at september 30, 2024 and december 31, 2023, respectively   1,815,000                                                                             
  accumulated other comprehensive loss   -5,374,000          -1,764,000 -10,227,000 -12,618,000 -13,658,000 -25,135,000 -25,531,000 -11,997,000 -15,804,000 -14,086,000 -6,096,000 -927,000    -6,289,000 -14,141,000 -16,435,000 -15,791,000 -18,346,000 -35,739,000 -80,038,000 -72,893,000 -58,693,000 -62,307,000 -48,799,000 -69,277,000 -57,748,000 -33,963,000 -36,412,000 -28,599,000 -17,404,000 -28,430,000 -31,319,000 -51,983,000 -57,715,000 -64,378,000 -66,731,000 -69,083,000 -71,429,000 -73,800,000 -76,162,000 -78,523,000 -80,885,000 -83,243,000 -73,950,000 -55,674,000  -64,969,000 -54,399,000 -68,585,000 -91,465,000       -10,799,000 -13,317,000 -13,334,000 -581,000 -8,552,000 -11,692,000 -12,019,000    
  exchangeable operating partnership units, aggregate redemption value of 79,212 and 74,199 at september 30, 2024 and december 31, 2023, respectively   40,890,000                                                                             
  cash, cash equivalents, and restricted cash, including 6,109 and 6,383 of restricted cash at june 30, 2024 and december 31, 2023, respectively    79,923,000                                                                            
  deferred leasing costs, less accumulated amortization of 126,867 and 124,107 at june 30, 2024 and december 31, 2023, respectively    77,836,000                                                                            
  acquired lease intangible assets, less accumulated amortization of 374,411 and 364,413 at june 30, 2024 and december 31, 2023, respectively    256,639,000                                                                            
  acquired lease intangible liabilities, less accumulated amortization of 208,900 and 211,067 at june 30, 2024 and december 31, 2023, respectively    380,505,000                                                                            
  preferred stock 0.01 par value per share, 30,000,000 shares authorized; 9,000,000 shares issued and outstanding, in the aggregate, in series a and series b at june 30, 2024 and december 31, 2023 with liquidation preference of 25 per share    225,000,000                                                                            
  common stock 0.01 par value per share, 220,000,000 shares authorized; 181,493,494 and 184,581,070 shares issued and outstanding at june 30, 2024 and december 31, 2023, respectively    1,815,000                                                                            
  exchangeable operating partnership units, aggregate redemption value of 68,390 and 74,199 at june 30, 2024 and december 31, 2023, respectively    40,738,000                                                                            
  cash, cash equivalents, and restricted cash, including 5,401 and 6,383 of restricted cash at march 31, 2024 and december 31, 2023, respectively     230,101,000                                                                           
  deferred leasing costs, less accumulated amortization of 125,643 and 124,107 at march 31, 2024 and december 31, 2023, respectively     77,484,000                                                                           
  acquired lease intangible assets, less accumulated amortization of 364,829 and 364,413 at march 31, 2024 and december 31, 2023, respectively     266,831,000                                                                           
  acquired lease intangible liabilities, less accumulated amortization of 202,474 and 211,067 at march 31, 2024 and december 31, 2023, respectively     389,908,000                                                                           
  preferred stock 0.01 par value per share, 30,000,000 shares authorized; 9,000,000 and shares issued and outstanding, in the aggregate, in series a and series b at march 31, 2024 and december 31, 2023 with liquidation preference of 25 per share     225,000,000                                                                           
  common stock 0.01 par value per share, 220,000,000 shares authorized; 184,774,486 and 184,581,070 shares issued and outstanding at march 31, 2024 and december 31, 2023, respectively     1,848,000                                                                           
  exchangeable operating partnership units, aggregate redemption value of 66,587 and 74,199 at march 31, 2024 and december 31, 2023, respectively     41,606,000                                                                           
  cash, cash equivalents, and restricted cash, including 6,383 and 2,310 of restricted cash at december 31, 2023 and 2022, respectively      91,354,000                                                                          
  deferred leasing costs, less accumulated amortization of 124,107 and 117,137 at december 31, 2023 and 2022, respectively      73,398,000                                                                          
  acquired lease intangible assets, less accumulated amortization of 364,413 and 338,053 at december 31, 2023 and 2022, respectively      283,375,000                                                                          
  acquired lease intangible liabilities, less accumulated amortization of 211,067 and 193,315 at december 31, 2023 and 2022, respectively      398,302,000                                                                          
  tenants’ security, escrow deposits and prepaid rent      78,052,000    70,242,000   60,895,000 62,352,000 53,269,000 55,904,000 50,251,000 48,573,000 58,865,000 53,227,000 45,527,000 46,923,000 57,750,000 43,988,000 49,124,000 48,428,000  46,351,000 50,126,000 41,136,000  28,239,000 26,974,000 28,217,000  24,726,000                                            
  shareholders’ equity                                                                                
  preferred stock 0.01 par value per share, 30,000,000 shares authorized; 9,000,000 shares issued, in the aggregate, in series a and series b at december 31, 2023 with liquidation preferences of 25 per share and no shares authorized or issued at december 31, 2022      225,000,000                                                                          
  common stock 0.01 par value per share, 220,000,000 shares authorized; 184,581,070 and 171,124,593 shares issued at december 31, 2023 and 2022, respectively      1,846,000                                                                          
  total shareholders’ equity      7,032,687,000                                                                          
  noncontrolling interests                                                                                
  exchangeable operating partnership units, aggregate redemption value of 74,199 and 46,340 at december 31, 2023 and 2022, respectively      42,195,000                                                                          
  limited partners’ interests in consolidated partnerships      117,053,000    46,565,000   37,489,000 37,114,000 37,131,000 37,407,000 38,843,000 39,069,000 40,513,000 40,767,000 41,479,000 41,437,000 41,532,000 29,423,000 29,923,000 30,233,000 30,095,000 30,316,000 30,794,000 35,217,000 35,168,000 35,145,000 37,282,000 37,691,000 30,486,000 30,958,000 31,072,000 31,184,000 31,804,000 30,843,000 34,308,000 34,516,000 19,206,000 13,891,000 13,579,000 14,095,000 16,299,000 16,176,000 16,244,000 13,074,000 13,104,000 13,035,000 12,799,000 12,908,000  10,818,000 10,839,000 10,817,000                      
  cash, cash equivalents, and restricted cash, including 6,710 and 2,310 of restricted cash at september 30, 2023 and december 31, 2022, respectively       81,070,000                                                                         
  deferred leasing costs, less accumulated amortization of 122,530 and 117,137 at september 30, 2023 and december 31, 2022, respectively       71,551,000                                                                         
  acquired lease intangible assets, less accumulated amortization of 351,118 and 338,053 at september 30, 2023 and december 31, 2022, respectively       295,347,000                                                                         
  acquired lease intangible liabilities, less accumulated amortization of 205,096 and 193,315 at september 30, 2023 and december 31, 2022, respectively       396,423,000                                                                         
  series a and series b preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 9,000,000 shares issued at september 30, 2023 with liquidation preferences of 25 per share and no shares authorized or issued at december 30, 2022       225,000,000                                                                         
  common stock; 0.01 par value per share, 220,000,000 shares authorized; 184,576,090 and 171,124,593 shares issued at september 30, 2023 and december 31, 2022, respectively       1,846,000                                                                         
  exchangeable operating partnership units, aggregate redemption value of 64,005 and 46,340 at september 30, 2023 and december 31, 2022, respectively       53,914,000                                                                         
  cash, cash equivalents, and restricted cash, including 3,259 and 2,310 of restricted cash at june 30, 2023 and december 31, 2022, respectively        43,108,000                                                                        
  deferred leasing costs, less accumulated amortization of 120,436 and 117,137 at june 30, 2023 and december 31, 2022, respectively        69,788,000                                                                        
  acquired lease intangible assets, less accumulated amortization of 345,131 and 338,053 at june 30, 2023 and december 31, 2022, respectively        178,849,000                                                                        
  acquired lease intangible liabilities, less accumulated amortization of 201,440 and 193,315 at june 30, 2023 and december 31, 2022, respectively        336,636,000                                                                        
  common stock; 0.01 par value per share, 220,000,000 shares authorized; 170,998,004 and 171,124,593 shares issued at june 30, 2023 and december 31, 2022, respectively        1,710,000                                                                        
  exchangeable operating partnership units, aggregate redemption value of 66,720 and 46,340 at june 30, 2023 and december 31, 2022, respectively        54,281,000                                                                        
  cash, cash equivalents, and restricted cash, including 2,955 and 2,310 of restricted cash at march 31, 2023 and december 31, 2022, respectively         68,143,000                                                                       
  deferred leasing costs, less accumulated amortization of 118,766 and 117,137 at march 31, 2023 and december 31, 2022, respectively         68,567,000                                                                       
  acquired lease intangible assets, less accumulated amortization of 344,460 and 338,053 at march 31, 2023 and december 31, 2022, respectively         188,636,000                                                                       
  acquired lease intangible liabilities, less accumulated amortization of 199,840 and 193,315 at march 31, 2023 and december 31, 2022, respectively         346,939,000                                                                       
  common stock; 0.01 par value per share, 220,000,000 shares authorized; 170,958,422 and 171,124,593 shares issued at march 31, 2023 and december 31, 2022, respectively         1,710,000                                                                       
  exchangeable operating partnership units, aggregate redemption value of 45,361 and 46,340 at march 31, 2023 and december 31, 2022, respectively         34,411,000                                                                       
  cash, cash equivalents, and restricted cash, including 2,310 and 1,930 of restricted cash at december 31, 2022 and 2021, respectively          68,776,000                                                                      
  deferred leasing costs, less accumulated amortization of 117,137 and 117,878 at december 31, 2022 and 2021, respectively          68,945,000                                                                      
  acquired lease intangible assets, less accumulated amortization of 338,053 and 312,186 at december 31, 2022 and 2021, respectively          197,745,000                                                                      
  acquired lease intangible liabilities, less accumulated amortization of 193,315 and 172,293 at december 31, 2022 and 2021, respectively          354,204,000                                                                      
  stockholders’ equity                                                                                
  common stock 0.01 par value per share, 220,000,000 shares authorized; 171,124,593 and 171,213,008 shares issued at december 31, 2022 and 2021, respectively          1,711,000                                                                      
  additional paid-in capital          7,877,152,000    7,883,458,000     7,654,930,000    7,672,517,000    7,873,104,000                                                     
  total stockholders’ equity          6,096,985,000   6,132,327,000 6,037,371,000 6,070,721,000 5,967,080,000 6,121,983,000 6,199,422,000 6,213,348,000 6,262,739,000 6,300,841,000 6,350,695,000 6,397,970,000 6,512,094,000 6,528,100,000 6,564,301,000 6,692,052,000 6,595,462,000 6,692,286,000 6,731,349,000 2,591,301,000 2,567,145,000 2,166,756,000 2,046,671,000 2,054,109,000 1,879,026,000 1,880,735,000 1,869,654,000 1,906,592,000 1,845,221,000 1,785,911,000 1,808,352,000 1,843,354,000 1,824,666,000 1,823,618,000 1,762,794,000 1,730,765,000 1,799,337,000 1,802,396,000 1,832,530,000 1,808,355,000 1,836,198,000 1,847,599,000 1,869,232,000  1,770,576,000 1,805,384,000 1,845,687,000 1,875,167,000 1,832,797,000 1,961,978,000 1,688,569,000 1,696,085,000 1,839,463,000 1,837,417,000  1,870,386,000 1,859,076,000 1,879,009,000 1,860,187,000 1,853,317,000 1,824,713,000 1,829,320,000 1,818,763,000 1,788,825,000 1,776,907,000 1,503,972,000 1,501,708,000 1,498,717,000 
  exchangeable operating partnership units, aggregate redemption value of 46,340 and 56,844 at december 31, 2022 and 2021, respectively          34,489,000                                                                      
  cash, cash equivalents, and restricted cash, including 3,752 and 1,930 of restricted cash at september 30, 2022 and december 31, 2021, respectively           154,984,000                                                                     
  deferred leasing costs, less accumulated amortization of 122,690 and 117,878 at september 30, 2022 and december 31, 2021, respectively           69,091,000                                                                     
  acquired lease intangible assets, less accumulated amortization of 332,866 and 312,186 at september 30, 2022 and december 31, 2021, respectively           204,097,000                                                                     
  acquired lease intangible liabilities, less accumulated amortization of 186,515 and 172,293 at september 30, 2022 and december 31, 2021, respectively           350,531,000                                                                     
  stockholders' equity:                                                                                
  common stock           1,711,000 1,711,000 1,714,000  1,712,000 1,699,000 1,697,000 1,696,000  1,676,000 1,676,000 1,675,000  1,694,000 1,694,000 1,694,000  1,701,000 1,701,000 1,701,000  1,045,000 995,000 976,000  942,000 943,000 943,000  932,000 923,000 923,000  923,000                                    
  total stockholders' equity           6,115,883,000 6,125,033,000                                           1,701,435,000           1,840,345,000              
  exchangeable operating partnership units, aggregate redemption value of 39,926 and 56,844 at september 30, 2022 and december 31, 2021, respectively           34,554,000                                                                     
  cash, cash equivalents, and restricted cash, including 3,128 and 1,930 of restricted cash at june 30, 2022 and december 31, 2021, respectively            121,190,000                                                                    
  deferred leasing costs, less accumulated amortization of 120,650 and 117,878 at june 30, 2022 and december 31, 2021, respectively            65,607,000                                                                    
  acquired lease intangible assets, less accumulated amortization of 325,131 and 312,186 at june 30, 2022 and december 31, 2021, respectively            214,264,000                                                                    
  acquired lease intangible liabilities, less accumulated amortization of 180,082 and 172,293 at june 30, 2022 and december 31, 2021, respectively            357,581,000                                                                    
  exchangeable operating partnership units, aggregate redemption value of 43,974 and 56,844 at june 30, 2022 and december 31, 2021, respectively            34,611,000                                                                    
  cash, cash equivalents, and restricted cash, including 2,749 and 1,930 of restricted cash at march 31, 2022 and december 31, 2021, respectively             178,730,000                                                                   
  deferred leasing costs, less accumulated amortization of 118,572 and 117,878 at march 31, 2022 and december 31, 2021, respectively             64,954,000                                                                   
  acquired lease intangible assets, less accumulated amortization of 316,632 and 312,186 at march 31, 2022 and december 31, 2021, respectively             205,333,000                                                                   
  acquired lease intangible liabilities, less accumulated amortization of 173,281 and 172,293 at march 31, 2022 and december 31, 2021, respectively             362,890,000                                                                   
  stockholders’ equity:                                                                                
  exchangeable operating partnership units, aggregate redemption value of 54,222 and 56,844 at march 31, 2022 and december 31, 2021, respectively             35,876,000                                                                   
  cash, cash equivalents, and restricted cash, including 1,930 and 2,377 of restricted cash at december 31, 2021 and 2020, respectively              95,027,000                                                                  
  deferred leasing costs, less accumulated amortization of 117,878 and 113,959 at december 31, 2021 and 2020, respectively              65,741,000                                                                  
  acquired lease intangible assets, less accumulated amortization of 312,186 and 284,880 at december 31, 2021 and 2020, respectively              212,707,000                                                                  
  unsecured credit facilities                 264,531,000 969,457,000 484,383,000 449,309,000 683,970,000 673,852,000 708,734,000 708,616,000 713,498,000 563,380,000 623,262,000 578,144,000 563,031,000 658,024,000 278,495,000 263,421,000 309,585,000 164,550,000 165,000,000 215,000,000 120,000,000 105,000,000 75,000,000 75,000,000 85,000,000 145,000,000 75,000,000 100,000,000 125,000,000 145,000,000 170,000,000 65,000,000 305,000,000 275,000,000     10,000,000 110,000,000    227,667,000 227,667,000 367,667,000 297,667,000 297,667,000 334,667,000 309,667,000              
  acquired lease intangible liabilities, less accumulated amortization of 172,293 and 145,966 at december 31, 2021 and 2020, respectively              363,276,000                                                                  
  common stock 0.01 par value per share, 220,000,000 shares authorized; 171,213,008 and 169,680,138 shares issued at december 31, 2021 and 2020, respectively              1,712,000                                                                  
  exchangeable operating partnership units, aggregate redemption value of 56,844 and 34,878 at december 31, 2021 and 2020, respectively              35,447,000                                                                  
  cash, cash equivalents, and restricted cash, including 3,288 and 2,377 of restricted cash at september 30, 2021 and december 31, 2020, respectively               362,685,000                                                                 
  deferred leasing costs, less accumulated amortization of 116,737 and 113,959 at september 30, 2021 and december 31, 2020, respectively               68,049,000                                                                 
  acquired lease intangible assets, less accumulated amortization of 305,744 and 284,880 at september 30, 2021 and december 31, 2020, respectively               173,926,000                                                                 
  acquired lease intangible liabilities, less accumulated amortization of 166,590 and 145,966 at september 30, 2021 and december 31, 2020, respectively               361,411,000                                                                 
  exchangeable operating partnership units, aggregate redemption value of 51,174 and 34,878 at september 30, 2021 and december 31, 2020, respectively               35,612,000                                                                 
  cash, cash equivalents, and restricted cash, including 2,580 and 2,377 of restricted cash at june 30, 2021 and december 31, 2020, respectively                286,613,000                                                                
  deferred leasing costs, less accumulated amortization of 115,396 and 113,959 at june 30, 2021 and december 31, 2020, respectively                66,604,000                                                                
  acquired lease intangible assets, less accumulated amortization of 298,377 and 284,880 at june 30, 2021 and december 31, 2020, respectively                169,119,000                                                                
  acquired lease intangible liabilities, less accumulated amortization of 159,554 and 145,966 at june 30, 2021 and december 31, 2020, respectively                361,959,000                                                                
  exchangeable operating partnership units, aggregate redemption value of 48,696 and 34,878 at june 30, 2021 and december 31, 2020, respectively                35,544,000                                                                
  cash, cash equivalents, and restricted cash, including 3,933 and 2,542 of restricted cash at june 30, 2020 and december 31, 2019, respectively                 587,358,000                                                               
  deferred leasing costs, less accumulated amortization of 112,589 and 108,381 at june 30, 2020 and december 31, 2019, respectively                 73,340,000                                                               
  acquired lease intangible assets, less accumulated amortization of 276,169 and 259,310 at june 30, 2020 and december 31, 2019, respectively                 215,376,000                                                               
  acquired lease intangible liabilities, less accumulated amortization of 138,335 and 131,676 at june 30, 2020 and december 31, 2019, respectively                 400,533,000                                                               
  exchangeable operating partnership units, aggregate redemption value of 35,108 and 47,092 at june 30, 2020 and december 31, 2019, respectively                 36,376,000                                                               
  cash, cash equivalents and restricted cash, including 3,595 and 2,542 of restricted cash at march 31, 2020 and december 31, 2019, respectively                  736,845,000                                                              
  deferred leasing costs, less accumulated amortization of 110,158 and 108,381 at march 31, 2020 and december 31, 2019, respectively                  77,100,000                                                              
  acquired lease intangible assets, less accumulated amortization of 268,063 and 259,310 at march 31, 2020 and december 31, 2019, respectively                  228,819,000                                                              
  acquired lease intangible liabilities, less accumulated amortization of 144,682 and 131,676 at march 31, 2020 and december 31, 2019, respectively                  413,108,000                                                              
  exchangeable operating partnership units, aggregate redemption value of 29,401 and 47,092 at march 31, 2020 and december 31, 2019, respectively                  36,744,000                                                              
  cash, cash equivalents, and restricted cash, including 2,542 and 2,658 of restricted cash at december 31, 2019 and 2018, respectively                   115,562,000                                                             
  deferred leasing costs, less accumulated amortization of 108,381 and 101,093 at december 31, 2019 and 2018, respectively                   76,798,000                                                             
  acquired lease intangible assets, less accumulated amortization of 259,310 and 219,689 at december 31, 2019 and 2018, respectively                   242,822,000                                                             
  acquired lease intangible liabilities, less accumulated amortization of 131,676 and 92,746 at december 31, 2019 and 2018, respectively                   427,260,000                                                             
  common stock 0.01 par value per share, 220,000,000 shares authorized; 167,571,218 and 167,904,593 shares issued at december 31, 2019 and 2018, respectively                   1,676,000                                                             
  exchangeable operating partnership units, aggregate redemption value of 47,092 and 20,532 at december 31, 2019 and 2018, respectively                   36,100,000                                                             
  real estate investments                    9,418,276,000 9,221,776,000 9,269,377,000                                                          
  cash, cash equivalents and restricted cash                    47,461,000 37,364,000 42,784,000                                                          
  deferred leasing costs, less accumulated amortization of 107,737 and 101,093 at september 30, 2019 and december 31, 2018, respectively                    79,729,000                                                            
  acquired lease intangible assets, less accumulated amortization of 247,639 and 219,689 at september 30, 2019 and december 31, 2018, respectively                    264,681,000                                                            
  acquired lease intangible liabilities, less accumulated amortization of 119,539 and 92,746 at september 30, 2019 and december 31, 2018, respectively                    449,498,000                                                            
  exchangeable operating partnership units, aggregate redemption value of 51,870 and 20,532 at september 30, 2019 and december 31, 2018, respectively                    36,341,000                                                            
  deferred leasing costs, less accumulated amortization of 104,972 and 101,093 at june 30, 2019 and december 31, 2018, respectively                     81,183,000                                                           
  acquired lease intangible assets, less accumulated amortization of 237,924 and 219,689 at june 30, 2019 and december 31, 2018, respectively                     262,553,000                                                           
  acquired lease intangible liabilities, less accumulated amortization of 106,286 and 92,746 at june 30, 2019 and december 31, 2018, respectively                     457,667,000                                                           
  exchangeable operating partnership units, aggregate redemption value of 23,352 and 20,532 at june 30, 2019 and december 31, 2018, respectively                     10,528,000                                                           
  deferred leasing costs, less accumulated amortization of 102,141 and 101,093 at march 31, 2019 and december 31, 2018, respectively                      82,477,000                                                          
  acquired lease intangible assets, less accumulated amortization of 225,693 and 219,689 at march 31, 2019 and december 31, 2018, respectively                      280,613,000                                                          
  acquired lease intangible liabilities, less accumulated amortization of 99,163 and 92,746 at march 31, 2019 and december 31, 2018, respectively                      475,065,000                                                          
  exchangeable operating partnership units, aggregate redemption value of 23,615 and 20,532 at march 31, 2019 and december 31, 2018, respectively                      10,641,000                                                          
  cash and cash equivalents                       42,532,000 40,365,000 37,151,000 87,904,000 45,370,000 23,543,000 97,266,000 36,855,000 13,256,000 40,902,000 24,939,000 27,137,000 36,856,000 23,880,000 27,114,000 36,489,000 113,776,000 100,708,000 36,736,000 35,159,000 80,684,000 62,702,000 59,143,000 22,402,000 22,349,000 21,350,000 23,030,000 27,115,000 11,402,000 21,195,000 18,408,000 65,764,000 22,460,000 38,838,000 106,433,000 119,538,000 99,477,000 173,798,000 126,792,000 24,669,000 21,533,000 25,777,000 41,604,000 29,212,000 18,668,000 33,571,000 55,095,000 29,164,000 34,046,000 38,360,000 36,594,000 88,056,000 42,458,000 31,232,000 26,252,000 53,591,000 95,320,000 
  restricted cash                       2,658,000 4,121,000 6,089,000 5,732,000 4,011,000 7,098,000 7,435,000 7,987,000 4,623,000 4,005,000 3,505,000 3,893,000 3,767,000 5,142,000 6,726,000 6,590,000 8,013,000 9,339,000 8,912,000 9,192,000 9,520,000 5,288,000 5,354,000 6,090,000 6,472,000 6,133,000 6,075,000 6,406,000 6,050,000                             
  deferred leasing costs, less accumulated amortization of 101,093 and 93,291 at december 31, 2018 and 2017, respectively                       84,983,000                                                         
  acquired lease intangible assets, less accumulated amortization of 219,689 and 148,280 at december 31, 2018 and 2017, respectively                       387,069,000                                                         
  acquired lease intangible liabilities, less accumulated amortization of 92,746 and 56,550 at december 31, 2018 and 2017, respectively                       496,726,000                                                         
  common stock 0.01 par value per share, 220,000,000 shares authorized; 167,904,593 and 171,364,908 shares issued at december 31, 2018 and 2017, respectively                       1,679,000                                                         
  exchangeable operating partnership units, aggregate redemption value of 20,532 and 24,206 at december 31, 2018 and 2017, respectively                       10,666,000                                                         
  see accompanying notes to consolidated financial statements.                                                                                
  real estate investments at cost:                                                                                
  land, building and improvements                        10,854,283,000 10,752,552,000 10,768,379,000                                                      
  properties in development                        36,707,000 164,001,000 179,123,000 314,391,000 433,707,000 373,962,000 292,480,000 180,878,000 157,537,000 137,562,000 182,598,000 217,036,000 187,240,000 216,408,000 247,503,000 239,538,000 273,710,000 225,793,000 212,783,000 186,450,000 305,249,000 246,990,000 208,432,000 192,067,000 220,753,000 249,509,000 250,342,000 224,077,000 521,945,000 499,584,000 614,612,000 610,932,000 687,428,000 714,701,000 816,328,000 920,427,000 963,467,000 1,051,514,000 1,077,984,000 1,078,885,000 1,075,796,000 1,008,235,000 928,083,000 905,929,000 895,554,000 929,425,000 747,163,000 615,450,000 682,646,000 562,489,000 487,717,000 413,677,000 410,764,000 378,701,000 379,313,000 426,216,000 
  tenant and other receivables, net of uncollectible reserves of 14,332 and 12,728 at september 30, 2018 and december 31, 2017, respectively                        160,709,000                                                        
  deferred leasing costs, less accumulated amortization of 98,829 and 93,291 at september 30, 2018 and december 31, 2017, respectively                        85,292,000                                                        
  acquired lease intangible assets, less accumulated amortization of 206,378 and 148,280 at september 30, 2018 and december 31, 2017, respectively                        412,653,000                                                        
  acquired lease intangible liabilities, less accumulated amortization of 84,435 and 56,550 at september 30, 2018 and december 31, 2017, respectively                        507,341,000                                                        
  additional paid in capital                        7,756,215,000 7,751,375,000 7,746,427,000  7,779,103,000 7,772,791,000 7,768,794,000 3,294,923,000 3,291,602,000 2,888,583,000 2,748,904,000 2,742,508,000 2,542,791,000 2,539,008,000 2,536,471,000 2,540,153,000 2,484,460,000 2,431,928,000 2,428,166,000 2,426,477,000 2,422,466,000 2,416,632,000 2,365,607,000 2,312,310,000 2,308,681,000 2,284,464,000 2,280,781,000 2,281,817,000 2,278,753,000 2,259,745,000 2,256,674,000 2,038,006,000 2,035,372,000 2,033,313,000 2,024,244,000 2,022,670,000 2,094,850,000 2,092,351,000 1,779,039,000 1,778,265,000 1,781,487,000 1,775,722,000 1,769,327,000 1,766,280,000 1,758,700,000 1,750,132,000 1,742,188,000 1,744,201,000 1,736,042,000 1,726,383,000 1,715,120,000 1,713,620,000 1,708,138,000 1,505,278,000 1,497,124,000 1,494,312,000 
  exchangeable operating partnership units, aggregate redemption value of 22,628 and 24,206 at september 30, 2018 and december 31, 2017, respectively                        10,726,000                                                        
  tenant and other receivables, net of allowance for doubtful accounts and straight-line rent reserves of 14,790 and 12,728 at june 30, 2018 and december 31, 2017, respectively                         155,540,000                                                       
  deferred leasing costs, less accumulated amortization of 97,107 and 93,291 at june 30, 2018 and december 31, 2017, respectively                         83,686,000                                                       
  acquired lease intangible assets, less accumulated amortization of 188,246 and 148,280 at june 30, 2018 and december 31, 2017, respectively                         432,951,000                                                       
  acquired lease intangible liabilities, less accumulated amortization of 75,179 and 56,550 at june 30, 2018 and december 31, 2017, respectively                         517,018,000                                                       
  exchangeable operating partnership units, aggregate redemption value of 21,722 and 24,206 at june 30, 2018 and december 31, 2017, respectively                         10,765,000                                                       
  tenant and other receivables, net of allowance for doubtful accounts and straight-line rent reserves of 13,945 and 12,728 at march 31, 2018 and december 31, 2017, respectively                          159,587,000                                                      
  deferred leasing costs, less accumulated amortization of 96,192 and 93,291 at march 31, 2018 and december 31, 2017, respectively                          83,638,000                                                      
  acquired lease intangible assets, less accumulated amortization of 171,114 and 148,280 at march 31, 2018 and december 31, 2017, respectively                          455,589,000                                                      
  acquired lease intangible liabilities, less accumulated amortization of 68,123 and 56,550 at march 31, 2018 and december 31, 2017, respectively                          527,264,000                                                      
  exchangeable operating partnership units, aggregate redemption value of 20,637 and 24,206 at march 31, 2018 and december 31, 2017, respectively                          10,847,000                                                      
  real estate investments at cost                                                                                
  land                           4,667,744,000 4,578,145,000 4,690,171,000 4,760,963,000 1,660,424,000   1,435,619,000 1,432,468,000 1,431,612,000 1,405,931,000 1,386,126,000 1,380,211,000 1,323,452,000 1,318,518,000 1,315,900,000 1,249,779,000 1,175,815,000 1,193,500,000 1,228,920,000 1,215,659,000 1,212,308,000 1,276,966,000 1,264,492,000 1,273,606,000 1,167,152,000 1,168,160,000 1,094,816,000 1,093,700,000 1,071,961,000 1,058,214,000 1,021,059,000 975,861,000 994,637,000 1,001,137,000 974,244,000 923,062,000 939,851,000 995,976,000 986,700,000 968,859,000 942,792,000 876,241,000 843,384,000 862,851,000 829,285,000 858,210,000 853,078,000 853,275,000 827,058,000 817,591,000 826,266,000 806,207,000 
  buildings and improvements                           5,910,686,000 5,834,405,000 5,779,172,000 5,908,653,000 3,092,197,000 3,086,287,000 3,044,793,000 2,904,538,000 2,896,396,000 2,880,141,000 2,817,680,000 2,793,939,000 2,790,137,000 2,703,109,000 2,711,144,000 2,683,333,000 2,590,302,000 2,479,326,000 2,502,979,000 2,515,644,000 2,502,186,000 2,398,114,000 2,614,724,000 2,608,756,000 2,604,229,000 2,462,234,000 2,408,966,000 2,291,514,000 2,284,522,000 2,199,756,000 2,160,802,000 2,082,026,000 2,017,843,000 2,110,795,000 2,099,905,000 2,038,474,000 1,974,093,000 2,023,322,000 2,114,443,000 2,130,320,000 2,090,497,000 2,048,713,000 1,949,142,000 1,923,384,000 1,963,634,000 1,953,135,000 1,981,437,000 1,934,326,000 1,926,297,000 1,921,703,000 1,927,265,000 1,944,493,000 1,915,655,000 
  deferred leasing costs, less accumulated amortization of 93,291 and 83,529 at december 31, 2017 and 2016, respectively                           80,044,000                                                     
  acquired lease intangible assets, less accumulated amortization of 148,280 and 56,695 at december 31, 2017 and 2016, respectively                           478,826,000                                                     
  acquired lease intangible liabilities, less accumulated amortization of 56,550 and 23,538 at december 31, 2017 and 2016, respectively                           537,401,000                                                     
  tenants’ security and escrow deposits and prepaid rent                           46,013,000    28,868,000    29,427,000  27,161,000 27,045,000 25,991,000 24,888,000 23,540,000 25,847,000 23,911,000 22,454,000 14,229,000 14,618,000 18,146,000 14,053,000 20,929,000 19,757,000 20,416,000 19,240,000                            
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at december 31, 2016, with liquidation preferences of 25 per share                                                                                
  common stock 0.01 par value per share, 220,000,000 and 150,000,000 shares authorized; 171,364,908 and 104,497,286 shares issued at december 31, 2017 and 2016, respectively                           1,714,000                                                     
  exchangeable operating partnership units, aggregate redemption value of 24,206 and 10,630 at december 31, 2017 and 2016, respectively                           10,907,000                                                     
  tenant and other receivables, net of allowance for doubtful accounts and straight-line rent reserves of 12,279 and 9,021 at september 30, 2017 and december 31, 2016, respectively                            143,153,000                                                    
  deferred leasing costs, less accumulated amortization of 91,213 and 83,529 at september 30, 2017 and december 31, 2016, respectively                            71,826,000                                                    
  acquired lease intangible assets, less accumulated amortization of 123,662 and 56,695 at september 30, 2017 and december 31, 2016, respectively                            508,868,000                                                    
  acquired lease intangible liabilities, less accumulated amortization of 49,968 and 23,538 at september 30, 2017 and december 31, 2016, respectively                            637,217,000                                                    
  exchangeable operating partnership units, aggregate redemption value of 21,708 and 10,630 at september 30, 2017 and december 31, 2016, respectively                            10,906,000                                                    
  tenant and other receivables, net of allowance for doubtful accounts and straight-line rent reserves of 10,898 and 9,021 at june 30, 2017 and december 31, 2016, respectively                             125,372,000                                                   
  deferred leasing costs, less accumulated amortization of 88,612 and 83,529 at june 30, 2017 and december 31, 2016, respectively                             70,653,000                                                   
  acquired lease intangible assets, less accumulated amortization of 98,447 and 56,695 at june 30, 2017 and december 31, 2016, respectively                             540,119,000                                                   
  trading securities held in trust                             29,839,000 29,025,000                                                  
  acquired lease intangible liabilities, less accumulated amortization of 39,696 and 23,538 at june 30, 2017 and december 31, 2016, respectively                             653,695,000                                                   
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 3,000,000 series 7 shares issued and outstanding at june 30, 2017, and 13,000,000 series 6 and 7 shares issued and outstanding at december 31, 2016, with liquidation preferences of 25 per share                             75,000,000                                                   
  exchangeable operating partnership units, aggregate redemption value of 21,918 and 10,630 at june 30, 2017 and december 31, 2016, respectively                             10,955,000                                                   
  tenant and other receivables, net of allowance for doubtful accounts and straight-line rent reserves of 9,577 and 9,021 at march 31, 2017 and december 31, 2016, respectively                              119,843,000                                                  
  deferred leasing costs, less accumulated amortization of 85,971 and 83,529 at march 31, 2017 and december 31, 2016, respectively                              68,299,000                                                  
  acquired lease intangible assets, less accumulated amortization of 69,324 and 56,695 at march 31, 2017 and december 31, 2016, respectively                              606,707,000                                                  
  acquired lease intangible liabilities, less accumulated amortization of 28,689 and 23,538 at march 31, 2017 and december 31, 2016, respectively                              680,469,000                                                  
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 3,000,000 series 7 shares issued and outstanding at march 31, 2017, and 13,000,000 series 6 and 7 shares issued and outstanding at december 31, 2016, with liquidation preferences of 25 per share                              75,000,000                                                  
  exchangeable operating partnership units, aggregate redemption value of 10,235 and 10,630 at march 31, 2017 and december 31, 2016, respectively                              -2,063,000                                                  
  deferred leasing costs, less accumulated amortization of 83,529 and 76,823 at december 31, 2016 and 2015, respectively                               69,000,000                                                 
  acquired lease intangible assets, less accumulated amortization of 56,695 and 45,639 at december 31, 2016 and 2015, respectively                               118,831,000                                                 
  trading securities held in trust, at fair value                               28,588,000 29,280,000 29,939,000 29,615,000 29,093,000 28,291,000 29,530,000 29,595,000 28,134,000 27,365,000 27,604,000 26,976,000 26,681,000 25,421,000 24,457,000 24,495,000 23,429,000 23,208,000 22,455,000 23,411,000 21,713,000 20,683,000 23,285,000 21,661,000                          
  acquired lease intangible liabilities, less accumulated amortization of 23,538 and 17,555 at december 31, 2016 and 2015, respectively                               54,180,000                                                 
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at december 31, 2016 and 2015, with liquidation preferences of 25 per share                               325,000,000                                                 
  common stock 0.01 par value per share,150,000,000 shares authorized; 104,497,286 and 97,212,638 shares issued at december 31, 2016 and 2015, respectively                               1,045,000                                                 
  exchangeable operating partnership units, aggregate redemption value of 10,630 and 10,502 at december 31, 2016 and 2015, respectively                               -1,967,000                                                 
  land, including amounts held for future development                                1,654,389,000 1,639,958,000                                               
  accounts receivable                                24,816,000 27,765,000 25,702,000 32,292,000 24,642,000 25,506,000 27,293,000 30,999,000 25,719,000 33,510,000 32,781,000 26,319,000 23,379,000 21,824,000 24,589,000 26,601,000 28,220,000 37,681,000 42,338,000 37,733,000 29,243,000 27,301,000 26,597,000 36,600,000 37,012,000 31,878,000 31,232,000 40,871,000 35,931,000                    
  straight-line rent receivable, net of reserve of 3,688 and 1,365 at september 30, 2016 and december 31, 2015, respectively                                67,931,000                                                
  notes receivable                                10,480,000 10,480,000 10,487,000 10,480,000 11,314,000 12,281,000 12,169,000 12,132,000 12,132,000 11,917,000 11,938,000 11,960,000 26,128,000 18,502,000 19,727,000 23,751,000 23,777,000 23,865,000 23,883,000 35,784,000 35,931,000 35,931,000 35,931,000 35,931,000 36,814,000 36,814,000 36,814,000 37,753,000 26,341,000 27,988,000 36,928,000 31,438,000 55,264,000 20,298,000 32,413,000 44,543,000 20,337,000 19,961,000 19,979,000 19,988,000 21,916,000 41,156,000 34,284,000 46,473,000 21,895,000 22,715,000 23,252,000 25,646,000 
  deferred leasing costs, less accumulated amortization of 82,277 and 76,823 at september 30, 2016 and december 31, 2015, respectively                                68,455,000                                                
  acquired lease intangible assets, less accumulated amortization of 53,878 and 45,639 at september 30, 2016 and december 31, 2015, respectively                                122,738,000                                                
  acquired lease intangible liabilities, less accumulated accretion of 22,067 and 17,555 at september 30, 2016 and december 31, 2015, respectively                                56,455,000                                                
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at september 30, 2016 and december 31, 2015, with liquidation preferences of 25 per share                                325,000,000                                                
  exchangeable operating partnership units, aggregate redemption value of 11,947 and 10,502 at september 30, 2016 and december 31, 2015, respectively                                -2,006,000                                                
  straight-line rent receivable, net of reserve of 2,961 and 1,365 at june 30, 2016 and december 31, 2015, respectively                                 66,291,000                                               
  deferred leasing costs, less accumulated amortization of 80,816 and 76,823 at june 30, 2016 and december 31, 2015, respectively                                 68,297,000                                               
  acquired lease intangible assets, less accumulated amortization of 50,553 and 45,639 at june 30, 2016 and december 31, 2015, respectively                                 124,325,000                                               
  acquired lease intangible liabilities, less accumulated accretion of 20,240 and 17,555 at june 30, 2016 and december 31, 2015, respectively                                 57,776,000                                               
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at june 30, 2016 and december 31, 2015, with liquidation preferences of 25 per share                                 325,000,000                                               
  exchangeable operating partnership units, aggregate redemption value of 12,909 and 10,502 at june 30, 2016 and december 31, 2015, respectively                                 -2,013,000                                               
  straight-line rent receivable, net of reserve of 1,421 and 1,365 at march 31, 2016 and december 31, 2015, respectively                                  65,067,000                                              
  deferred leasing costs, less accumulated amortization of 78,852 and 76,823 at march 31, 2016 and december 31, 2015, respectively                                  69,200,000                                              
  acquired lease intangible assets, less accumulated amortization of 47,470 and 45,639 at march 31, 2016 and december 31, 2015, respectively                                  112,513,000                                              
  acquired lease intangible liabilities, less accumulated accretion of 18,603 and 17,555 at march 31, 2016 and december 31, 2015, respectively                                  43,751,000                                              
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at march 31, 2016 and december 31, 2015, with liquidation preferences of 25 per share                                  325,000,000                                              
  exchangeable operating partnership units, aggregate redemption value of 11,540 and 10,502 at march 31, 2016 and december 31, 2015, respectively                                  -1,989,000                                              
  straight-line rent receivable, net of reserve of 1,365 and 652 at december 31, 2015 and 2014, respectively                                   63,392,000                                             
  deferred costs, less accumulated amortization of 88,694 and 81,822 at december 31, 2015 and 2014, respectively                                   79,619,000                                             
  acquired lease intangible assets, less accumulated amortization of 45,639 and 36,112 at december 31, 2015 and 2014, respectively                                   105,380,000                                             
  acquired lease intangible liabilities, less accumulated accretion of 17,555 and 13,993 at december 31, 2015 and 2014, respectively                                   42,034,000                                             
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at december 31, 2015 and december 31, 2014, with liquidation preferences of 25 per share                                   325,000,000                                             
  common stock 0.01 par value per share,150,000,000 shares authorized; 97,212,638 and 94,108,061 shares issued at december 31, 2015 and 2014, respectively                                   972,000                                             
  exchangeable operating partnership units, aggregate redemption value of 10,502 and 9,833 at december 31, 2015 and 2014, respectively                                   -1,975,000                                             
  straight-line rent receivable, net of reserve of 1,176 and 652 at september 30, 2015 and december 31, 2014, respectively                                    61,435,000                                            
  deferred costs, less accumulated amortization of 85,591 and 81,822 at september 30, 2015 and december 31, 2014, respectively                                    77,599,000                                            
  acquired lease intangible assets, less accumulated amortization of 43,350 and 36,112 at september 30, 2015 and december 31, 2014, respectively                                    108,400,000                                            
  acquired lease intangible liabilities, less accumulated accretion of 16,689 and 13,993 at september 30, 2015 and december 31, 2014, respectively                                    43,161,000                                            
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at september 30, 2015 and december 31, 2014, with liquidation preferences of 25 per share                                    325,000,000                                            
  exchangeable operating partnership units, aggregate redemption value of 9,582 and 9,833 at september 30, 2015 and december 31, 2014, respectively                                    -1,940,000                                            
  operating properties held for sale                                     29,017,000 18,219,000  12,203,000    10,607,000 15,961,000           8,483,000   19,647,000 18,441,000 37,329,000 56,913,000 66,447,000 33,538,000 26,164,000   7,904,000 19,623,000 74,695,000 25,608,000 27,366,000 17,424,000  36,567,000 31,210,000 24,473,000 15,910,000 4,916,000 
  straight-line rent receivable, net of reserve of 767 and 652 at june 30, 2015 and december 31, 2014, respectively                                     59,168,000                                           
  deferred costs, less accumulated amortization of 82,561 and 81,822 at june 30, 2015 and december 31, 2014, respectively                                     74,978,000                                           
  acquired lease intangible assets, less accumulated amortization of 41,058 and 36,112 at june 30, 2015 and december 31, 2014, respectively                                     46,737,000                                           
  acquired lease intangible liabilities, less accumulated accretion of 15,718 and 13,993 at june 30, 2015 and december 31, 2014, respectively                                     30,125,000                                           
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at june 30, 2015 and december 31, 2014, with liquidation preferences of 25 per share                                     325,000,000                                           
  exchangeable operating partnership units, aggregate redemption value of 9,093 and 9,833 at june 30, 2015 and december 31, 2014, respectively                                     -1,940,000                                           
  straight-line rent receivable, net of reserve of 685 and 652 at march 31, 2015 and december 31, 2014, respectively                                      57,554,000                                          
  deferred costs, less accumulated amortization of 84,728 and 81,822 at march 31, 2015 and december 31, 2014, respectively                                      70,018,000                                          
  acquired lease intangible assets, less accumulated amortization of 38,670 and 36,112 at march 31, 2015 and december 31, 2014, respectively                                      49,363,000                                          
  acquired lease intangible liabilities, less accumulated accretion of 14,930 and 13,993 at march 31, 2015 and december 31, 2014, respectively                                      31,087,000                                          
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at march 31, 2015 and december 31, 2014, with liquidation preferences of 25 per share                                      325,000,000                                          
  exchangeable operating partnership units, aggregate redemption value of 10,490 and 9,833 at march 31, 2015 and december 31, 2014, respectively                                      -1,959,000                                          
  straight-line rent receivable, net of reserve of 652 and 547 at december 31, 2014 and 2013, respectively                                       55,768,000                                         
  deferred costs, less accumulated amortization of 81,822 and 73,231 at december 31, 2014 and 2013, respectively                                       71,502,000                                         
  acquired lease intangible assets, less accumulated amortization of 36,112 and 25,591 at december 31, 2014 and 2013, respectively                                       52,365,000                                         
  acquired lease intangible liabilities, less accumulated accretion of 13,993 and 10,102 at december 31, 2014 and 2013, respectively                                       32,143,000                                         
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at december 31, 2014 and december 31, 2013, with liquidation preferences of 25 per share                                       325,000,000                                         
  common stock 0.01 par value per share,150,000,000 shares authorized; 94,108,061 and 92,333,161 shares issued at december 31, 2014 and 2013, respectively                                       941,000                                         
  exchangeable operating partnership units, aggregate redemption value of 9,833 and 7,676 at december 31, 2014 and 2013, respectively                                       -1,914,000                                         
  straight-line rent receivable, net of reserve of 509 and 547 at september 30, 2014 and december 31, 2013, respectively                                        54,947,000                                        
  deferred costs, less accumulated amortization of 79,504 and 73,231 at september 30, 2014 and december 31, 2013, respectively                                        72,559,000                                        
  acquired lease intangible assets, less accumulated amortization of 35,505 and 25,591 at september 30, 2014 and december 31, 2013, respectively                                        52,240,000                                        
  acquired lease intangible liabilities, less accumulated accretion of 13,013 and 10,102 at september 30, 2014 and december 31, 2013, respectively                                        31,831,000                                        
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at september 30, 2014 and december 31, 2013, with liquidation preferences of 25 per share                                        325,000,000                                        
  exchangeable operating partnership units, aggregate redemption value of 8,299 and 7,676 at september 30, 2014 and december 31, 2013, respectively                                        -1,935,000                                        
  straight-line rent receivable, net of reserve of 716 and 547 at june 30, 2014 and december 31, 2013, respectively                                         53,673,000                                       
  deferred costs, less accumulated amortization of 76,838 and 73,231 at june 30, 2014 and december 31, 2013, respectively                                         73,659,000                                       
  acquired lease intangible assets, less accumulated amortization of 30,930 and 25,591 at june 30, 2014 and december 31, 2013, respectively                                         53,543,000                                       
  acquired lease intangible liabilities, less accumulated accretion of 12,130 and 10,102 at june 30, 2014 and december 31, 2013, respectively                                         29,703,000                                       
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at june 30, 2014 and december 31, 2013, with liquidation preferences of 25 per share                                         325,000,000                                       
  exchangeable operating partnership units, aggregate redemption value of 8,872 and 7,676 at june 30, 2014 and december 31, 2013, respectively                                         -1,817,000                                       
  straight-line rent receivable, net of reserve of 528 and 547 at march 31, 2014 and december 31, 2013, respectively                                          52,205,000                                      
  deferred costs, less accumulated amortization of 75,413 and 73,231 at march 31, 2014 and december 31, 2013, respectively                                          70,543,000                                      
  acquired lease intangible assets, less accumulated amortization of 27,842 and 25,591 at march 31, 2014 and december 31, 2013, respectively                                          57,028,000                                      
  acquired lease intangible liabilities, less accumulated accretion of 11,158 and 10,102 at march 31, 2014 and december 31, 2013, respectively                                          31,128,000                                      
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at march 31, 2014 and december 31, 2013, with liquidation preferences of 25 per share                                          325,000,000                                      
  exchangeable operating partnership units, aggregate redemption value of 8,136 and 7,676 at march 31, 2014 and december 31, 2013, respectively                                          -1,782,000                                      
  straight-line rent receivable, net of reserve of 547 and 870 at december 31, 2013 and 2012, respectively                                           50,612,000                                     
  deferred costs, less accumulated amortization of 73,231 and 69,224 at december 31, 2013 and 2012, respectively                                           69,963,000                                     
  acquired lease intangible assets, less accumulated amortization of 25,591 and 19,148 at december 31, 2013 and 2012, respectively                                           44,805,000                                     
  acquired lease intangible liabilities, less accumulated accretion of 10,102 and 6,636 at december 31, 2013 and 2012, respectively                                           26,729,000                                     
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at december 31, 2013 and december 31, 2012, with liquidation preferences of 25 per share                                           325,000,000                                     
  common stock 0.01 par value per share,150,000,000 shares authorized; 92,333,161 and 90,394,486 shares issued at december 31, 2013 and 2012, respectively                                           923,000                                     
  exchangeable operating partnership units, aggregate redemption value of 7,676 and 8,348 at december 31, 2013 and 2012, respectively                                           -1,426,000                                     
  straight-line rent receivable, net of reserve of 451 and 870 at september 30, 2013 and december 31, 2012, respectively                                            50,422,000                                    
  deferred costs, less accumulated amortization of 72,808 and 69,224 at september 30, 2013 and december 31, 2012, respectively                                            69,553,000                                    
  acquired lease intangible assets, less accumulated amortization of 23,750 and 19,148 at september 30, 2013 and december 31, 2012, respectively                                            39,134,000                                    
  acquired lease intangible liabilities, less accumulated accretion of 9,123 and 6,636 at september 30, 2013 and december 31, 2012, respectively                                            25,480,000                                    
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at september 30, 2013 and december 31, 2012, with liquidation preferences of 25 per share                                            325,000,000                                    
  exchangeable operating partnership units, aggregate redemption value of 8,016 and 8,348 at september 30, 2013 and december 31, 2012, respectively                                            -1,462,000                                    
  straight-line rent receivable, net of reserve of 566 and 870 at june 30, 2013 and december 31, 2012, respectively                                             50,258,000                                   
  deferred costs, less accumulated amortization of 72,758 and 69,224 at june 30, 2013 and december 31, 2012, respectively                                             68,141,000                                   
  acquired lease intangible assets, less accumulated amortization of 21,860 and 19,148 at june 30, 2013 and december 31, 2012, respectively                                             41,331,000                                   
  acquired lease intangible liabilities, less accumulated accretion of 8,245 and 6,636 at june 30, 2013 and december 31, 2012, respectively                                             26,337,000                                   
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at june 30, 2013 and december 31, 2012, with liquidation preferences of 25 per share                                             325,000,000                                   
  common stock 0.01 par value per share,150,000,000 shares authorized; 92,279,321 and 90,394,486 shares issued at june 30, 2013 and december 31, 2012, respectively                                             923,000                                   
  exchangeable operating partnership units, aggregate redemption value of 9,002 and 8,348 at june 30, 2013 and december 31, 2012, respectively                                             -1,165,000                                   
  straight-line rent receivable, net of reserve of 568 and 870 at march 31, 2013 and december 31, 2012, respectively                                              51,403,000                                  
  deferred costs, less accumulated amortization of 71,640 and 69,224 at march 31, 2013 and december 31, 2012, respectively                                              68,206,000                                  
  acquired lease intangible assets, less accumulated amortization of 21,104 and 19,148 at march 31, 2013 and december 31, 2012, respectively                                              40,391,000                                  
  acquired lease intangible liabilities, less accumulated accretion of 7,393 and 6,636 at march 31, 2013 and december 31, 2012, respectively                                              19,510,000                                  
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 series 6 and 7 shares issued and outstanding at march 31, 2013 and december 31, 2012, respectively, with liquidation preferences of 25 per share                                              325,000,000                                  
  common stock 0.01 par value per share,150,000,000 shares authorized; 91,397,030 and 90,394,486 shares issued at march 31, 2013 and december 31, 2012, respectively                                              914,000                                  
  exchangeable operating partnership units, aggregate redemption value of 9,374 and 8,348 at march 31, 2013 and december 31, 2012, respectively                                              -1,193,000                                  
  straight-line rent receivable, net of reserve of 870 and 2,075 at december 31, 2012 and 2011, respectively                                               49,990,000                                 
  deferred costs, less accumulated amortization of 69,224 and 71,265 at december 31, 2012 and 2011, respectively                                               69,506,000                                 
  acquired lease intangible assets, less accumulated amortization of 19,148 and 15,588 at december 31, 2012 and 2011, respectively                                               42,459,000                                 
  acquired lease intangible liabilities, less accumulated accretion of 6,636 and 4,750 at december 31, 2012 and 2011, respectively                                               20,325,000                                 
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 and 11,000,000 series 3-7 shares issued and outstanding at december 31, 2012 and 2011, respectively, with liquidation preferences of 25 per share                                               325,000,000                                 
  common stock 0.01 par value per share,150,000,000 shares authorized; 90,394,486 and 89,921,858 shares issued at december 31, 2012 and 2011, respectively                                               904,000                                 
  series d preferred units, aggregate redemption value of 50,000 at december 31, 2011                                                                                
  exchangeable operating partnership units, aggregate redemption value of 8,348 and 6,665 at december 31, 2012 and 2011, respectively                                               -1,153,000                                 
  straight-line rent receivable, net of reserve of 870 and 2,075 at september 30, 2012 and december 31, 2011, respectively                                                48,677,000                                
  deferred costs, less accumulated amortization of 66,477 and 71,265 at september 30, 2012 and december 31, 2011, respectively                                                68,141,000                                
  acquired lease intangible assets, less accumulated amortization of 17,482 and 15,588 at september 30, 2012 and december 31, 2011, respectively                                                35,581,000                                
  derivative instruments, at fair value                                                86,000 73,000 59,000 37,000      28,279,000 34,279,000 28,363,000 39,036,000 27,577,000 61,481,000 83,691,000                 
  acquired lease intangible liabilities, less accumulated accretion of 5,947 and 4,750 at september 30, 2012 and december 31, 2011, respectively                                                18,506,000                                
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 and 11,000,000 series 3-7 shares issued and outstanding at september 30, 2012 and december 31, 2011, respectively, with liquidation preferences of 25 per share                                                325,000,000                                
  common stock 0.01 par value per share,150,000,000 shares authorized; 90,387,798 and 89,921,858 shares issued at september 30, 2012 and december 31, 2011, respectively                                                904,000                                
  exchangeable operating partnership units, aggregate redemption value of 8,633 and 6,665 at september 30, 2012 and december 31, 2011, respectively                                                -1,079,000                                
  straight-line rent receivable, net of reserve of 1,648 and 2,075 at june 30, 2012 and december 31, 2011, respectively                                                 50,934,000                               
  deferred costs, less accumulated amortization of 73,609 and 71,265 at june 30, 2012 and december 31, 2011, respectively                                                 71,597,000                               
  acquired lease intangible assets, less accumulated amortization of 17,339 and 15,588 at june 30, 2012 and december 31, 2011, respectively                                                 26,835,000                               
  acquired lease intangible liabilities, less accumulated accretion of 5,452 and 4,750 at june 30, 2012 and december 31, 2011, respectively                                                 11,971,000                               
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized; 13,000,000 and 11,000,000 series 3-6 shares issued and outstanding at june 30, 2012 and december 31, 2011, respectively, with liquidation preferences of 25 per share                                                 325,000,000                               
  common stock 0.01 par value per share,150,000,000 shares authorized; 89,938,760 and 89,921,858 shares issued at june 30, 2012 and december 31, 2011, respectively                                                 899,000                               
  exchangeable operating partnership units, aggregate redemption value of 8,428 and 6,665 at june 30, 2012 and december 31, 2011, respectively                                                 -1,041,000                               
  straight-line rent receivable, net of reserve of 1,871 and 2,075 at march 31, 2012 and december 31, 2011, respectively                                                  49,625,000                              
  deferred costs, less accumulated amortization of 71,385 and 71,265 at march 31, 2012 and december 31, 2011, respectively                                                  71,094,000                              
  acquired lease intangible assets, less accumulated amortization of 16,705 and 15,588 at march 31, 2012 and december 31, 2011, respectively                                                  25,937,000                              
  acquired lease intangible liabilities, less accumulated accretion of 5,143 and 4,750 at march 31, 2012 and december 31, 2011, respectively                                                  12,269,000                              
  preferred stock, 0.01 par value per share, 32,000,000 shares authorized; 13,000,000 and 11,000,000 series 3-6 shares issued and outstanding at march 31, 2012 and december 31, 2011, respectively, with liquidation preferences of 25 per share                                                  325,000,000                              
  common stock 0.01 par value per share,150,000,000 shares authorized; 89,929,528 and 89,921,858 shares issued at march 31, 2012 and december 31, 2011, respectively                                                  899,000                              
  exchangeable operating partnership units, aggregate redemption value of 7,880 and 6,665 at march 31, 2012 and december 31, 2011, respectively                                                  -990,000                              
  straight-line rent receivable, net of reserve of 2,075 and 1,396 at december 31, 2011 and 2010, respectively                                                   48,132,000                             
  deferred costs, less accumulated amortization of 71,265 and 69,158 at december 31, 2011 and 2010, respectively                                                   70,204,000                             
  acquired lease intangible assets, less accumulated amortization of 15,588 and 13,996 at december 31, 2011 and 2010, respectively                                                   27,054,000                             
  unsecured line of credit                                                   40,000,000 85,000,000 30,000,000              208,000,000 110,000,000 30,000,000 236,000,000 121,000,000 158,000,000 103,000,000 108,000,000 162,000,000 125,000,000 265,000,000 175,000,000 200,000,000 
  acquired lease intangible liabilities, less accumulated accretion of 4,750 and 11,010 at december 31, 2011 and 2010, respectively                                                   12,662,000                             
  preferred stock, 0.01 par value per share, 30,000,000 shares authorized;11,000,000 series 3-5 shares issued and outstanding at december 31, 2011 and 2010 with liquidation preferences of 25 per share                                                   275,000,000                             
  common stock 0.01 par value per share,150,000,000 shares authorized; 89,921,858 and 81,886,872 shares issued at december 31, 2011 and 2010, respectively                                                   899,000                             
  series d preferred units, aggregate redemption value of 50,000 at december 31, 2011 and 2010                                                   49,158,000                             
  exchangeable operating partnership units, aggregate redemption value of 6,665 and 7,483 at december 31, 2011 and 2010, respectively                                                   -963,000                             
  straight-line rent receivable, net of allowance of 2,087 and 1,396 at september 30, 2011 and december 31, 2010, respectively                                                    48,327,000                            
  deferred costs, less accumulated amortization of 68,656 and 69,158 at september 30, 2011 and december 31, 2010, respectively                                                    70,006,000                            
  acquired lease intangible assets, less accumulated amortization of 14,562 and 13,996 at september 30, 2011 and december 31, 2010, respectively                                                    26,855,000                            
  acquired lease intangible liabilities, less accumulated accretion of 4,399 and 11,010 at september 30, 2011 and december 31, 2010, respectively                                                    13,694,000                            
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at september 30, 2011 and december 31, 2010 with liquidation preferences of 25 per share                                                    275,000,000                            
  common stock .01 par value per share, 150,000,000 shares authorized; 89,913,234 and 81,886,872 shares issued at september 30, 2011 and december 31, 2010, respectively                                                    899,000                            
  series d preferred units, aggregate redemption value of 50,000 at september 30, 2011 and december 31, 2010                                                    49,158,000                            
  exchangeable operating partnership units, aggregate redemption value of 6,259 and 7,483 at september 30, 2011 and december 31, 2010, respectively                                                    -917,000                            
  straight-line rent receivable, net of allowance of 1,598 and 1,396 at june 30, 2011 and december 31, 2010, respectively                                                     47,768,000                           
  deferred costs, less accumulated amortization of 68,172 and 69,158 at june 30, 2011 and december 31, 2010, respectively                                                     62,912,000                           
  acquired lease intangible assets, less accumulated amortization of 13,707 and 13,996 at june 30, 2011 and december 31, 2010, respectively                                                     18,320,000                           
  acquired lease intangible liabilities, less accumulated accretion of 4,434 and 11,010 at june 30, 2011 and december 31, 2010, respectively                                                     8,682,000                           
  tenants’ security and escrow deposits                                                     11,152,000 10,876,000 10,790,000 10,604,000 10,565,000 10,623,000 10,628,000 10,823,000 11,097,000 11,324,000 11,571,000 11,869,000 11,927,000  11,436,000 10,898,000 10,643,000 10,561,000 10,517,000 10,839,000 10,684,000 10,206,000 10,276,000 10,116,000 10,027,000 9,959,000 10,049,000 
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at june 30, 2011 and december 31, 2010 with liquidation preferences of 25 per share                                                     275,000,000                           
  common stock .01 par value per share, 150,000,000 shares authorized; 89,905,318 and 81,886,872 shares issued at june 30, 2011 and december 31, 2010, respectively                                                     899,000                           
  series d preferred units, aggregate redemption value of 50,000 at june 30, 2011 and december 31, 2010                                                     49,158,000                           
  exchangeable operating partnership units, aggregate redemption value of 7,790 and 7,483 at june 30, 2011 and december 31, 2010, respectively                                                     -862,000                           
  straight-line rent receivable, net of allowance of 1,553 and 1,396 at march 31, 2011 and december 31, 2010, respectively                                                      46,815,000                          
  deferred costs, less accumulated amortization of 65,362 and 69,158 at march 31, 2011 and december 31, 2010, respectively                                                      62,635,000                          
  acquired lease intangible assets, less accumulated amortization of 15,057 and 13,996 at march 31, 2011 and december 31, 2010, respectively                                                      17,401,000                          
  acquired lease intangible liabilities, less accumulated accretion of 11,288 and 11,010 at march 31, 2011 and december 31, 2010, respectively                                                      6,404,000                          
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at march 31, 2011 and december 31, 2010 with liquidation preferences of 25 per share                                                      275,000,000                          
  common stock .01 par value per share, 150,000,000 shares authorized; 89,895,007 and 81,886,872 shares issued at march 31, 2011 and december 31, 2010, respectively                                                      899,000                          
  series d preferred units, aggregate redemption value of 50,000 at march 31, 2011 and december 31, 2010                                                      49,158,000                          
  exchangeable operating partnership units, aggregate redemption value of 7,703 and 7,483 at march 31, 2011 and december 31, 2010, respectively                                                      -826,000                          
  straight-line rent receivable, net of reserve of 1,396 and 1,899 at december 31, 2010 and 2009, respectively                                                       45,241,000                         
  deferred costs, less accumulated amortization of 69,158 and 58,861 at december 31, 2010 and 2009, respectively                                                       63,165,000                         
  acquired lease intangible assets, less accumulated amortization of 13,996 and 11,632 at december 31, 2010 and 2009, respectively                                                       18,219,000                         
  acquired lease intangible liabilities, less accumulated accretion of 11,010 and 9,715 at december 31, 2010 and 2009, respectively                                                       6,682,000                         
  stockholders' equity                                                                                
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at december 31, 2010 and 2009 with liquidation preferences of 25 per share                                                       275,000,000                         
  common stock .01 par value per share, 150,000,000 shares authorized; 81,886,872 and 81,539,296 shares issued at december 31, 2010 and 2009, respectively                                                       819,000                         
  series d preferred units, aggregate redemption value of 50,000 at december 31, 2010 and 2009                                                       49,158,000                         
  exchangeable operating partnership units, aggregate redemption value of 7,483 and 16,415 at december 31, 2010 and 2009, respectively                                                       -762,000                         
  straight-line rent receivable, net of allowance of 1,896 and 1,899 at september 30, 2010 and december 31, 2009                                                        43,619,000                        
  deferred costs, less accumulated amortization of 66,096 and 58,861 at september 30, 2010 and december 31, 2009, respectively                                                        58,243,000                        
  acquired lease intangible assets, less accumulated amortization of 13,320 and 11,632 at september 30, 2010 and december 31, 2009, respectively                                                        9,722,000                        
  acquired lease intangible liabilities, less accumulated accretion of 10,755 and 9,715 at september 30, 2010 and december 31, 2009, respectively                                                        5,403,000                        
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at september 30, 2010 and december 31, 2009 with liquidation preferences of 25 per share                                                        275,000,000                        
  common stock .01 par value per share, 150,000,000 shares authorized; 81,867,133 and 81,539,296 shares issued at september 30, 2010 and december 31, 2009, respectively                                                        819,000                        
  series d preferred units, aggregate redemption value of 50,000 at september 30, 2010 and december 31, 2009                                                        49,158,000                        
  exchangeable operating partnership units, aggregate redemption value of 7,466 and 16,415 at september 30, 2010 and december 31, 2009, respectively                                                        -285,000                        
  straight-line rent receivable, net of reserve of 1,896 and 1,899 at june 30, 2010 and december 31, 2009                                                         41,440,000                       
  deferred costs, less accumulated amortization of 64,438 and 58,861 at june 30, 2010 and december 31, 2009, respectively                                                         58,115,000                       
  acquired lease intangible assets, less accumulated amortization of 12,749 and 11,632 at june 30, 2010 and december 31, 2009, respectively                                                         8,784,000                       
  acquired lease intangible liabilities, less accumulated accretion of 10,537 and 9,715 at june 30, 2010 and december 31, 2009, respectively                                                         5,059,000                       
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at june 30, 2010 and december 31, 2009 with liquidation preferences of 25 per share                                                         275,000,000                       
  common stock .01 par value per share, 150,000,000 shares authorized; 81,857,922 and 81,539,296 shares issued at june 30, 2010 and december 31, 2009, respectively                                                         819,000                       
  series d preferred units, aggregate redemption value of 50,000 at june 30, 2010 and december 31, 2009                                                         49,158,000                       
  exchangeable operating partnership units, aggregate redemption value of 6,507 and 16,415 at june 30, 2010 and december 31, 2009, respectively                                                         -215,000                       
  straight-line rent receivable, net of reserve of 1,899 at march 31, 2010 and december 31, 2009                                                          40,078,000                      
  deferred costs, less accumulated amortization of 61,290 and 58,861 at march 31, 2010 and december 31, 2009, respectively                                                          57,985,000                      
  acquired lease intangible assets, less accumulated amortization of 12,173 and 11,632 at march 31, 2010 and december 31, 2009, respectively                                                          9,361,000                      
  acquired lease intangible liabilities, less accumulated accretion of 10,166 and 9,715 at march 31, 2010 and december 31, 2009, respectively                                                          5,430,000                      
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at march 31, 2010 and december 31, 2009 with liquidation preferences of 25 per share                                                          275,000,000                      
  common stock .01 par value per share, 150,000,000 shares authorized; 81,584,156 and 81,539,296 shares issued at march 31, 2010 and december 31, 2009, respectively                                                          816,000                      
  series d preferred units, aggregate redemption value of 50,000 at march 31, 2010 and december 31, 2009                                                          49,158,000                      
  exchangeable operating partnership units, aggregate redemption value of 16,636 and 16,415 at march 31, 2010 and december 31, 2009, respectively                                                          6,532,000                      
  straight line rent receivable, net of reserve of 1,899 at december 31, 2009                                                           39,292,000                     
  other receivables                                                              19,700,000 19,700,000                 
  deferred costs, less accumulated amortization of 58,861 and 51,549 at december 31, 2009 and 2008, respectively                                                           58,376,000                     
  acquired lease intangible assets, less accumulated amortization of 11,632 and 11,204 at december 31, 2009 and 2008, respectively                                                           10,007,000                     
  acquired lease intangible liabilities, less accumulated accretion of 9,715 and 8,829 at december 31, 2009 and 2008, respectively                                                           5,896,000                     
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at december 31, 2009 and 2008 with liquidation preferences of 25 per share                                                           275,000,000                     
  common stock .01 par value per share, 150,000,000 shares authorized; 81,539,296 and 75,634,881 shares issued at december 31, 2009 and 2008, respectively                                                           815,000                     
  series d preferred units, aggregate redemption value of 50,000 at december 31, 2009 and 2008                                                           49,158,000                     
  exchangeable operating partnership units, aggregate redemption value of 16,415 and 21,865 at december 31, 2009 and 2008, respectively                                                           7,321,000                     
  limited partners’ interest in consolidated partnerships                                                           11,748,000 11,804,000 9,051,000 8,075,000 7,980,000 8,221,000 8,124,000  18,392,000 14,544,000 14,764,000 14,613,000 17,797,000 17,834,000 16,419,000 11,978,000 11,088,000 1,454,000 2,028,000 1,932,000 1,827,000 
  straight line rent receivable, net of reserve of 1,683 at september 30, 2009                                                            39,518,000                    
  deferred costs, less accumulated amortization of 57,722 and 51,549 at september 30, 2009 and december 31, 2008, respectively                                                            56,803,000                    
  acquired lease intangible assets, less accumulated amortization of 11,635 and 11,204 at september 30, 2009 and december 31, 2008, respectively                                                            10,661,000                    
  acquired lease intangible liabilities, less accumulated accretion of 9,242 and 8,829 at september 30, 2009 and december 31, 2008, respectively                                                            6,369,000                    
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at september 30, 2009 and december 31, 2008 with liquidation preferences of 25 per share                                                            275,000,000                    
  common stock .01 par value per share, 150,000,000 shares authorized; 85,976,167 and 75,634,881 shares issued at september 30, 2009 and december 31, 2008, respectively                                                            860,000                    
  preferred units, aggregate redemption value of 50,000 at september 30, 2009 and december 31, 2008                                                            49,158,000                    
  exchangeable operating partnership units, aggregate redemption value of 17,347 and 21,865 at september 30, 2009 and december 31, 2008, respectively                                                            7,558,000                    
  tenant receivables, net of allowance for doubtful accounts of 5,461 and 1,593 at june 30, 2009 and december 31, 2008, respectively                                                             69,076,000                   
  deferred costs, less accumulated amortization of 55,115 and 51,549 at june 30, 2009 and december 31, 2008, respectively                                                             56,201,000                   
  acquired lease intangible assets, less accumulated amortization of 11,136 and 11,204 at june 30, 2009 and december 31, 2008, respectively                                                             11,408,000                   
  acquired lease intangible liabilities, less accumulated accretion of 8,807 and 8,829 at june 30, 2009 and december 31, 2008, respectively                                                             6,874,000                   
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at june 30, 2009 and december 31, 2008 with liquidation preferences of 25 per share                                                             275,000,000                   
  common stock .01 par value per share, 150,000,000 shares authorized; 85,703,371 and 75,634,881 shares issued at june 30, 2009 and december 31, 2008, respectively                                                             857,000                   
  preferred units, aggregate redemption value of 50,000 at june 30, 2009 and december 31, 2008                                                             49,158,000                   
  exchangeable operating partnership units, aggregate redemption value of 16,345 and 21,865 at june 30, 2009 and december 31, 2008, respectively                                                             8,298,000                   
  tenant receivables, net of allowance for uncollectible accounts of 1,627 and 1,593 at march 31, 2009 and december 31, 2008, respectively                                                              76,529,000                  
  deferred costs, less accumulated amortization of 54,424 and 51,549 at march 31, 2009 and december 31, 2008, respectively                                                              55,419,000                  
  acquired lease intangible assets, less accumulated amortization of 10,515 and 11,204 at march 31, 2009 and december 31, 2008, respectively                                                              12,111,000                  
  acquired lease intangible liabilities, less accumulated accretion of 8,523 and 8,829 at march 31, 2009 and december 31, 2008, respectively                                                              7,358,000                  
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at march 31, 2009 and december 31, 2008 with liquidation preferences of 25 per share                                                              275,000,000                  
  common stock .01 par value per share, 150,000,000 shares authorized; 75,682,133 and 75,634,881 shares issued at march 31, 2009 and december 31, 2008, respectively                                                              756,000                  
  preferred units, aggregate redemption value of 50,000 at march 31, 2009 and december 31, 2008                                                              49,158,000                  
  exchangeable operating partnership units, aggregate redemption value of 12,440 and 21,865 at march 31, 2009 and december 31, 2008, respectively                                                              8,556,000                  
  tenant receivables, net of allowance for uncollectible accounts of 1,593 and 2,482 at december 31, 2008 and 2007, respectively                                                               84,096,000                 
  deferred costs, less accumulated amortization of 51,549 and 43,470 at december 31, 2008 and 2007, respectively                                                               57,477,000                 
  acquired lease intangible assets, less accumulated amortization of 11,204                                                                                
  and 7,362 at december 31, 2008 and 2007, respectively                                                               12,903,000                 
  liabilities, minority interests, and stockholders’ equity                                                                                
  acquired lease intangible liabilities, less accumulated accretion of 8,829 and 6,371 at december 31, 2008 and 2007, respectively                                                               7,865,000                 
  minority interests:                                                                                
  preferred units                                                               49,158,000 49,158,000 49,158,000 49,158,000 49,158,000 49,158,000 49,158,000 49,158,000 49,158,000 49,158,000 49,158,000 49,158,000 49,158,000 49,158,000 101,762,000 101,762,000 101,762,000 
  exchangeable operating partnership units, aggregate redemption value of 21,865 and 30,543 at december 31, 2008 and 2007, respectively                                                               9,059,000                 
  total minority interests                                                               66,197,000                 
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at december 31, 2008 with liquidation preferences of 25 per share and 800,000 series 3 and 4 shares and 3,000,000 series 5 shares issued and outstanding at december 31, 2007 with liquidation preferences of 250 and 25 per share, respectively                                                               275,000,000                 
  common stock .01 par value per share, 150,000,000 shares authorized; 75,634,881 and 75,168,662 shares issued at december 31, 2008 and 2007, respectively                                                               756,000                 
  total liabilities, minority interests, and stockholders’ equity                                                               4,142,375,000                 
  tenant receivables, net of allowance for uncollectible accounts of 1,692 and 2,482 at september 30, 2008 and december 31, 2007, respectively                                                                73,936,000                
  deferred costs, less accumulated amortization of 49,165 and 43,470 at september 30, 2008 and december 31, 2007, respectively                                                                58,289,000                
  acquired lease intangible assets, less accumulated amortization of 10,891 and 7,362 at september 30, 2008 and december 31, 2007, respectively                                                                13,698,000                
  liabilities and stockholders’ equity                                                                                
  acquired lease intangible liabilities, less accumulated accretion of 8,319 and 6,371 at september 30, 2008 and december 31, 2007, respectively                                                                8,407,000                
  exchangeable operating partnership units, aggregate redemption value of 31,225 and 30,543 at september 30, 2008 and december 31, 2007, respectively                                                                10,464,000                
  total minority interest                                                                67,843,000 67,737,000 78,023,000 78,382,000 74,676,000 77,970,000 79,045,000 83,896,000 84,270,000 86,203,000 86,879,000 88,165,000 78,592,000 131,645,000 133,018,000 134,364,000 
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at september 30, 2008 with liquidation preferences of 25 per share and 800,000 series 3 and 4 shares and 3,000,000 series 5 shares issued and outstanding at december 31, 2007 with liquidation preferences of 250 and 25 per share, respectively                                                                275,000,000                
  common stock .01 par value per share, 150,000,000 shares authorized; 75,598,609 and 75,168,662 shares issued at september 30, 2008 and december 31, 2007, respectively                                                                756,000                
  tenant receivables, net of allowance for uncollectible accounts of 2,077 and 2,482 at june 30, 2008 and december 31, 2007, respectively                                                                 71,663,000               
  deferred costs, less accumulated amortization of 48,614 and 43,470 at june 30, 2008 and december 31, 2007, respectively                                                                 58,062,000               
  acquired lease intangible assets, less accumulated amortization of 9,594 and 7,362 at june 30, 2008 and december 31, 2007, respectively                                                                 14,995,000               
  acquired lease intangible liabilities, less accumulated accretion of 7,760 and 6,371 at june 30, 2008 and december 31, 2007, respectively                                                                 8,965,000               
  exchangeable operating partnership units, aggregate redemption value of 27,681 and 30,543 at june 30, 2008 and december 31, 2007, respectively                                                                 10,455,000               
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at june 30, 2008 with liquidation preferences of 25 per share and 800,000 series 3 and 4 shares and 3,000,000 series 5 shares issued and outstanding at december 31, 2007 with liquidation preferences of 250 and 25 per share, respectively                                                                 275,000,000               
  common stock .01 par value per share, 150,000,000 shares authorized; 75,567,808 and 75,168,662 shares issued at june 30, 2008 and december 31, 2007, respectively                                                                 756,000               
  tenant receivables, net of allowance for uncollectible accounts of 2,547 and 2,482 at march 31, 2008 and december 31, 2007, respectively                                                                  67,461,000              
  deferred costs, less accumulated amortization of 46,265 and 43,470 at march 31, 2008 and december 31, 2007, respectively                                                                  56,675,000              
  acquired lease intangible assets, less accumulated amortization of 8,373 and 7,362 at march 31, 2008 and december 31, 2007, respectively                                                                  16,217,000              
  liabilities and stockholders' equity                                                                                
  acquired lease intangible liabilities, less accumulated accretion of 6,949 and 6,371 at march 31, 2008 and december 31, 2007, respectively                                                                  9,776,000              
  tenants' security and escrow deposits                                                                  11,776,000              
  exchangeable operating partnership units, aggregate redemption value of 30,321 and 30,543 at march 31, 2008 and december 31, 2007, respectively                                                                  10,531,000              
  limited partners' interest in consolidated partnerships                                                                  18,334,000              
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 11,000,000 series 3-5 shares issued and outstanding at march 31, 2008 with liquidation preferences of 25 and 800,000 series 3 and 4 shares and 3,000,000 series 5 shares issued and outstanding at december 31, 2007 with liquidation preferences of 250 and 25 per share, respectively                                                                  275,000,000              
  common stock .01 par value per share, 150,000,000 shares authorized; 75,520,392 and 75,168,662 shares issued at march 31, 2008 and december 31, 2007, respectively                                                                  755,000              
  tenant receivables, net of allowance for uncollectible accounts of 2,482 and 3,532 at december 31, 2007 and 2006, respectively                                                                   75,441,000             
  deferred costs, less accumulated amortization of 43,470 and 36,227 at december 31, 2007 and 2006, respectively                                                                   52,784,000             
  acquired lease intangible assets, less accumulated amortization of 14,914 and 10,511 at december 31, 2007 and 2006, respectively                                                                   17,228,000             
  acquired lease intangible liabilities, less accumulated accretion of 6,371 and 4,331 at december 31, 2007 and 2006, respectively                                                                   10,354,000             
  exchangeable operating partnership units, aggregate redemption value of 30,543 at december 31, 2007                                                                   10,832,000             
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 3,000,000 series 5 and 800,000 series 3 and 4 shares issued and outstanding at both december 31, 2007 and 2006 with liquidation preferences of 25 and 250 per share, respectively                                                                   275,000,000             
  common stock .01 par value per share, 150,000,000 shares authorized; 75,168,662 and 74,431,787 shares issued at december 31, 2007 and 2006, respectively                                                                   752,000             
  revenues:                                                                                
  minimum rent                                                                   320,323,000 81,033,000 77,960,000 77,456,000 295,391,000 75,783,000 75,850,000 74,214,000 283,626,000 73,181,000 72,704,000 73,682,000 286,081,000 
  percentage rent                                                                   4,661,000 889,000 342,000 735,000 4,428,000 1,002,000 527,000 437,000 4,353,000 855,000 270,000 551,000 4,083,000 
  recoveries from tenants                                                                   93,460,000 24,269,000 22,962,000 22,143,000 86,134,000 22,942,000 20,645,000 21,403,000 80,948,000 20,217,000 20,716,000 21,746,000 80,927,000 
  management, acquisition and other fees                                                                   33,064,000 10,789,000 7,496,000 6,381,000 31,805,000 5,327,000 12,141,000 7,260,000 28,019,000 3,326,000 16,848,000   
  total revenues                                                                   451,508,000 116,980,000 108,760,000 106,715,000 420,338,000 105,632,000 108,825,000 104,069,000 394,038,000 93,626,000 111,484,000 101,688,000 391,948,000 
  operating expenses:                                                                                
  depreciation and amortization                                                                   93,257,000 24,364,000 21,988,000 21,518,000 84,694,000 21,989,000 21,667,000 21,147,000 80,653,000 20,438,000 21,166,000 21,004,000 81,125,000 
  operating and maintenance                                                                   56,930,000 13,855,000 13,363,000 13,106,000 51,580,000 13,022,000 12,641,000 12,242,000 51,709,000 13,334,000 13,240,000 13,592,000 53,863,000 
  general and administrative                                                                   50,580,000 12,159,000 12,907,000 12,297,000 45,495,000 10,765,000 10,830,000 10,803,000 37,815,000 9,148,000 9,402,000 8,652,000 30,282,000 
  real estate taxes                                                                   45,916,000 11,608,000 11,546,000 11,374,000 42,825,000 10,653,000 11,376,000 10,853,000 40,582,000 10,184,000 10,148,000 10,488,000 40,403,000 
  other incomes                                                                   10,081,000 1,625,000 1,261,000 460,000 15,927,000 -825,000 1,733,000 3,658,000 2,758,000 204,000 534,000 1,428,000 8,043,000 
  total operating expenses                                                                   256,764,000 63,611,000 61,065,000 58,755,000 240,521,000 55,604,000 58,247,000 58,703,000 213,517,000 53,308,000 54,490,000 55,164,000 213,716,000 
  other income:                                                                                
  interest expense, net of interest income of 3,079, 4,232 and 2,361 in 2007, 2006 and 2005, respectively                                                                   82,494,000             
  gain on sale of operating properties and properties in development                                                                   -52,215,000 -5,492,000 -3,449,000 -25,645,000 -65,600,000 -15,414,000 -9,593,000 -15,680,000 -18,970,000 -3,750,000 -3,598,000 -6,542,000 -39,387,000 
  total other income                                                                   30,279,000 15,023,000 16,862,000 -6,256,000 14,090,000 4,707,000 10,524,000 3,784,000 69,004,000 19,206,000 18,719,000 14,534,000 42,619,000 
  income before minority interests and equity in income of investments in real estate partnerships                                                                   164,465,000 38,346,000 30,833,000 54,216,000          
  minority interest of preferred units                                                                   -3,725,000 -931,000 -931,000 -931,000 -3,725,000 -931,000 -931,000 -931,000 -8,105,000 -2,949,000 -2,113,000 -2,112,000 -19,829,000 
  minority interest of exchangeable operating partnership units                                                                   -1,424,000 -276,000 -265,000 -540,000 -1,994,000 -459,000 -457,000 -658,000 -2,083,000 -333,000 -751,000 -656,000 -2,156,000 
  minority interest of limited partners                                                                   -990,000 -241,000 -238,000 -278,000 -4,863,000 -16,000 -4,264,000 -511,000 -263,000 -45,000 -82,000 -76,000 -319,000 
  equity in income of investments in real estate partnerships                                                                   18,093,000 1,677,000 780,000 3,788,000 2,580,000 578,000 -338,000 755,000 -2,908,000 -3,953,000 946,000 2,391,000 10,194,000 
  income from continuing operations                                                                   176,419,000 38,575,000 30,179,000 56,255,000 155,145,000 43,915,000 34,402,000 39,482,000 101,066,000 17,785,000 35,329,000 29,146,000 113,309,000 
  discontinued operations                                                                   390 50 280 10 930 10 40 460 960 220 140 150 370 
  operating income from discontinued operations                                                                   1,947,000 184,000 396,000 733,000 4,999,000 369,000 -450,000 952,000 8,341,000 712,000 973,000 406,000 4,142,000 
  income from discontinued operations                                                                   27,232,000 3,324,000 19,105,000 733,000 63,366,000 396,000 2,645,000 31,293,000 61,581,000 14,278,000 8,551,000 9,202,000 23,018,000 
  net income                                                                   203,651,000 41,899,000 49,284,000 56,988,000 218,511,000 44,311,000 37,047,000 70,775,000 162,647,000 32,063,000 43,880,000 38,348,000 136,327,000 
  preferred stock dividends                                                                   -19,675,000 -4,919,000 -4,919,000 -4,919,000 -19,675,000 -4,919,000 -4,919,000 -4,919,000 -16,744,000 -4,500,000 -3,663,000 -3,662,000 -8,633,000 
  net income for common stockholders                                                                   183,976,000 36,980,000 44,365,000 52,069,000 198,836,000 39,392,000 32,128,000 65,856,000 145,903,000 27,563,000 40,217,000 34,686,000 127,694,000 
  income per common share—basic                                                                                
  continuing operations                                                                   2,260 480 360 740 1,980 560 430 510 1,290 200 500 400 1,710 
  net income for common stockholders per share                                                                   2,650 530 640 750 2,910 570 470 970 2,250 420 640 550 2,080 
  income per common share—diluted                                                                                
  tenant receivables, net of allowance for uncollectible accounts of 3,117 and 3,961 at september 30, 2007 and december 31, 2006, respectively                                                                    65,634,000            
  deferred costs, less accumulated amortization of 41,433 and 36,227 at september 30, 2007 and december 31, 2006, respectively                                                                    51,533,000            
  acquired lease intangible assets, less accumulated amortization of 13,677 and 10,511 at september 30, 2007 and december 31, 2006, respectively                                                                    18,466,000            
  acquired lease intangible liabilities                                                                    10,977,000 9,097,000 7,344,000 7,729,000 8,156,000 8,558,000 3,969,000 4,207,000 4,446,000 4,684,000 4,923,000 5,161,000 
  exchangeable operating partnership units                                                                    10,974,000 14,048,000 15,274,000 16,941,000 17,278,000 20,626,000 25,743,000 27,919,000 27,980,000 27,855,000 29,324,000 30,775,000 
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 3,000,000 series 5 and 800,000 series 3 and 4 shares issued and outstanding at both september 30, 2007 and december 31, 2006 with liquidation preferences of 25 and 250 per share, respectively                                                                    275,000,000            
  common stock .01 par value per share, 150,000,000 shares authorized; 75,144,184 and 74,431,787 shares issued at september 30, 2007 and december 31, 2006, respectively                                                                    751,000            
  interest expense, net of interest income of 840 and 819 in 2007 and 2006, respectively                                                                    20,515,000            
  discontinued operations, net:                                                                                
  income per common share – basic:                                                                                
  income per common share – diluted:                                                                                
  tenant receivables, net of allowance for uncollectible accounts of 3,387 and 3,961 at june 30, 2007 and december 31, 2006, respectively                                                                     59,131,000           
  deferred costs, less accumulated amortization of 39,631 and 36,227 at june 30, 2007 and december 31, 2006, respectively                                                                     48,006,000           
  acquired lease intangible assets, less accumulated amortization of 12,044 and 10,511 at june 30, 2007 and december 31, 2006, respectively                                                                     14,218,000           
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 3,000,000 series 5 and 800,000 series 3 and 4 shares issued and outstanding at both june 30, 2007 and december 31, 2006 with liquidation preferences of 25 and 250 per share, respectively                                                                     275,000,000           
  common stock .01 par value per share, 150,000,000 shares authorized; 74,997,973 and 74,431,787 shares issued at june 30, 2007 and december 31, 2006, respectively                                                                     750,000           
  interest expense, net of interest income of 811 and 937 in 2007 and 2006, respectively                                                                     20,311,000           
  income per common share—basic:                                                                                
  income per common share—diluted:                                                                                
  tenant receivables, net of allowance for uncollectible accounts of 3,871 and 3,961 at march 31, 2007 and december 31, 2006, respectively                                                                      59,631,000          
  deferred costs, less accumulated amortization of 38,006 and 36,227 at march 31, 2007 and december 31, 2006, respectively                                                                      43,880,000          
  acquired lease intangible assets, less accumulated amortization of 11,257 and 10,511 at march 31, 2007 and december 31, 2006, respectively                                                                      11,569,000          
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 3,000,000 series 5 and 800,000 series 3 and 4 shares issued and outstanding at both march 31, 2007 and december 31, 2006 with liquidation preferences of 25 and 250 per share, respectively                                                                      275,000,000          
  common stock .01 par value per share, 150,000,000 shares authorized; 74,701,025 and 74,431,787 shares issued at march 31, 2007 and december 31, 2006, respectively                                                                      747,000          
  interest expense, net of interest income of 719 and 1,591 in 2007 and 2006, respectively                                                                      19,389,000          
  tenant receivables, net of allowance for uncollectible accounts of 3,532 and 3,849 at december 31, 2006 and 2005, respectively                                                                       67,162,000         
  deferred costs, less accumulated amortization of 36,227 and 31,846 at december 31, 2006 and 2005, respectively                                                                       40,989,000         
  acquired lease intangible assets, less accumulated amortization of 10,511 and 6,593 at december 31, 2006 and 2005, respectively                                                                       12,315,000         
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 3,000,000 and 800,000 shares issued and outstanding at both december 31, 2006 and 2005 with liquidation preferences of 25 and 250 per share, respectively                                                                       275,000,000         
  common stock .01 par value per share, 150,000,000 shares authorized; 74,431,787 and 73,263,472 shares issued at december 31, 2006 and 2005, respectively                                                                       744,000         
  other income                                                                                
  interest expense, net of interest income of 4,312, 2,361 and 3,125 in 2006, 2005 and 2004, respectively                                                                       79,690,000         
  benefit from loss on operating properties                                                                           550,000    810,000 
  income before minority interests                                                                       165,727,000 45,321,000 40,054,000 41,582,000 111,517,000 21,112,000 38,275,000 31,990,000 135,613,000 
  income per common share - basic                                                                                
  income per common share - diluted                                                                                
  tenant receivables, net of allowance for uncollectible accounts of 3,916 and 3,849 at september 30, 2006 and december 31, 2005, respectively                                                                        54,727,000        
  deferred costs, less accumulated amortization of 37,938 and 31,846 at september 30, 2006 and december 31, 2005, respectively                                                                        40,217,000        
  acquired lease intangible assets, less accumulated amortization of 9,597 and 6,593 at september 30, 2006 and december 31, 2005, respectively                                                                        13,229,000        
  notes payable for properties held for sale                                                                        14,590,000        
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 3,000,000 and 800,000 shares issued and outstanding at both september 30, 2006 and december 31, 2005 with liquidation preferences of 25 and 250 per share, respectively                                                                        275,000,000        
  common stock .01 par value per share, 150,000,000 shares authorized; 74,275,770 and 73,263,472 shares issued at september 30, 2006 and december 31, 2005, respectively                                                                        743,000        
  interest expense, net of interest income of 864 and 627 in 2006 and 2005, respectively                                                                        20,121,000        
  income per common share - basic:                                                                                
  income per common share - diluted:                                                                                
  tenant receivables, net of allowance for uncollectible accounts of 3,995 and 3,849 at june 30, 2006 and december 31, 2005, respectively                                                                         58,320,000       
  deferred costs, less accumulated amortization of 35,820 and 31,846 at june 30, 2006 and december 31, 2005, respectively                                                                         41,397,000       
  acquired lease intangible assets, less accumulated amortization of 8,473 and 6,593 at june 30, 2006 and december 31, 2005, respectively                                                                         14,352,000       
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 3,000,000 and 800,000 shares issued and outstanding at both june 30, 2006 and december 31, 2005 with liquidation preferences of 25 and 250 per share, respectively                                                                         275,000,000       
  common stock .01 par value per share, 150,000,000 shares authorized; 74,101,176 and 73,263,472 shares issued at june 30, 2006 and december 31, 2005, respectively                                                                         741,000       
  interest expense, net of interest income of 959 and 558 in 2006 and 2005, respectively                                                                         20,117,000       
  tenant receivables, net of allowance for uncollectible accounts of 3,932 and 3,849 at march 31, 2006 and december 31, 2005, respectively                                                                          52,034,000      
  deferred costs, less accumulated amortization of 33,497 and 31,846 at march 31, 2006 and december 31, 2005, respectively                                                                          41,811,000      
  acquired lease intangible assets, less accumulated amortization of 7,459 and 6,593 at march 31, 2006 and december 31, 2005, respectively                                                                          9,315,000      
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 3,000,000 and 800,000 shares issued and outstanding at both march 31, 2006 and december 31, 2005 with liquidation preferences of 25 and 250 per share, respectively                                                                          275,000,000      
  common stock .01 par value per share, 150,000,000 shares authorized; 73,814,374 and 73,263,472 shares issued at march 31, 2006 and december 31, 2005, respectively                                                                          738,000      
  interest expense, net of interest income of 1,591 and 486 in 2006 and 2005, respectively                                                                          19,464,000      
  tenant receivables, net of allowance for uncollectible accounts of 3,849 and 3,393 at december 31, 2005 and 2004, respectively                                                                           56,878,000     
  deferred costs, less accumulated amortization of 31,846 and 25,735 at december 31, 2005 and 2004, respectively                                                                           41,657,000     
  acquired lease intangible assets, less accumulated amortization of 6,593 and 2,602 at december 31, 2005 and 2004, respectively                                                                           10,182,000     
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 3,000,000 and 800,000 shares issued and outstanding at december 31, 2005 with liquidation preferences of 25 and 250 per share, respectively; 800,000 shares issued and outstanding at december 31, 2004, liquidation preference of 250                                                                           275,000,000     
  common stock .01 par value per share, 150,000,000 shares authorized; 73,263,472 and 67,970,538 shares issued at december 31, 2005 and 2004, respectively                                                                           733,000     
  restricted stock deferred compensation                                                                                
  interest expense, net of interest income of 2,361, 3,125 and 2,357 in 2005, 2004 and 2003, respectively                                                                           87,424,000     
  tenant receivables, net of allowance for uncollectible accounts of 3,823 and 3,393 at september 30, 2005 and december 31, 2004, respectively                                                                            57,819,000    
  deferred costs, less accumulated amortization of 30,289 and 25,735 at september 30, 2005 and december 31, 2004, respectively                                                                            42,207,000    
  acquired lease intangible assets                                                                            11,295,000 12,164,000 13,280,000 14,172,000 
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 3,000,000 and 800,000 shares issued and outstanding at september 30, 2005 with liquidation preferences of 25 and 250 per share, respectively; 800,000 shares issued and outstanding at december 31, 2004, liquidation preference of 250                                                                            275,000,000    
  common stock .01 par value per share, 150,000,000 shares authorized; 73,165,619 and 67,970,538 shares issued at september 30, 2005 and december 31, 2004, respectively                                                                            732,000    
  interest expense, net of interest income of 627 and 886 in 2005 and 2004, respectively                                                                            22,956,000    
  tenant receivables, net of allowance for uncollectible accounts of 3,694 and 3,393 at june 30, 2005 and december 31, 2004, respectively                                                                             57,640,000   
  deferred costs, less accumulated amortization of 29,046 and 25,735 at june 30, 2005 and december 31, 2004, respectively                                                                             39,783,000   
  bridge loan                                                                             275,000,000   
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 800,000 shares issued and outstanding at june 30, 2005 and december 31, 2004, liquidation preference 250 per share                                                                             200,000,000   
  common stock .01 par value per share, 150,000,000 shares authorized; 68,563,514 and 67,970,538 shares issued at june 30, 2005 and december 31, 2004, respectively                                                                             686,000   
  interest expense, net of interest income of 543 and 880 in 2005 and 2004, respectively                                                                             22,317,000   
  tenant receivables, net of allowance for uncollectible accounts of 3,683 and 3,393 at march 31, 2005 and december 31, 2004, respectively                                                                              50,051,000  
  deferred costs, less accumulated amortization of 27,751 and 25,735 at march 31, 2005 and december 31, 2004, respectively                                                                              40,502,000  
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 800,000 shares issued and outstanding at march 31, 2005 and december 31, 2004, liquidation preference 250 per share                                                                              200,000,000  
  common stock .01 par value per share, 150,000,000 shares authorized; 68,390,396 and 67,970,538 shares issued at march 31, 2005 and december 31, 2004, respectively                                                                              684,000  
  management fees and commissions                                                                              3,318,000 10,663,000 
  interest expense, net of interest income of 505 and 837 in 2005 and 2004, respectively                                                                              21,076,000  
  tenant receivables, net of allowance for uncollectible accounts of 3,393 and 3,353 at december 31, 2004 and 2003, respectively                                                                               60,911,000 
  deferred costs, less accumulated amortization of 25,735 and 29,493 at december 31, 2004 and 2003, respectively                                                                               41,002,000 
  preferred stock, .01 par value per share, 30,000,000 shares authorized; 800,000 and 300,000 shares issued and outstanding at december 31, 2004 and 2003, respectively, liquidation preference 250 per share                                                                               200,000,000 
  common stock .01 par value per share, 150,000,000 shares authorized; 67,970,538 and 64,956,077 shares issued at december 31, 2004 and 2003, respectively                                                                               680,000 
  interest expense, net of interest income of 3,128, 2,357, and 2,333 in 2004, 2003 and 2002, respectively                                                                               81,196,000 

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