7Baggers
Quarterly
Annual
    Unit: USD2025-09-30 2025-06-30 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 2021-03-31 2020-12-31 2020-09-30 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 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 
      
                                                                                   
      assets
                                                                                   
      current assets:
                                                                                   
      cash and cash equivalents
    46,592,000 24,057,000 97,198,000 108,676,000 74,163,000 74,304,000 580,974,000 433,799,000 206,601,000 55,141,000 207,624,000 186,312,000 216,727,000 196,134,000 262,122,000 462,564,000 339,761,000 484,204,000 351,900,000 401,430,000 420,396,000 518,624,000 356,972,000 403,571,000 322,286,000 228,960,000 280,627,000 190,282,000 177,468,000 140,571,000 159,937,000 127,462,000 78,091,000 33,833,000 47,551,000 10,171,000 15,014,000 10,673,000 7,133,000 11,472,000 11,412,000 12,789,000 113,038,000 34,787,000 8,169,000 19,789,000 41,244,000 30,174,000 12,104,000 7,370,000 29,183,000 12,857,000 6,902,000 11,015,000 54,219,000 75,850,000 42,262,000 28,664,000 5,450,000 5,057,000 4,783,000 9,469,000 4,171,000 3,641,000 3,945,000 3,615,000 24,104,000 30,943,000 35,231,000 34,840,000 6,328,000 977,000 1,289,000 1,990,000 2,564,000 3,604,000 4,913,000 1,069,000 986,000 
      customer receivables, less allowances of 9,106 and 9,272, respectively
    518,970,000                                                                               
      income taxes receivable
     34,140,000  5,002,000 10,800,000 6,823,000  18,554,000 16,007,000 9,359,000  12,738,000 10,097,000 8,606,000  19,218,000                                                                
      other receivables
    21,155,000 21,327,000 22,958,000 21,135,000 20,135,000 19,414,000 21,320,000 17,884,000 14,846,000 15,620,000 15,389,000 13,743,000 13,327,000 12,665,000 12,347,000 12,410,000 62,266,000 51,307,000 9,553,000 9,569,000 9,578,000 8,525,000 8,485,000 10,586,000 12,225,000 8,161,000 8,091,000 40,691,000 15,752,000 7,373,000 5,542,000 21,612,000 7,529,000 6,393,000 5,734,000 14,402,000 9,784,000 8,480,000 4,554,000 34,547,000 20,090,000 9,688,000 7,445,000 44,730,000 7,086,000 3,943,000 3,323,000 10,225,000 7,261,000 3,153,000 2,092,000 1,324,000 5,570,000 2,573,000 2,252,000 4,441,000 13,162,000 10,363,000 7,711,000 2,056,000 2,992,000 2,381,000 4,096,000 8,450,000 8,433,000 7,235,000 7,325,000 4,227,000 4,820,000 5,293,000 6,534,000 7,672,000 4,834,000 3,170,000 3,904,000 3,682,000 3,585,000 2,209,000 2,455,000 
      prepaid expenses and other current assets
    77,089,000 88,153,000 68,644,000 84,316,000 84,215,000 98,200,000 79,157,000 94,211,000 83,888,000 106,722,000 84,640,000 92,944,000 81,847,000 87,198,000 58,263,000 67,688,000 60,143,000 61,601,000 55,490,000 57,413,000 49,882,000 54,161,000 46,421,000 55,098,000 46,617,000 54,315,000 47,918,000 47,687,000 36,640,000 42,735,000 37,039,000 41,410,000 35,617,000 40,579,000 39,632,000 37,962,000 31,316,000 33,687,000 32,287,000 25,210,000 30,352,000 34,449,000 28,711,000 21,085,000 29,841,000 29,657,000 33,432,000 21,262,000 23,713,000 26,264,000 26,140,000 21,754,000 25,495,000 25,369,000 23,381,000 18,614,000                        
      total current assets
    663,806,000 698,143,000 734,384,000 720,683,000 735,059,000 807,113,000 1,263,660,000 1,143,333,000 954,216,000 730,609,000 896,950,000 933,740,000 1,111,197,000 1,209,090,000 1,280,957,000 1,383,787,000 1,278,852,000 1,311,115,000 1,223,261,000 1,243,339,000 1,138,496,000 968,570,000 831,006,000 866,834,000 806,978,000 741,420,000 783,878,000 706,229,000 696,315,000 647,585,000 615,450,000 584,653,000 513,095,000 444,612,000 425,074,000 382,622,000 389,155,000 371,859,000 355,624,000 381,730,000 436,206,000 421,665,000 499,893,000 433,143,000 394,601,000 382,373,000 388,974,000 332,979,000 333,276,000 324,082,000 324,964,000 275,028,000 305,739,000 301,158,000 327,900,000 331,852,000 318,589,000 296,136,000 222,582,000 221,063,000 206,832,000 194,007,000 174,175,000 195,843,000 193,804,000 188,225,000 209,230,000 262,510,000 260,966,000 238,504,000 216,277,000 219,098,000 211,304,000 234,170,000 256,367,000 267,454,000 273,690,000 164,202,000 150,213,000 
      property and equipment:
                                                                                   
      revenue equipment
    2,764,711,000 2,777,319,000 2,716,488,000 2,752,594,000 2,722,884,000 2,670,203,000 2,578,067,000 2,590,770,000 2,636,599,000 2,620,882,000 2,556,832,000 2,501,995,000 2,344,781,000 2,248,493,000 2,156,600,000 2,146,205,000 2,096,973,000 1,991,845,000 1,894,361,000 1,885,649,000 1,892,005,000 1,902,486,000 1,898,633,000 1,898,999,000 1,916,392,000 1,906,675,000 1,835,518,000 1,811,233,000 1,835,160,000 1,760,117,000 1,634,854,000 1,591,036,000 1,612,380,000 1,573,352,000 1,492,136,000 1,496,697,000 1,513,869,000 1,522,997,000 1,409,501,000 1,358,317,000 1,361,513,000 1,288,267,000 1,190,899,000 1,158,108,000 1,163,523,000 1,132,458,000 1,043,633,000 1,009,936,000 1,014,041,000 981,823,000 919,300,000 922,030,000 936,909,000 894,399,000 833,599,000 789,984,000 782,272,000 758,953,000 701,648,000 683,067,000 684,589,000 684,924,000 668,427,000 673,977,000 673,457,000 653,447,000 601,250,000 603,815,000 606,241,000 579,898,000 577,385,000 575,325,000 571,571,000 537,989,000 494,046,000 497,133,000 473,620,000 443,978,000 400,910,000 
      land and structures
    3,524,155,000 3,492,344,000 3,408,391,000 3,363,701,000 3,279,707,000 3,192,073,000 3,110,076,000 3,021,447,000 2,956,811,000 2,898,475,000 2,834,205,000 2,750,100,000 2,670,604,000 2,618,098,000 2,508,592,000 2,463,949,000 2,352,569,000 2,297,101,000 2,254,491,000 2,218,290,000 2,167,557,000 2,126,400,000 2,082,960,000 2,039,937,000 1,972,038,000 1,898,900,000 1,829,360,000 1,796,868,000 1,708,825,000 1,638,421,000 1,588,132,000 1,548,079,000 1,481,738,000 1,445,188,000 1,417,866,000 1,377,106,000 1,329,051,000 1,289,988,000 1,266,327,000 1,221,250,000 1,158,683,000 1,133,118,000 1,109,731,000 1,088,372,000 1,044,678,000 1,021,344,000 1,012,028,000 990,256,000 952,383,000 927,809,000 893,720,000 874,768,000 832,378,000 803,647,000 767,513,000 738,359,000 721,046,000 696,497,000 667,917,000 655,998,000 638,037,000 625,417,000 619,477,000 593,617,000 551,503,000 528,572,000 434,821,000 439,078,000 403,398,000 393,771,000 377,557,000 366,108,000 343,337,000 331,849,000 308,537,000 281,389,000 264,686,000 241,158,000 228,909,000 
      other fixed assets
    688,998,000 682,559,000 700,019,000 700,188,000 679,196,000 655,854,000 642,377,000 623,164,000 637,447,000 613,381,000 605,301,000 550,442,000 568,131,000 543,806,000 530,304,000 512,340,000 502,907,000 493,870,000 481,364,000 475,264,000 495,268,000 491,902,000 486,408,000 482,425,000 487,635,000 477,870,000 463,326,000 454,432,000 450,992,000 451,237,000 441,957,000 432,146,000 427,271,000 419,188,000 416,431,000 402,482,000 396,851,000 389,458,000 375,260,000 365,673,000 362,740,000 353,932,000 335,706,000 321,310,000 320,084,000 295,555,000 285,052,000 266,563,000 251,125,000 244,868,000 230,754,000 225,298,000 228,100,000 224,824,000 213,548,000 214,816,000 196,027,000 192,507,000 170,533,000 167,152,000 161,563,000 158,803,000 156,687,000 153,132,000 147,793,000 142,783,000 213,421,000 134,639,000 130,088,000 132,268,000 129,174,000 127,341,000 124,869,000 117,512,000 111,854,000 108,526,000 109,164,000 105,128,000 97,733,000 
      leasehold improvements
    15,646,000 14,959,000 14,919,000 14,919,000 14,914,000 14,645,000 14,534,000 14,436,000 14,497,000 14,427,000 13,598,000 13,516,000 13,506,000 13,486,000 13,486,000 13,131,000 13,055,000 12,904,000 12,975,000 12,226,000 12,043,000 12,103,000 11,822,000 11,709,000 11,538,000 11,008,000 10,873,000 10,619,000 8,749,000 8,747,000 8,705,000 8,668,000 8,654,000 8,617,000 8,733,000 8,699,000 8,664,000 8,638,000 8,686,000 7,585,000 7,394,000 6,434,000 6,326,000 6,982,000 7,096,000 7,059,000 6,437,000 6,378,000 6,172,000 6,160,000 6,051,000 6,128,000 5,994,000 5,918,000 5,827,000 5,773,000 5,919,000 4,535,000 4,421,000 4,288,000 4,237,000 4,161,000 4,137,000 4,017,000 3,933,000 3,941,000 3,937,000 3,523,000 3,313,000 2,757,000 2,508,000 2,315,000 2,200,000 2,111,000 2,045,000 1,993,000 1,842,000 1,656,000 1,623,000 
      total property and equipment
    6,993,510,000 6,967,181,000 6,839,817,000 6,831,402,000 6,696,701,000 6,532,775,000 6,345,054,000 6,249,817,000 6,245,354,000 6,147,165,000 6,009,936,000 5,816,053,000 5,597,022,000 5,423,883,000 5,208,982,000 5,135,625,000 4,965,504,000 4,795,720,000 4,643,191,000 4,591,429,000 4,566,873,000 4,532,891,000 4,479,823,000 4,433,070,000 4,387,603,000 4,294,453,000 4,139,077,000 4,073,152,000 4,003,726,000 3,858,522,000 3,673,648,000 3,579,929,000 3,530,043,000 3,446,345,000 3,335,166,000 3,284,984,000 3,248,435,000 3,211,081,000 3,059,774,000 2,952,825,000 2,890,330,000 2,781,751,000 2,642,662,000 2,574,772,000 2,535,381,000 2,456,416,000 2,347,150,000 2,273,133,000 2,223,721,000 2,160,660,000 2,049,825,000 2,028,224,000 2,003,381,000 1,928,788,000 1,820,487,000 1,748,932,000 1,705,264,000 1,652,492,000 1,544,519,000 1,510,505,000 1,488,426,000 1,473,305,000 1,448,728,000 1,424,743,000 1,376,686,000 1,328,743,000 1,253,429,000 1,181,055,000 1,143,040,000 1,108,694,000 1,086,624,000 1,071,089,000 1,041,977,000 989,461,000 916,482,000 889,041,000 849,312,000 791,920,000 729,175,000 
      less: accumulated depreciation
    -2,407,885,000 -2,376,745,000 -2,342,456,000 -2,325,971,000    -2,154,412,000    -2,128,985,000    -1,919,939,000    -1,677,398,000    -1,464,235,000    -1,318,209,000    -1,175,470,000    -1,043,582,000    -929,377,000    -831,527,000    -730,074,000    -648,919,000    -621,982,000   -580,303,000    -509,233,000    -428,944,000             
      net property and equipment
    4,585,625,000 4,590,436,000 4,497,361,000 4,505,431,000 4,425,753,000 4,277,820,000 4,128,101,000 4,095,405,000 4,085,410,000 4,001,099,000 3,841,464,000 3,687,068,000 3,491,511,000 3,378,732,000 3,225,308,000 3,215,686,000 3,110,114,000 2,998,727,000 2,907,672,000 2,914,031,000 2,935,475,000 2,955,083,000 2,953,990,000 2,968,835,000 2,927,894,000 2,858,171,000 2,761,857,000 2,754,943,000 2,703,275,000 2,585,708,000 2,450,834,000 2,404,459,000 2,367,403,000 2,321,243,000 2,246,286,000 2,241,402,000 2,229,673,000 2,224,883,000 2,098,158,000 2,023,448,000 1,971,210,000 1,891,465,000 1,778,471,000 1,743,245,000 1,730,894,000 1,676,357,000 1,586,076,000 1,543,059,000 1,508,617,000 1,469,392,000 1,375,749,000 1,379,305,000 1,351,358,000 1,282,509,000 1,190,137,000 1,126,950,000 1,103,220,000 1,059,702,000 964,216,000 947,315,000 942,540,000 944,252,000 939,495,000 933,641,000 907,682,000 879,784,000 824,485,000 771,282,000 747,274,000 725,105,000 721,450,000 723,568,000 708,279,000 670,365,000 607,588,000 594,109,000 564,753,000 517,642,000 466,071,000 
      other assets
    267,200,000 262,517,000 259,549,000 265,281,000 265,019,000 258,163,000 259,595,000 273,655,000 259,248,000 247,224,000 218,674,000 217,802,000 208,685,000 206,045,000 216,385,000 222,071,000 224,154,000 224,604,000 220,930,000 212,040,000 180,254,000 136,912,000 130,527,000 140,436,000 138,083,000 139,649,000 138,844,000 64,648,000 70,259,000 68,326,000 58,257,000 59,849,000 56,209,000 54,880,000 54,187,000 52,760,000 46,057,000 43,597,000 42,195,000 41,863,000 47,606,000 45,474,000 42,557,000 40,386,000 43,581,000 45,870,000 37,255,000 36,588,000 43,323,000 41,793,000 41,016,000 38,718,000 38,062,000 36,514,000 36,692,000 34,809,000 31,926,000 34,203,000 33,620,000 31,240,000 34,046,000 30,304,000 20,973,000 20,414,000 18,013,000 15,723,000 15,640,000 16,887,000 19,867,000 17,859,000 19,803,000 16,289,000 13,997,000 29,102,000 28,238,000 28,324,000 27,362,000 27,876,000 25,364,000 
      total assets
    5,516,631,000 5,551,096,000 5,491,294,000 5,491,395,000 5,425,831,000 5,343,096,000 5,651,356,000 5,512,393,000 5,298,874,000 4,978,932,000 4,957,088,000 4,838,610,000 4,811,393,000 4,793,867,000 4,722,650,000 4,821,544,000 4,613,120,000 4,534,446,000 4,351,863,000 4,369,410,000 4,273,688,000 4,080,028,000 3,934,986,000 3,995,568,000 3,892,418,000 3,758,703,000 3,704,042,000 3,545,283,000 3,489,312,000 3,321,082,000 3,144,004,000 3,068,424,000 2,956,170,000 2,840,198,000 2,745,010,000 2,696,247,000 2,684,348,000 2,659,802,000 2,515,440,000 2,466,504,000 2,474,485,000 2,378,067,000 2,340,384,000 2,236,237,000 2,188,539,000 2,124,063,000 2,031,768,000 1,932,089,000 1,904,679,000 1,854,730,000 1,761,192,000 1,712,514,000 1,714,622,000 1,639,644,000 1,574,192,000 1,513,074,000 1,473,198,000 1,409,504,000 1,239,881,000 1,219,081,000 1,202,881,000 1,192,969,000 1,159,278,000 1,174,762,000 1,144,592,000 1,109,053,000 1,074,905,000 1,076,458,000 1,054,106,000 1,007,732,000 981,048,000 981,939,000 956,704,000 933,637,000 892,193,000 889,887,000 865,805,000 709,720,000 641,648,000 
      liabilities and shareholders’ equity
                                                                                   
      current liabilities:
                                                                                   
      accounts payable
    81,923,000 85,675,000 84,240,000 91,819,000 99,279,000 112,606,000 97,689,000 112,774,000 115,712,000 96,661,000 119,773,000 106,275,000 120,160,000 136,480,000 117,850,000 82,519,000 135,044,000 90,956,000 88,452,000 68,511,000 59,229,000 51,257,000 55,097,000 70,254,000 81,269,000 85,125,000 79,397,000 78,518,000 88,150,000 81,668,000 78,498,000 73,729,000 59,702,000 54,234,000 56,843,000 89,216,000 55,145,000 79,230,000 81,079,000 66,774,000 58,258,000 61,042,000 48,955,000 45,314,000 47,285,000 63,783,000 71,764,000 36,788,000 54,512,000 66,718,000 41,471,000 44,891,000 56,930,000 62,540,000 54,677,000 42,096,000 50,707,000 41,157,000 29,221,000 31,166,000 30,639,000 31,503,000 33,468,000 31,404,000 36,258,000 49,219,000 40,999,000 40,308,000 47,805,000 39,359,000 33,341,000 43,901,000 45,452,000 51,136,000 37,686,000 40,414,000 38,440,000 42,112,000 30,967,000 
      compensation and benefits
    282,398,000 256,771,000 233,260,000 285,421,000 283,817,000 259,895,000 232,502,000 278,953,000 278,064,000 249,922,000 220,539,000 288,278,000 293,688,000 264,070,000 223,096,000 257,905,000 244,168,000 245,762,000 209,143,000 191,303,000 217,154,000 190,678,000 176,150,000 192,524,000 201,122,000 191,132,000 174,346,000 198,456,000 193,525,000 177,121,000 157,818,000 152,566,000 151,406,000 145,760,000 126,511,000 129,170,000 140,408,000 130,743,000 118,226,000 124,589,000 144,770,000 134,606,000 125,619,000 106,200,000 123,220,000 107,964,000 97,731,000 97,187,000 97,369,000 89,262,000 81,158,000 80,047,000 78,350,000 75,364,000 69,614,000 66,740,000 70,505,000 76,934,000 51,355,000 68,314,000 61,932,000 48,815,000 31,928,000 46,772,000 44,673,000 41,894,000 43,129,000 53,185,000 49,113,000 41,871,000 38,710,000 41,915,000 40,152,000 35,757,000 35,649,000 38,971,000 37,574,000 31,556,000 27,344,000 
      claims and insurance accruals
    73,242,000 75,110,000 73,407,000 72,846,000 62,119,000 61,271,000 62,839,000 63,346,000 60,616,000 60,837,000 61,714,000 63,307,000 66,228,000 65,241,000 63,229,000 61,822,000 58,253,000 55,620,000 54,304,000 53,092,000 54,493,000 52,469,000 53,768,000 54,330,000 51,613,000 50,803,000 50,570,000 53,263,000 53,783,000 52,168,000 51,792,000 49,949,000 48,089,000 47,897,000 47,693,000 47,417,000 46,376,000 43,549,000 44,497,000 44,917,000 46,356,000 44,734,000 43,964,000 42,271,000 41,948,000 40,764,000 39,525,000 38,784,000 36,307,000 34,070,000 34,681,000 33,990,000 40,659,000 39,804,000 38,040,000 35,934,000 37,563,000 35,789,000 33,927,000 29,811,000 29,532,000 30,338,000 30,689,000 31,656,000 31,105,000 31,500,000 31,181,000 32,066,000 31,919,000 31,949,000 30,255,000 33,132,000 33,469,000 32,756,000 23,871,000 32,020,000 30,216,000 29,541,000 21,728,000 
      other accrued liabilities
    73,954,000 69,307,000 69,167,000 70,443,000 77,230,000 73,015,000 60,930,000 69,585,000 77,958,000 75,598,000 64,626,000 51,933,000 94,154,000 92,510,000 91,135,000 61,988,000 96,826,000 89,680,000 87,019,000 51,513,000 60,141,000 51,464,000 44,597,000 46,130,000 53,728,000 45,897,000 53,842,000 26,495,000 26,999,000 27,510,000 25,872,000 24,805,000 26,745,000 25,841,000 22,315,000 22,833,000 27,045,000 37,829,000 24,944,000 22,634,000 24,411,000 23,635,000 27,250,000 26,139,000 25,826,000 23,837,000 22,756,000 21,480,000 21,995,000 21,329,000 20,904,000 20,906,000 22,375,000 26,950,000 49,851,000 20,686,000 24,011,000 20,404,000 18,413,000 20,515,000 16,468,000 17,174,000 15,364,000 17,546,000 14,588,000 16,428,000 14,909,000 19,025,000 15,892,000 15,014,000 13,224,000 15,363,000 13,120,000 15,665,000 11,643,000 14,039,000 11,738,000 9,209,000 8,981,000 
      income taxes payable
    19,841,000  77,279,000  11,135,000 25,967,000 76,714,000    82,868,000  45,097,000 49,877,000 83,286,000    74,944,000 8,711,000 13,271,000 103,306,000 53,683,000 2,847,000 9,130,000 13,148,000    27,895,000 31,305,000  19,707,000 20,678,000 31,423,000    28,881,000   6,501,000 47,938,000  12,608,000 25,501,000 26,015,000 2,168,000 225,000 23,346,000 37,297,000 6,327,000        1,603,000 4,810,000 7,286,000      1,759,000 1,493,000 1,538,000   2,741,000 4,657,000  2,521,000 5,559,000 8,603,000 4,078,000 
      current maturities of long-term debt
    20,000,000 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000       45,000,000 45,000,000 45,000,000         50,000,000 50,000,000 50,000,000 50,000,000    25,596,000 26,488,000 90,377,000 28,344,000 27,956,000 35,714,000 35,714,000 35,714,000 35,714,000 35,715,000 38,403,000 38,403,000 38,619,000 38,978,000 39,314,000 39,796,000 39,086,000 39,354,000 37,331,000 38,099,000 37,130,000 97,359,000 36,281,000 36,480,000 36,676,000 36,505,000 36,497,000 11,686,000 11,972,000 12,255,000 16,452,000 16,428,000 12,193,000 12,109,000 12,348,000 12,528,000 12,697,000 12,774,000 13,249,000 17,116,000 17,930,000 
      total current liabilities
    551,358,000 506,863,000 557,353,000 540,529,000 553,580,000 552,754,000 550,674,000 544,658,000 552,350,000 503,018,000 569,520,000 529,793,000 639,327,000 628,178,000 578,596,000 464,234,000 534,291,000 482,018,000 513,862,000 373,130,000 449,288,000 494,174,000 428,295,000 366,085,000 396,862,000 386,105,000 358,155,000 356,732,000 362,457,000 366,362,000 345,285,000 351,049,000 355,649,000 344,410,000 334,785,000 288,636,000 268,974,000 291,351,000 323,223,000 285,402,000 364,172,000 298,862,000 321,682,000 255,638,000 286,601,000 297,563,000 293,505,000 232,122,000 248,811,000 273,128,000 254,130,000 225,139,000 237,628,000 244,454,000 251,268,000 204,810,000 220,117,000 212,383,000 170,046,000 248,768,000 179,662,000 171,596,000 148,125,000 163,883,000 163,121,000 150,727,000 142,190,000 158,598,000 162,674,000 146,159,000 127,723,000 146,420,000 147,282,000 152,499,000 121,546,000 140,739,000 136,776,000 138,137,000 111,028,000 
      long-term liabilities:
                                                                                   
      long-term debt
    64,993,000 149,992,000 39,990,000 39,987,000 39,985,000 39,983,000 59,980,000 59,977,000 59,974,000 59,970,000 79,967,000 79,963,000 79,959,000 79,955,000 99,951,000 99,947,000 99,943,000 99,939,000 99,935,000 99,931,000 99,927,000 99,923,000  45,000,000 45,000,000 45,000,000 45,000,000 45,000,000 45,000,000 45,000,000 45,000,000 45,000,000 45,000,000 45,000,000 45,000,000 104,975,000 193,129,000 218,332,000 99,726,000 107,317,000 95,000,000 118,000,000 120,596,000 120,000,000 148,203,000 164,000,000 145,000,000 155,714,000 167,710,000 190,394,000 180,714,000 201,429,000 243,497,000 228,147,000 219,117,000 229,831,000 227,143,000 227,143,000 234,087,000 167,979,000 252,142,000 272,857,000 268,856,000 277,412,000 264,948,000 259,689,000 240,017,000 240,212,000 240,476,000 240,659,000 251,561,000 254,322,000 255,022,000 255,181,000 261,885,000 262,109,000 267,370,000 135,882,000 111,026,000 
      other non-current liabilities
    282,604,000 281,680,000 276,697,000 284,361,000 281,708,000 275,328,000 275,933,000 286,815,000 276,184,000 273,394,000 250,587,000 265,422,000 265,553,000 281,187,000 292,078,000 328,838,000 330,321,000 329,901,000 325,939,000 349,851,000 316,831,000 254,899,000 228,678,000 241,802,000 293,359,000 281,444,000 282,847,000 215,399,000 237,392,000 230,724,000 215,614,000 205,561,000 194,091,000 185,198,000 183,263,000 178,879,000 162,422,000 155,849,000 157,161,000 154,094,000 149,130,000 149,833,000 149,228,000 145,752,000 138,180,000 132,567,000 125,402,000 123,054,000 117,824,000 111,627,000 111,106,000 106,791,000 100,166,000 97,717,000 94,836,000 86,998,000 81,688,000 81,483,000 76,331,000 72,593,000 70,288,000 70,465,000 68,575,000 66,504,000 62,940,000 60,932,000 60,601,000 57,974,000 57,137,000 55,026,000 50,000,000 47,783,000 44,486,000 40,971,000 39,027,000 38,347,000 36,075,000 34,301,000 31,770,000 
      deferred income taxes
    354,480,000 381,930,000 381,930,000 381,930,000 374,818,000 363,132,000 363,132,000 363,132,000 347,243,000 310,515,000 310,515,000 310,515,000 268,384,000 248,718,000 248,718,000 248,718,000 228,667,000 220,210,000 220,210,000 220,210,000 236,809,000 248,564,000 261,964,000 261,964,000 247,669,000 247,669,000 247,669,000 247,669,000 227,531,000 196,945,000 179,354,000 189,960,000 274,414,000 272,599,000 272,599,000 272,599,000 266,348,000 252,501,000 235,054,000 235,054,000 36,646,000 34,648,000 32,994,000 29,371,000 27,110,000 26,722,000 25,726,000 23,249,000 21,975,000 19,605,000 19,324,000 20,054,000 19,518,000 20,768,000 19,650,000 19,466,000 21,833,000 23,262,000 18,666,000 18,212,000 18,175,000 17,895,000 16,244,000 17,977,000 19,060,000 20,656,000 20,268,000 20,416,000 16,183,000 15,799,000 13,964,000 13,365,000 13,675,000 12,614,000 12,320,000 11,298,000 11,802,000 11,817,000 10,681,000 
      total long-term liabilities
    702,077,000 813,602,000 698,617,000 706,278,000 696,511,000 678,443,000 699,045,000 709,924,000 683,401,000 643,879,000 641,069,000 655,900,000 613,896,000 609,860,000 640,747,000 677,503,000 658,931,000 650,050,000 646,084,000 669,992,000 653,567,000 603,386,000 490,642,000 548,766,000 586,028,000 574,113,000 575,516,000 508,068,000 509,923,000 472,669,000 439,968,000 440,521,000 513,505,000 502,797,000 500,862,000 556,453,000 621,899,000 626,682,000 491,941,000 496,465,000 462,900,000 479,442,000 475,441,000 486,535,000 472,211,000 474,682,000 460,294,000 467,885,000 470,942,000 456,825,000 440,540,000 461,406,000 490,506,000 459,744,000 435,310,000 451,745,000 436,445,000 419,116,000 401,186,000 323,720,000 401,005,000 420,672,000 418,153,000 427,560,000 408,647,000 396,224,000 374,586,000 370,779,000 367,710,000 361,732,000 363,873,000 361,779,000 355,692,000 349,947,000 353,027,000 349,369,000 349,353,000 213,512,000 185,569,000 
      total liabilities
    1,253,435,000 1,320,465,000 1,255,970,000 1,246,807,000 1,250,091,000 1,231,197,000 1,249,719,000 1,254,582,000 1,235,751,000 1,146,897,000 1,210,589,000 1,185,693,000 1,253,223,000 1,238,038,000 1,219,343,000 1,141,737,000 1,193,222,000 1,132,068,000 1,159,946,000 1,043,122,000 1,102,855,000 1,097,560,000 918,937,000 914,851,000 982,890,000 960,218,000 933,671,000 864,800,000 872,380,000 839,031,000 785,253,000 791,570,000 869,154,000 847,207,000 835,647,000 845,089,000 890,873,000 918,033,000 815,164,000 781,867,000 827,072,000 778,304,000 797,123,000 742,173,000 758,812,000 772,245,000 753,799,000 700,007,000 719,753,000 729,953,000 694,670,000 686,545,000 728,134,000 704,198,000 686,578,000 656,555,000 656,562,000 631,499,000 571,232,000 572,488,000 580,667,000 592,268,000 566,278,000 591,443,000 571,768,000 546,951,000 516,776,000 529,377,000 530,384,000 507,891,000 491,596,000 508,199,000 502,974,000 502,446,000 474,573,000 490,108,000 486,129,000 351,649,000 296,597,000 
      commitments and contingent liabilities
                                                                             
      shareholders’ equity:
                                                                                   
      common stock - 0.10 par value, 560,000,000 shares authorized, 209,425,614 and 212,984,747 shares outstanding at september 30, 2025 and december 31, 2024, respectively
    20,943,000                                                                               
      capital in excess of par value
    231,592,000 228,625,000 226,576,000 228,081,000 186,985,000 186,584,000 225,497,000 242,958,000 241,022,000 239,039,000 240,024,000 244,590,000 240,790,000 236,991,000 133,172,000 174,445,000 170,340,000 160,204,000 156,126,000 226,451,000 185,991,000 181,895,000 217,187,000 222,430,000 146,085,000 144,938,000 143,123,000 142,176,000 140,841,000 139,557,000 138,921,000 138,359,000 137,533,000 136,707,000 136,171,000 135,466,000 135,000,000 134,536,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 137,275,000 137,275,000 137,275,000 137,275,000 137,275,000 89,026,000 89,026,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 90,893,000 
      retained earnings
    4,010,661,000 3,980,946,000 3,987,555,000 3,995,209,000 3,967,376,000 3,903,839,000 4,154,380,000 4,003,956,000 3,811,183,000 3,582,062,000 3,495,492,000 3,397,305,000 3,306,285,000 3,307,614,000 3,358,759,000 3,493,861,000 3,238,057,000 3,230,593,000 3,024,195,000 3,088,131,000 2,973,109,000 2,788,839,000 2,787,049,000 2,850,318,000 2,755,455,000 2,645,533,000 2,619,141,000 2,530,184,000 2,467,902,000 2,334,286,000 2,211,601,000 2,130,257,000 1,941,245,000 1,848,045,000 1,764,945,000 1,707,450,000 1,650,217,000 1,598,923,000 1,557,510,000 1,541,795,000 1,504,516,000 1,456,812,000 1,400,269,000 1,351,054,000 1,286,710,000 1,208,801,000 1,134,952,000 1,089,065,000 1,041,909,000 981,760,000 923,505,000 882,952,000 843,471,000 792,427,000 744,595,000 713,500,000 673,617,000 634,986,000 574,030,000 551,974,000 527,593,000 506,080,000 498,379,000 488,698,000 478,203,000 467,481,000 463,508,000 452,460,000 429,101,000 405,220,000 394,831,000 379,119,000 359,109,000 336,570,000 322,999,000 305,158,000 285,055,000 263,450,000 250,430,000 
      total shareholders’ equity
    4,263,196,000 4,230,631,000 4,235,324,000 4,244,588,000 4,175,740,000 4,111,899,000 4,401,637,000 4,257,811,000 4,063,123,000 3,832,035,000 3,746,499,000 3,652,917,000 3,558,170,000 3,555,829,000 3,503,307,000 3,679,807,000 3,419,898,000 3,402,378,000 3,191,917,000 3,326,288,000 3,170,833,000 2,982,468,000 3,016,049,000 3,080,717,000 2,909,528,000 2,798,485,000 2,770,371,000 2,680,483,000 2,616,932,000 2,482,051,000 2,358,751,000 2,276,854,000 2,087,016,000 1,992,991,000 1,909,363,000 1,851,158,000 1,793,475,000 1,741,769,000 1,700,276,000 1,684,637,000 1,647,413,000 1,599,763,000 1,543,261,000 1,494,064,000 1,429,727,000 1,351,818,000 1,277,969,000 1,232,082,000 1,184,926,000 1,124,777,000 1,066,522,000 1,025,969,000 986,488,000 935,446,000 887,614,000 856,519,000 816,636,000 778,005,000 668,649,000 646,593,000 622,214,000 600,701,000 593,000,000 583,319,000 572,824,000 562,102,000 558,129,000 547,081,000 523,722,000 499,841,000 489,452,000 473,740,000 453,730,000 431,191,000 417,620,000 399,779,000 379,676,000 358,071,000 345,051,000 
      total liabilities and shareholders’ equity
    5,516,631,000 5,551,096,000 5,491,294,000 5,491,395,000 5,425,831,000 5,343,096,000 5,651,356,000 5,512,393,000 5,298,874,000 4,978,932,000 4,957,088,000 4,838,610,000 4,811,393,000 4,793,867,000 4,722,650,000 4,821,544,000 4,613,120,000 4,534,446,000 4,351,863,000 4,369,410,000 4,273,688,000 4,080,028,000 3,934,986,000 3,995,568,000 3,892,418,000 3,758,703,000 3,704,042,000 3,545,283,000 3,489,312,000 3,321,082,000 3,144,004,000 3,068,424,000 2,956,170,000 2,840,198,000 2,745,010,000 2,696,247,000 2,684,348,000 2,659,802,000 2,515,440,000 2,466,504,000 2,474,485,000 2,378,067,000 2,340,384,000 2,236,237,000 2,188,539,000 2,124,063,000 2,031,768,000 1,932,089,000 1,904,679,000 1,854,730,000 1,761,192,000 1,712,514,000 1,714,622,000 1,639,644,000 1,574,192,000 1,513,074,000 1,473,198,000 1,409,504,000 1,239,881,000 1,219,081,000 1,202,881,000 1,192,969,000 1,159,278,000 1,174,762,000 1,144,592,000 1,109,053,000 1,074,905,000 1,076,458,000 1,054,106,000 1,007,732,000 981,048,000 981,939,000 956,704,000 933,637,000 892,193,000 889,887,000 865,805,000 709,720,000 641,648,000 
      customer receivables, less allowances of 9,366 and 9,272, respectively
     530,466,000                                                                              
      common stock - 0.10 par value, 560,000,000 shares authorized, 210,595,766 and 212,984,747 shares outstanding at june 30, 2025 and december 31, 2024, respectively
     21,060,000                                                                              
      customer receivables, less allowances of 9,509 and 9,272, respectively
      545,584,000                                                                             
      common stock - 0.10 par value, 560,000,000 shares authorized, 211,929,275 and 212,984,747 shares outstanding at march 31, 2025 and december 31, 2024, respectively
      21,193,000                                                                             
      customer receivables, less allowances of 9,272 and 10,405, respectively
       501,554,000                                                                            
      common stock - 0.10 par value, 560,000,000 shares authorized, 212,984,747 and 217,930,932 shares outstanding at december 31, 2024 and december 31, 2023, respectively
       21,298,000                                                                            
      customer receivables, less allowances of 9,563 and 10,405, respectively
        545,746,000                                                                           
      accumulated depreciation
        -2,270,948,000 -2,254,955,000 -2,216,953,000  -2,159,944,000 -2,146,066,000 -2,168,472,000  -2,105,511,000 -2,045,151,000 -1,983,674,000  -1,855,390,000 -1,796,993,000 -1,735,519,000  -1,631,398,000 -1,577,808,000 -1,525,833,000  -1,459,709,000 -1,436,282,000 -1,377,220,000  -1,300,451,000 -1,272,814,000 -1,222,814,000  -1,162,640,000 -1,125,102,000 -1,088,880,000  -1,018,762,000 -986,198,000 -961,616,000  -919,120,000 -890,286,000 -864,191,000  -804,487,000 -780,059,000 -761,074,000  -715,104,000 -691,268,000 -674,076,000  -652,023,000 -646,279,000 -630,350,000  -602,044,000 -592,790,000  -563,190,000 -545,886,000 -529,053,000  -491,102,000 -469,004,000 -448,959,000              
      common stock - 0.10 par value, 560,000,000 shares authorized, 213,794,691 and 217,930,932 shares outstanding at september 30, 2024 and december 31, 2023, respectively
        21,379,000                                                                           
      short-term investments
         30,271,000     24,807,000 49,355,000 158,829,000 224,391,000 279,183,000 254,433,000 224,899,000 165,254,000 310,193,000 330,274,000 205,294,000                                              4,861,000 8,969,000 2,082,000 3,586,000 24,375,000 15,560,000 15,525,000 54,270,000 85,160,000 79,541,000 88,450,000   
      customer receivables, less allowances of 9,989 and 10,405, respectively
         578,101,000                                                                          
      common stock - 0.10 par value, 560,000,000 shares authorized, 214,758,093 and 217,930,932 shares outstanding at june 30, 2024 and december 31, 2023, respectively
         21,476,000                                                                          
      customer receivables, less allowances of 10,137 and 10,405, respectively
          582,209,000                                                                         
      common stock - 0.10 par value, 280,000,000 shares authorized, 217,598,722 and 217,930,932 shares outstanding at march 31, 2024 and december 31, 2023, respectively
          21,760,000                                                                         
      customer receivables, less allowances of 10,405 and 10,689, respectively
           578,885,000                                                                        
      shareholders’ equity
                                                                                   
      common stock - 0.10 par value, 280,000,000 shares authorized, 108,965,466 and 110,222,819 shares outstanding at december 31, 2023 and december 31, 2022, respectively.
           10,897,000                                                                        
      customer receivables, less allowances of 11,432 and 10,689, respectively
            632,874,000                                                                       
      common stock - 0.10 par value, 280,000,000 shares authorized, 109,178,942 and 110,222,819 shares outstanding at september 30, 2023 and december 31, 2022, respectively
            10,918,000                                                                       
      customer receivables, less allowances of 10,016 and 10,689, respectively
             543,767,000                                                                      
      common stock - 0.10 par value, 280,000,000 shares authorized, 109,337,474 and 110,222,819 shares outstanding at june 30, 2023 and december 31, 2022, respectively
             10,934,000                                                                      
      customer receivables, less allowances of 11,069 and 10,689, respectively
              564,490,000                                                                     
      common stock - 0.10 par value, 280,000,000 shares authorized, 109,830,927 and 110,222,819 shares outstanding at march 31, 2023 and december 31, 2022, respectively
              10,983,000                                                                     
      customer receivables, less allowances of 10,689 and 9,855, respectively
               578,648,000                                                                    
      common stock - 0.10 par value, 280,000,000 shares authorized, 110,222,819 and 115,011,172 shares outstanding at december 31, 2022 and december 31, 2021, respectively.
               11,022,000                                                                    
      customer receivables, less allowances of 11,100 and 9,855, respectively
                630,370,000                                                                   
      common stock - 0.10 par value, 280,000,000 shares authorized, 110,954,501 and 115,011,172 shares outstanding at september 30, 2022 and december 31, 2021, respectively
                11,095,000                                                                   
      customer receivables, less allowances of 11,855 and 9,855, respectively
                 680,096,000                                                                  
      common stock - 0.10 par value, 280,000,000 shares authorized, 112,236,107 and 115,011,172 shares outstanding at june 30, 2022 and december 31, 2021, respectively
                 11,224,000                                                                  
      customer receivables, less allowances of 12,118 and 9,855, respectively
                  669,042,000                                                                 
      common stock - 0.10 par value, 280,000,000 shares authorized, 113,761,155 and 115,011,172 shares outstanding at march 31, 2022 and december 31, 2021, respectively
                  11,376,000                                                                 
      customer receivables, less allowances of 9,855 and 8,979, respectively
                   567,474,000                                                                
      common stock - 0.10 par value, 280,000,000 shares authorized, 115,011,172 and 117,057,696 shares outstanding at december 31, 2021 and december 31, 2020, respectively.
                   11,501,000                                                                
      customer receivables, less allowances of 10,348 and 8,979, respectively
                    591,783,000                                                               
      common stock - 0.10 par value, 280,000,000 shares authorized, 115,011,172 and 117,057,696 shares outstanding at september 30, 2021 and december 31, 2020, respectively
                    11,501,000                                                               
      customer receivables, less allowances of 9,915 and 8,979, respectively
                     548,749,000                                                              
      common stock - 0.10 par value, 280,000,000 shares authorized, 115,810,083 and 117,057,696 shares outstanding at june 30, 2021 and december 31, 2020, respectively
                     11,581,000                                                              
      customer receivables, less allowances of 9,498 and 8,979, respectively
                      496,125,000                                                             
      common stock - 0.10 par value, 280,000,000 shares authorized, 115,964,663 and 117,057,696 shares outstanding at march 31, 2021 and december 31, 2020, respectively
                      11,596,000                                                             
      customer receivables, less allowances of 8,979 and 8,866, respectively
                       444,653,000                                                            
      common stock - 0.10 par value, 280,000,000 shares authorized, 117,057,696 shares outstanding at december 31, 2020 and 140,000,000 shares authorized, 119,532,534 shares outstanding at december 31, 2019
                       11,706,000                                                            
      customer receivables, less allowances of 10,286 and 8,866, respectively
                        453,346,000                                                           
      goodwill
                        19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000 19,463,000                   
      common stock - 0.10 par value, 280,000,000 shares authorized, 117,331,447 shares outstanding at september 30, 2020 and 140,000,000 shares authorized, 119,532,534 shares outstanding at december 31, 2019
                        11,733,000                                                           
      customer receivables, less allowances of 9,033 and 8,866, respectively
                         387,260,000                                                          
      common stock - 0.10 par value, 280,000,000 shares authorized, 117,335,353 shares outstanding at june 30, 2020 and 140,000,000 shares authorized, 119,532,534 shares outstanding at december 31, 2019
                         11,734,000                                                          
      customer receivables, less allowances of 9,464 and 8,866, respectively
                          419,128,000                                                         
      common stock - 0.10 par value, 140,000,000 shares authorized, 118,133,507 and 119,532,534 shares outstanding at march 31, 2020 and december 31, 2019, respectively
                          11,813,000                                                         
      customer receivables, less allowances of 8,866 and 9,913, respectively
                           397,579,000                                                        
      common stock - 0.10 par value, 140,000,000 shares authorized, 79,688,356 and 81,231,131 shares outstanding at december 31, 2019 and 2018, respectively
                           7,969,000                                                        
      customer receivables, less allowances of 9,279 and 9,913, respectively
                            425,850,000                                                       
      common stock - 0.10 par value, 140,000,000 shares authorized, 79,884,372 and 81,231,131 shares outstanding at september 30, 2019 and december 31, 2018, respectively
                            7,988,000                                                       
      customer receivables, less allowances of 10,019 and 9,913, respectively
                             449,984,000                                                      
      common stock - 0.10 par value, 140,000,000 shares authorized, 80,138,666 and 81,231,131 shares outstanding at june 30, 2019 and december 31, 2018, respectively
                             8,014,000                                                      
      customer receivables, less allowances of 10,215 and 9,913, respectively
                              447,242,000                                                     
      common stock - 0.10 par value, 140,000,000 shares authorized, 81,071,908 and 81,231,131 shares outstanding at march 31, 2019 and december 31, 2018, respectively
                              8,107,000                                                     
      customer receivables, less allowances of 9,913 and 9,465, respectively
                               427,569,000                                                    
      common stock - 0.10 par value, 140,000,000 shares authorized, 81,231,131 and 82,375,945 shares outstanding at december 31, 2018 and 2017, respectively
                               8,123,000                                                    
      customer receivables, less allowances of 9,916 and 9,465, respectively
                                466,455,000                                                   
      common stock - 0.10 par value, 140,000,000 shares authorized, 81,885,354 and 82,375,945 shares outstanding at september 30, 2018 and december 31, 2017, respectively
                                8,189,000                                                   
      customer receivables, less allowances of 10,033 and 9,465, respectively
                                 456,906,000                                                  
      common stock - 0.10 par value, 140,000,000 shares authorized, 82,079,355 and 82,375,945 shares outstanding at june 30, 2018 and december 31, 2017, respectively
                                 8,208,000                                                  
      customer receivables, less allowances of 9,743 and 9,465, respectively
                                  412,932,000                                                 
      common stock - 0.10 par value, 140,000,000 shares authorized, 82,284,180 and 82,375,945 shares outstanding at march 31, 2018 and december 31, 2017, respectively
                                  8,229,000                                                 
      customer receivables, less allowances of 9,465 and 8,346, respectively
                                   394,169,000                                                
      common stock - 0.10 par value, 140,000,000 shares authorized, 82,375,945 and 82,416,657 shares outstanding at december 31, 2017 and 2016, respectively
                                   8,238,000                                                
      customer receivables, less allowances of 9,315 and 8,346, respectively
                                    391,858,000                                               
      common stock - 0.10 par value, 140,000,000 shares authorized, 82,375,945 and 82,416,657 shares outstanding at september 30, 2017 and december 31, 2016, respectively
                                    8,238,000                                               
      customer receivables, less allowances of 8,443 and 8,346, respectively
                                     363,807,000                                              
      common stock - 0.10 par value, 140,000,000 shares authorized, 82,387,823 and 82,416,657 shares outstanding at june 30, 2017 and december 31, 2016, respectively
                                     8,239,000                                              
      customer receivables, less allowances of 8,711 and 8,346, respectively
                                      332,157,000                                             
      common stock - 0.10 par value, 140,000,000 shares authorized, 82,465,636 and 82,416,657 shares outstanding at march 31, 2017 and december 31, 2016, respectively
                                      8,247,000                                             
      customer receivables, less allowances of 8,346 and 8,976, respectively
                                       320,087,000                                            
      common stock - 0.10 par value, 140,000,000 shares authorized, 82,416,657 and 84,411,878 shares outstanding at december 31, 2016 and 2015, respectively
                                       8,242,000                                            
      customer receivables, less allowances of 8,174 and 8,976, respectively
                                        333,041,000                                           
      common stock - 0.10 par value, 140,000,000 shares authorized, 82,578,641 and 84,411,878 shares outstanding at september 30, 2016 and december 31, 2015, respectively
                                        8,258,000                                           
      customer receivables, less allowances of 7,762 and 8,976, respectively
                                         319,019,000                                          
      common stock - 0.10 par value, 140,000,000 shares authorized, 83,096,036 and 84,411,878 shares outstanding at june 30, 2016 and december 31, 2015, respectively
                                         8,310,000                                          
      customer receivables, less allowances of 8,925 and 8,976, respectively
                                          311,650,000                                         
      common stock - 0.10 par value, 140,000,000 shares authorized, 83,649,398 and 84,411,878 shares outstanding at march 31, 2016 and december 31, 2015, respectively
                                          8,365,000                                         
      customer receivables, less allowances of 8,976 and 9,069, respectively
                                           310,501,000                                        
      common stock - 0.10 par value, 140,000,000 shares authorized, 84,411,878 and 86,094,297 shares outstanding at december 31, 2015 and 2014, respectively
                                           8,441,000                                        
      customer receivables, less allowances of 9,237 and 9,069, respectively
                                            337,706,000                                       
      common stock - 0.10 par value, 140,000,000 shares authorized, 84,967,313 and 86,094,297 shares outstanding at september 30, 2015 and december 31, 2014, respectively
                                            8,496,000                                       
      customer receivables, less allowances of 9,397 and 9,069, respectively
                                             330,091,000                                      
      common stock - 0.10 par value, 140,000,000 shares authorized, 85,506,709 and 86,094,297 shares outstanding at june 30, 2015 and december 31, 2014, respectively
                                             8,550,000                                      
      customer receivables, less allowances of 9,738 and 9,069, respectively
                                              317,705,000                                     
      common stock - 0.10 par value, 140,000,000 shares authorized, 85,913,659 and 86,094,297 shares outstanding at march 31, 2015 and december 31, 2014, respectively
                                              8,591,000                                     
      customer receivables, less allowances of 9,069 and 8,067, respectively
                                               303,170,000                                    
      common stock - 0.10 par value, 140,000,000 shares authorized, 86,094,297 and 86,164,917 shares outstanding at december 31, 2014 and 2013, respectively
                                               8,609,000                                    
      customer receivables, less allowances of 9,471 and 8,067, respectively
                                                322,395,000                                   
      common stock - 0.10 par value, 140,000,000 shares authorized, 86,164,917 shares outstanding at september 30, 2014 and december 31, 2013
                                                8,616,000                                   
      customer receivables, less allowances of 9,415 and 8,067, respectively
                                                 302,262,000                                  
      common stock - 0.10 par value, 140,000,000 shares authorized, 86,164,917 shares outstanding at june 30, 2014 and december 31, 2013
                                                 8,616,000                                  
      customer receivables, less allowances of 8,355 and 8,067, respectively
                                                  285,249,000                                 
      common stock - 0.10 par value, 140,000,000 shares authorized, 86,164,917 shares outstanding at march 31, 2014 and december 31, 2013
                                                  8,616,000                                 
      customer receivables, less allowances of 8,067 and 8,561, respectively
                                                   248,069,000                                
      common stock - 0.10 par value, 140,000,000 shares authorized, 86,164,917 shares outstanding at december 31, 2013 and 2012
                                                   8,616,000                                
      customer receivables, less allowances of 8,712 and 8,561, respectively
                                                    268,223,000                               
      common stock - 0.10 par value, 140,000,000 shares authorized, 86,164,917 shares outstanding at september 30, 2013 and december 31, 2012
                                                    8,616,000                               
      customer receivables, less allowances of 8,318 and 8,561, respectively
                                                     267,690,000                              
      common stock - 0.10 par value, 140,000,000 shares authorized, 86,164,917 shares outstanding at june 30, 2013 and december 31, 2012
                                                     8,616,000                              
      customer receivables, less allowances of 8,302 and 8,561, respectively
                                                      248,225,000                             
      common stock - 0.10 par value, 140,000,000 shares authorized, 86,164,917 shares outstanding at march 31, 2013 and december 31, 2012
                                                      8,616,000                             
      customer receivables, less allowances of 8,561 and 9,173, respectively
                                                       219,039,000                            
      common stock - 0.10 par value, 140,000,000 shares authorized, 86,164,917 and 86,164,986 shares outstanding at december 31, 2012 and 2011, respectively
                                                       8,616,000                            
      customer receivables, less allowances of 9,536 and 9,173, respectively
                                                        248,254,000                           
      common stock - 0.10 par value, 140,000,000 shares authorized; 86,164,917 shares outstanding at september 30, 2012 and 86,164,986 shares outstanding at december 31, 2011
                                                        8,616,000                           
      customer receivables, less allowances of 9,433 and 9,173, respectively
                                                         241,433,000                          
      common stock - 0.10 par value, 140,000,000 shares authorized, 57,443,324 shares outstanding at june 30, 2012 and 70,000,000 shares authorized, 57,443,324 shares outstanding at december 31, 2011
                                                         5,744,000                          
      customer receivables, less allowances of 9,114 and 9,173, respectively
                                                          228,398,000                         
      common stock - 0.10 par value, 70,000,000 shares authorized, 57,443,324 shares outstanding at march 31, 2012 and december 31, 2011
                                                          5,744,000                         
      customer receivables, less allowances of 9,173 and 8,475, respectively
                                                           213,481,000                        
      common stock - 0.10 par value, 70,000,000 shares authorized, 57,443,324 and 55,926,945 shares outstanding at december 31, 2011 and 2010, respectively
                                                           5,744,000                        
      customer receivables, less allowances of 8,993 and 8,475, respectively
                                                            222,525,000                       
      prepaid expenses
                                                            18,807,000 21,312,000 17,766,000 19,143,000 18,179,000 16,221,000 12,842,000 15,600,000 18,214,000 18,311,000 13,461,000 18,018,000 17,414,000 15,683,000 13,449,000 16,132,000 17,711,000 15,350,000 11,332,000 15,556,000 15,988,000 14,903,000 11,347,000 
      common stock - 0.10 par value, 70,000,000 shares authorized, 57,443,324 shares outstanding at september 30, 2011 and 55,926,945 outstanding at december 31, 2010
                                                            5,744,000                       
      customer receivables, less allowances of 8,903 and 8,475, respectively
                                                             212,535,000                      
      common stock - 0.10 par value, 70,000,000 shares authorized, 57,443,324 shares outstanding at june 30, 2011 and 55,926,945 outstanding at december 31, 2010
                                                             5,744,000                      
      customer receivables, less allowances of 8,475 and 11,444, respectively
                                                              172,989,000                     
      common stock - 0.10 par value, 70,000,000 shares authorized, 55,926,945 and 55,927,013 shares outstanding at december 31, 2010 and 2009, respectively
                                                              5,593,000                     
      customer receivables, less allowances of 10,239 and 11,444, respectively
                                                               176,595,000                    
      common stock - 0.10 par value, 70,000,000 shares authorized, 55,926,945 shares outstanding at september 30, 2010 and 55,927,013 outstanding at december 31, 2009
                                                               5,593,000                    
      customer receivables, less allowances of 10,010 and 11,444, respectively
                                                                162,703,000                   
      common stock - 0.10 par value, 70,000,000 shares authorized, 37,284,675 shares outstanding
                                                                3,728,000 3,728,000  3,728,000    3,728,000 3,728,000 3,728,000   3,728,000       
      customer receivables, less allowances of 10,411 and 11,444, respectively
                                                                 148,041,000                  
      intangible assets
                                                                 24,406,000 24,635,000 24,864,000 25,093,000 25,321,000 25,550,000 25,779,000 25,999,000 26,264,000 23,518,000 22,984,000 23,124,000       
      customer receivables, less allowances of 11,444 and 11,735, respectively
                                                                  136,822,000                 
      common stock – 0.10 par value, 70,000,000 shares authorized, 37,284,675 shares outstanding at december 31, 2009 and 2008
                                                                  3,728,000                 
      customer receivables, less allowances of 12,592 and 11,735, respectively
                                                                   150,175,000                
      customer receivables, less allowances of 12,622 and 11,735, respectively
                                                                    144,152,000               
      common stock—0.10 par value, 70,000,000 shares authorized, 37,284,675 shares outstanding
                                                                    3,728,000 3,728,000      3,728,000        
      customer receivables, less allowances of 12,204 and 11,735, respectively
                                                                     138,408,000              
      customer receivables, less allowances of 11,735 and 12,122, respectively
                                                                      139,211,000             
      common stock – 0.10 par value, 70,000,000 shares authorized, 37,284,675 shares outstanding at december 31, 2008 and 2007
                                                                      3,728,000             
      customer receivables, less allowances of 12,679 and 12,122, respectively
                                                                       179,937,000            
      less accumulated depreciation and amortization
                                                                       -409,773,000 -395,766,000 -383,589,000  -347,521,000 -333,698,000 -319,096,000  -294,932,000 -284,559,000 -274,278,000  
      commitments and contingencies
                                                                                   
      customer receivables, less allowances of 12,101 and 12,122, respectively
                                                                        185,236,000           
      customer receivables, less allowances of 11,703 and 12,122, respectively
                                                                         163,303,000          
      customer receivables, less allowances of 12,122 and 10,677, respectively
                                                                          151,627,000         
      less accumulated depreciation
                                                                          -365,174,000    -308,894,000    -263,104,000 
      common stock – 0.10 par value, 70,000,000 shares authorized, 37,284,675 shares outstanding at december 31, 2007 and 2006
                                                                          3,728,000         
      customer receivables, less allowances of 12,380 and 10,677, respectively
                                                                           165,392,000        
      customer receivables, less allowances of 11,974 and 10,677, respectively
                                                                            158,270,000       
      customer receivables, less allowances of 10,519 and 10,677, respectively
                                                                             146,776,000      
      common stock—0.10 par value, 70,000,000 shares authorized, 37,284,675 shares outstanding at
                                                                                   
      march 31, 2007 and december 31, 2006
                                                                             3,728,000      
      customer receivables, less allowances of 10,677 and 8,657, respectively
                                                                              141,087,000     
      common stock - 0.10 par value, 70,000,000 shares authorized, 37,284,675 shares outstanding at december 31, 2006 and 2005
                                                                              3,728,000     
      customer receivables, less allowances of 9,622 and 8,657, respectively
                                                                               153,773,000    
      common stock - 0.10 par value, 70,000,000 shares authorized, 37,284,675 shares outstanding at september 30, 2006 and december 31, 2005, respectively
                                                                               3,728,000    
      customer receivables, less allowances of 9,337 and 8,657, respectively
                                                                                148,952,000   
      common stock—0.10 par value, 70,000,000 shares authorized, 37,284,675 shares outstanding at june 30, 2006 and december 31, 2005, respectively
                                                                                3,728,000   
      customer receivables, less allowances of 8,462 and 8,657, respectively
                                                                                 134,204,000  
      common stock - 0.10 par value, 70,000,000 shares authorized, 37,284,675 shares outstanding at march 31, 2006 and december 31, 2005, respectively
                                                                                 3,728,000  
      customer receivables, less allowances of 8,657 and 8,109, respectively
                                                                                  124,744,000 
      tires on equipment
                                                                                   
      common stock - 0.10 par value, 70,000,000 shares authorized, 37,284,675 shares outstanding at december 31, 2005 and 37,267,853 shares outstanding at december 31, 2004
                                                                                  3,728,000 
    The information provided in this report is taken from www.sec.gov and many other data providers. While we have conducted our best efforts to ensure that the parsed data is accurate, we cannot guarantee its accuracy. Please use caution and understand that any consequences of its use are your own responsibility.