7Baggers

Old Dominion Freight Line, Inc
(NASDAQ:ODFL) 

ODFL stock logo

Old Dominion Freight Line, Inc. operates as a less-than-truckload (LTL) motor carrier in the United States and North America. It provides regional, inter-regional, and national LTL services, including expedited transportation. The company also offers various value-added services, such as container d...

Founded: 1934
Full Time Employees: 21,080
CEO: Greg C. Gantt  
Sector: Industrials
Industry: Trucking

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    Unit: USD2026-03-31 2025-12-31 2025-09-30 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 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 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-12-31 2002-09-30 2002-06-30 
                                                                                                    
      revenue from operations
    1,334,696,000 1,307,296,000 1,406,511,000 1,407,724,000 1,374,858,000 1,385,829,000 1,470,211,000 1,498,697,000 1,460,073,000 1,495,550,000 1,515,277,000 1,413,189,000 1,442,136,000 1,491,659,000 1,603,690,000 1,667,448,000 1,497,280,000 1,410,358,000 1,400,046,000 1,319,409,000 1,126,515,000 1,073,389,000 1,058,166,000 896,210,000 987,364,000 1,009,206,000 1,048,457,000 1,060,666,000 990,782,000 1,026,944,000 1,058,233,000 1,033,498,000 925,020,000 891,117,000 872,987,000 839,912,000 754,096,000 745,738,000 782,611,000 755,435,000 707,733,000 734,572,000 779,474,000 762,151,000 696,245,000 721,048,000 743,586,000 702,987,000 620,276,000 592,470,000 616,458,000 590,304,000 532,575,000 527,345,000 544,493,000 541,505,000 497,140,000 485,132,000 494,475,000 480,255,000 422,679,000 398,972,000 395,981,000 368,250,000 317,795,000 310,924,000 322,763,000 316,175,000 295,143,000 335,836,000 415,874,000 417,840,000 368,174,000 358,685,000 363,298,000 359,617,000 319,942,000 319,419,000 337,569,000 330,812,000 291,631,000 285,211,000 275,076,000 264,346,000 236,770,000 224,036,000 215,117,000 202,129,000 182,769,000 173,976,000 176,873,000 163,817,000 152,865,000 149,712,000 149,931,000 139,669,000 
      yoy
    -2.92% -5.67% -4.33% -6.07% -5.84% -7.34% -2.97% 6.05% 1.24% 0.26% -5.51% -15.25% -3.68% 5.76% 14.55% 26.38% 32.91% 31.39% 32.31% 47.22% 14.09% 6.36% 0.93% -15.50% -0.34% -1.73% -0.92% 2.63% 7.11% 15.24% 21.22% 23.05% 22.67% 19.49% 11.55% 11.18% 6.55% 1.52% 0.40% -0.88% 1.65% 1.88% 4.83% 8.42% 12.25% 21.70% 20.62% 19.09% 16.47% 12.35% 13.22% 9.01% 7.13% 8.70% 10.12% 12.75% 17.62% 21.60% 24.87% 30.42% 33.00% 28.32% 22.68% 16.47% 7.67% -7.42% -22.39% -24.33% -19.84% -6.37% 14.47% 16.19% 15.08% 12.29% 7.62% 8.71% 9.71% 11.99% 22.72% 25.14% 23.17% 27.31% 27.87% 30.78% 29.55% 28.77% 21.62% 23.39% 19.56% 16.21% 17.97% 17.29%     
      qoq
    2.10% -7.05% -0.09% 2.39% -0.79% -5.74% -1.90% 2.65% -2.37% -1.30% 7.22% -2.01% -3.32% -6.99% -3.82% 11.37% 6.16% 0.74% 6.11% 17.12% 4.95% 1.44% 18.07% -9.23% -2.16% -3.74% -1.15% 7.05% -3.52% -2.96% 2.39% 11.73% 3.80% 2.08% 3.94% 11.38% 1.12% -4.71% 3.60% 6.74% -3.65% -5.76% 2.27% 9.47% -3.44% -3.03% 5.78% 13.33% 4.69% -3.89% 4.43% 10.84% 0.99% -3.15% 0.55% 8.92% 2.48% -1.89% 2.96% 13.62% 5.94% 0.76% 7.53% 15.88% 2.21% -3.67% 2.08% 7.13% -12.12% -19.25% -0.47% 13.49% 2.65% -1.27% 1.02% 12.40% 0.16% -5.38% 2.04% 13.44% 2.25% 3.68% 4.06% 11.65% 5.68% 4.15% 6.43% 10.59% 5.05% -1.64% 7.97% 7.16% 2.11% -0.15% 7.35%  
      operating expenses:
                                                                                                    
      salaries, wages and benefits
    638,295,000 642,113,000 663,034,000 672,093,000 658,085,000 655,902,000 681,238,000 683,784,000 668,390,000 670,950,000 663,810,000 642,841,000 652,075,000 655,852,000 675,084,000 705,710,000 680,189,000 661,123,000 649,685,000 611,518,000 545,659,000 543,847,000 524,658,000 460,906,000 524,483,000 534,086,000 533,451,000 532,583,000 522,344,000 515,529,000 536,513,000 522,249,000 501,311,000 482,233,000 461,799,000 441,904,000 416,504,000 417,686,000 425,076,000 408,424,000 400,869,000 407,334,000 406,592,000 387,423,000 368,442,000 366,367,000 363,420,000 340,309,000 311,181,000 308,159,000 303,853,000 287,961,000 270,800,000 269,153,000 270,907,000 268,502,000 257,989,000 248,048,000 247,157,000 239,376,000 221,498,000 218,378,000 213,380,000 196,260,000 180,801,000 176,999,000 183,755,000 181,265,000 176,725,000 185,127,000 209,767,000 208,217,000 201,525,000 191,516,000 196,595,000 187,005,000 176,255,000 172,634,000 179,432,000 170,762,000 160,058,000 159,363,000 148,659,000 143,613,000 134,244,000 124,381,000 120,674,000 115,270,000 108,450,000 104,694,000 102,843,000 97,127,000 91,857,000 89,741,000 88,488,000 83,830,000 
      operating supplies and expenses
    146,718,000 134,447,000 144,185,000 142,457,000 149,892,000 145,651,000 156,177,000 161,020,000 172,472,000 179,916,000 180,653,000 165,373,000 192,384,000 207,626,000 217,260,000 236,712,000 191,357,000 159,373,000 146,509,000 137,577,000 124,156,000 100,057,000 90,269,000 75,412,000 107,693,000 112,004,000 117,343,000 122,410,000 121,357,000 126,026,000 126,024,000 124,919,000 114,061,000 106,688,000 95,543,000 88,580,000 90,987,000 84,093,000 83,197,000 80,335,000 75,372,000 83,781,000 88,669,000 93,390,000 88,049,000 104,794,000 111,670,000 109,917,000 106,294,000 97,591,000 96,792,000 95,115,000 95,703,000 95,895,000 94,732,000 93,691,000 94,216,000 90,435,000 91,421,000 90,697,000 82,633,000 69,271,000 62,746,000 59,594,000 52,680,000 48,935,000 47,994,000 43,814,000 40,586,000 54,733,000 85,999,000 90,859,000 73,567,000 68,665,000 62,310,000 58,414,000 49,490,000 49,638,000 56,265,000 52,929,000 45,554,000 45,402,000 41,929,000 37,606,000 33,092,000 30,486,000 26,360,000 22,979,000 20,835,000 18,533,000 18,052,000 17,341,000 18,158,000 15,881,000 14,869,000 13,694,000 
      general supplies and expenses
    47,069,000 42,530,000 45,075,000 41,676,000 39,880,000 40,559,000 46,040,000 44,371,000 45,576,000 42,520,000 41,745,000 38,606,000 39,545,000 39,418,000 45,951,000 39,116,000 35,513,000 33,152,000 37,312,000 34,427,000 31,168,000 23,407,000 27,383,000 25,881,000 33,608,000 26,391,000 33,633,000 32,391,000 31,560,000 28,104,000 31,209,000 29,891,000 29,976,000 27,793,000 28,785,000 28,283,000 22,872,000 20,696,000 22,010,000 22,778,000 21,142,000 20,133,000 24,350,000 23,533,000 21,292,000 21,210,000 21,931,000 20,889,000 19,135,000 16,054,000 18,311,000 17,639,000 17,761,000 14,312,000 14,507,000 15,937,000 14,152,000 12,485,000 12,648,000 13,201,000 11,566,000 10,429,000 11,136,000 10,443,000 9,985,000 8,333,000 9,620,000 9,089,000 9,321,000 9,331,000 12,284,000 11,864,000 11,195,000 9,836,000 10,336,000 10,604,000 9,299,000 8,911,000 9,496,000 9,790,000 9,310,000 7,755,000 8,153,000 8,384,000 7,648,000 6,924,000 7,020,000 7,114,000 6,392,000 5,953,000 5,900,000 5,764,000 5,374,000 5,655,000 5,133,000 5,256,000 
      operating taxes and licenses
    33,029,000 33,772,000 34,582,000 34,983,000 35,603,000 35,837,000 36,733,000 36,282,000 35,838,000 35,524,000 36,527,000 36,890,000 36,701,000 35,458,000 35,753,000 34,952,000 35,076,000 34,902,000 34,028,000 33,256,000 31,266,000 30,663,000 29,923,000 27,043,000 29,314,000 29,267,000 29,117,000 29,384,000 29,071,000 29,305,000 27,952,000 28,165,000 26,788,000 26,248,000 24,547,000 24,961,000 24,022,000 23,058,000 22,714,000 23,466,000 23,188,000 23,625,000 23,855,000 23,538,000 22,274,000 22,411,000 21,338,000 20,618,000 19,050,000 18,193,000 18,155,000 17,982,000 17,269,000 16,843,000 17,182,000 17,145,000 16,356,000 15,737,000 16,128,000 15,890,000 15,529,000 14,349,000 14,360,000 13,708,000 13,003,000 13,331,000 12,402,000 12,523,000 11,919,000 12,007,000 13,361,000 13,932,000 13,348,000 13,168,000 12,923,000 12,562,000 12,221,000 12,005,000 12,022,000 11,631,000 11,035,000 10,231,000 9,865,000 9,858,000 9,007,000 8,416,000 7,891,000 7,679,000 7,300,000 7,013,000 6,794,000 6,531,000 6,289,000 5,803,000 5,724,000 5,709,000 
      insurance and claims
    17,706,000 19,339,000 18,803,000 18,794,000 17,480,000 39,815,000 17,209,000 17,141,000 18,194,000 27,955,000 16,004,000 15,381,000 16,028,000 7,739,000 17,491,000 16,964,000 16,107,000 9,970,000 15,674,000 14,983,000 12,922,000 9,783,000 11,821,000 10,910,000 9,850,000 18,510,000 11,280,000 11,587,000 11,172,000 9,608,000 12,069,000 11,342,000 11,099,000 12,914,000 10,700,000 9,314,000 8,790,000 8,069,000 10,185,000 9,363,000 10,244,000 6,197,000 10,808,000 10,321,000 10,042,000 8,218,000 10,118,000 9,836,000 7,973,000 7,643,000 8,395,000 7,602,000 7,270,000 6,010,000 8,336,000 7,652,000 7,683,000 4,818,000 8,154,000 7,529,000 7,192,000 6,491,000 7,204,000 6,209,000 5,425,000 4,305,000 6,155,000 5,737,000 6,898,000 11,530,000 8,454,000 6,772,000 8,103,000 6,771,000 6,462,000 9,002,000 11,112,000 8,961,000 6,969,000 8,666,000 8,484,000 5,060,000 6,768,000 8,460,000 7,855,000 7,231,000 6,172,000 6,850,000 5,842,000 4,362,000 4,290,000 4,924,000 4,007,000 3,649,000 4,446,000 4,257,000 
      communications and utilities
    9,622,000 9,272,000 9,568,000 9,296,000 10,803,000 9,618,000 10,056,000 10,158,000 10,995,000 10,013,000 10,724,000 11,515,000 11,017,000 10,522,000 10,288,000 9,898,000 9,876,000 8,825,000 8,738,000 8,390,000 8,196,000 8,467,000 7,622,000 7,262,000 8,191,000 7,530,000 8,098,000 6,134,000 7,839,000 8,370,000 8,215,000 7,439,000 7,046,000 6,809,000 6,490,000 7,022,000 7,433,000 6,547,000 7,025,000 7,327,000 7,005,000 6,770,000 6,867,000 6,501,000 6,775,000 6,351,000 6,320,000 6,102,000 6,734,000 5,927,000 5,726,000 5,768,000 5,721,000 5,424,000 5,003,000 4,699,000 4,854,000 4,603,000 4,518,000 4,433,000 4,550,000 3,955,000 3,820,000 3,668,000 3,775,000 3,402,000 3,659,000 3,593,000 3,960,000 3,927,000 3,819,000 3,692,000 3,907,000 3,585,000 4,109,000 3,447,000 3,882,000 3,351,000 3,442,000 3,683,000 3,802,000 3,177,000 3,016,000 3,166,000 3,214,000 3,130,000 3,030,000 2,537,000 2,844,000 2,922,000 2,705,000 2,513,000 2,371,000 2,645,000 2,481,000 2,708,000 
      depreciation and amortization
    92,307,000 92,669,000 92,219,000 90,663,000 89,132,000 88,808,000 86,666,000 84,563,000 84,531,000 84,649,000 84,055,000 79,784,000 75,947,000 72,053,000 68,347,000 68,310,000 67,340,000 66,789,000 65,160,000 63,947,000 63,987,000 65,106,000 64,983,000 65,735,000 65,435,000 64,544,000 63,493,000 62,571,000 63,073,000 62,555,000 58,086,000 56,235,000 53,481,000 53,093,000 51,934,000 50,449,000 50,287,000 49,574,000 49,041,000 46,480,000 44,772,000 44,223,000 42,561,000 39,771,000 38,788,000 39,546,000 37,707,000 35,121,000 34,092,000 33,807,000 32,914,000 30,517,000 29,834,000 29,948,000 28,727,000 26,524,000 25,544,000 24,290,000 23,396,000 22,013,000 21,121,000 19,862,000 19,396,000 19,553,000 21,551,000 23,801,000 24,036,000 23,948,000 22,999,000 22,356,000 22,045,000 21,513,000 21,169,000 20,813,000 20,556,000 20,062,000 18,432,000 17,865,000 17,476,000 16,756,000 15,537,000 15,183,000 14,716,000 13,663,000 12,335,000 11,785,000 11,536,000 10,906,000 10,596,000 10,129,000 9,949,000 9,447,000 8,685,000 8,151,000 7,735,000 7,741,000 
      purchased transportation
    27,762,000 25,555,000 28,274,000 28,544,000 27,663,000 29,154,000 30,941,000 32,010,000 30,710,000 31,470,000 30,835,000 28,596,000 30,615,000 28,477,000 34,453,000 42,681,000 52,500,000 55,107,000 52,037,000 43,927,000 34,714,000 32,759,000 25,405,000 18,983,000 20,800,000 21,418,000 23,063,000 24,468,000 20,687,000 22,860,000 25,373,000 26,044,000 21,740,000 23,151,000 22,739,000 20,860,000 17,997,000 18,472,000 18,907,000 18,176,000 18,496,000 23,153,000 30,297,000 32,702,000 30,148,000 32,429,000 34,590,000 33,157,000 29,136,000 27,575,000 28,500,000 27,021,000 17,498,000 17,316,000 18,234,000 18,645,000 16,231,000 15,561,000 16,628,000 16,778,000 14,290,000 13,664,000 15,026,000 12,575,000 9,224,000 7,792,000 9,296,000 8,710,000 7,988,000 8,652,000 11,752,000 12,074,000 10,557,000 10,659,000 11,349,000 12,089,000 9,792,000 9,719,000 11,603,000 12,605,000 10,006,000 9,261,000 8,505,000 8,436,000 8,803,000 8,344,000 7,859,000 6,959,000 6,281,000 5,743,000 5,882,000 4,860,000 4,904,000 4,636,000 5,397,000 4,504,000 
      miscellaneous expenses
    4,847,000 3,348,000 9,927,000 11,323,000 8,265,000 6,465,000 3,290,000 7,677,000 6,941,000 -8,458,000 5,905,000 2,609,000 4,775,000 4,285,000 2,983,000 4,400,000 3,704,000 8,626,000 7,493,000 5,340,000 4,790,000 4,998,000 5,858,000 4,912,000 4,820,000 7,192,000 11,452,000 4,649,000 5,253,000 4,351,000 2,874,000 5,086,000 8,303,000 6,861,000 4,557,000 6,125,000 4,968,000 2,663,000 5,002,000 3,486,000 4,824,000 2,961,000 3,226,000 1,599,000 4,592,000 4,644,000 7,350,000 1,830,000 4,123,000 -2,108,000 2,887,000 17,000 1,597,000 1,532,000 2,540,000 2,665,000 2,629,000 2,453,000 2,819,000 2,193,000 2,992,000 1,128,000 1,810,000 2,055,000 1,514,000 1,681,000 2,513,000 2,666,000 1,314,000 1,721,000 2,336,000 2,237,000 366,000 302,000 1,609,000 2,765,000 1,698,000 2,049,000 1,375,000 2,489,000 1,493,000 813,000 2,290,000 3,559,000 1,239,000 2,127,000 1,143,000 1,071,000 1,498,000 -890,000 1,800,000 1,299,000 787,000 1,306,000 1,659,000 1,388,000 
      total operating expenses
    1,017,355,000 1,003,045,000 1,045,667,000 1,049,829,000 1,036,803,000 1,051,809,000 1,068,350,000 1,077,006,000 1,073,647,000 1,074,539,000 1,070,258,000 1,021,595,000 1,059,087,000 1,061,430,000 1,107,610,000 1,158,743,000 1,091,662,000 1,037,867,000 1,016,636,000 953,365,000 856,858,000 819,087,000 787,922,000 697,044,000 804,194,000 820,942,000 830,930,000 826,177,000 812,356,000 808,099,000 829,848,000 813,017,000 775,680,000 747,660,000 709,112,000 679,480,000 645,974,000 632,291,000 645,207,000 621,999,000 608,185,000 620,650,000 639,620,000 621,252,000 592,680,000 608,750,000 617,324,000 580,292,000 540,224,000 515,625,000 518,382,000 492,731,000 466,631,000 459,829,000 463,561,000 458,917,000 442,922,000 421,820,000 426,281,000 415,610,000 384,758,000 361,003,000 352,597,000 328,239,000 301,420,000 292,003,000 302,808,000 294,721,000 285,082,000 313,039,000 373,437,000 374,850,000 347,328,000 328,459,000 329,281,000 318,967,000 294,898,000 287,794,000 300,893,000 292,210,000 268,049,000 258,896,000 246,307,000 239,081,000 219,534,000 204,747,000 193,600,000 183,228,000 171,868,000 160,395,000 160,095,000 151,626,000 144,199,000 139,289,000 137,826,000 130,991,000 
      operating income
    317,341,000 304,251,000 360,844,000 357,895,000 338,055,000 334,020,000 401,861,000 421,691,000 386,426,000 421,011,000 445,019,000 391,594,000 383,049,000 430,229,000 496,080,000 508,705,000 405,618,000 372,491,000 383,410,000 366,044,000 269,657,000 254,302,000 270,244,000 199,166,000 183,170,000 188,264,000 217,527,000 234,489,000 178,426,000 218,845,000 228,385,000 220,481,000 149,340,000 143,457,000 163,875,000 160,432,000 108,122,000 113,447,000 137,404,000 133,436,000 99,548,000 113,922,000 139,854,000 140,899,000 103,565,000 112,298,000 126,262,000 122,695,000 80,052,000 76,845,000 98,076,000 97,573,000 65,944,000 67,516,000 80,932,000 82,588,000 54,218,000 63,312,000 68,194,000 64,645,000 37,921,000 37,969,000 43,384,000 40,011,000 16,375,000 18,921,000 19,955,000 21,454,000 10,061,000 22,797,000 42,437,000 42,990,000 20,846,000 30,226,000 34,017,000 40,650,000 25,044,000 31,625,000 36,676,000 38,602,000 23,582,000 26,315,000 28,769,000 25,265,000 17,236,000 19,289,000 21,517,000 18,901,000 10,901,000 13,581,000 16,778,000 12,191,000 8,666,000 10,423,000 12,105,000 8,678,000 
      yoy
    -6.13% -8.91% -10.21% -15.13% -12.52% -20.66% -9.70% 7.69% 0.88% -2.14% -10.29% -23.02% -5.56% 15.50% 29.39% 38.97% 50.42% 46.48% 41.88% 83.79% 47.22% 35.08% 24.23% -15.06% 2.66% -13.97% -4.75% 6.35% 19.48% 52.55% 39.37% 37.43% 38.12% 26.45% 19.27% 20.23% 8.61% -0.42% -1.75% -5.30% -3.88% 1.45% 10.76% 14.84% 29.37% 46.14% 28.74% 25.75% 21.39% 13.82% 21.18% 18.14% 21.63% 6.64% 18.68% 27.76% 42.98% 66.75% 57.19% 61.57% 131.58% 100.67% 117.41% 86.50% 62.76% -17.00% -52.98% -50.10% -51.74% -24.58% 24.75% 5.76% -16.76% -4.42% -7.25% 5.31% 6.20% 20.18% 27.48% 52.79% 36.82% 36.42% 33.70% 33.67% 58.11% 42.03% 28.25% 55.04% 25.79% 30.30% 38.60% 40.48%     
      qoq
    4.30% -15.68% 0.82% 5.87% 1.21% -16.88% -4.70% 9.13% -8.21% -5.39% 13.64% 2.23% -10.97% -13.27% -2.48% 25.41% 8.89% -2.85% 4.74% 35.74% 6.04% -5.90% 35.69% 8.73% -2.71% -13.45% -7.23% 31.42% -18.47% -4.18% 3.58% 47.64% 4.10% -12.46% 2.15% 48.38% -4.69% -17.44% 2.97% 34.04% -12.62% -18.54% -0.74% 36.05% -7.78% -11.06% 2.91% 53.27% 4.17% -21.65% 0.52% 47.96% -2.33% -16.58% -2.01% 52.33% -14.36% -7.16% 5.49% 70.47% -0.13% -12.48% 8.43% 144.34% -13.46% -5.18% -6.99% 113.24% -55.87% -46.28% -1.29% 106.23% -31.03% -11.14% -16.32% 62.31% -20.81% -13.77% -4.99% 63.69% -10.39% -8.53% 13.87% 46.58% -10.64% -10.35% 13.84% 73.39% -19.73% -19.05% 37.63% 40.68% -16.86% -13.90% 39.49%  
      operating margin %
    23.78% 23.27% 25.66% 25.42% 24.59% 24.10% 27.33% 28.14% 26.47% 28.15% 29.37% 27.71% 26.56% 28.84% 30.93% 30.51% 27.09% 26.41% 27.39% 27.74% 23.94% 23.69% 25.54% 22.22% 18.55% 18.65% 20.75% 22.11% 18.01% 21.31% 21.58% 21.33% 16.14% 16.10% 18.77% 19.10% 14.34% 15.21% 17.56% 17.66% 14.07% 15.51% 17.94% 18.49% 14.87% 15.57% 16.98% 17.45% 12.91% 12.97% 15.91% 16.53% 12.38% 12.80% 14.86% 15.25% 10.91% 13.05% 13.79% 13.46% 8.97% 9.52% 10.96% 10.87% 5.15% 6.09% 6.18% 6.79% 3.41% 6.79% 10.20% 10.29% 5.66% 8.43% 9.36% 11.30% 7.83% 9.90% 10.86% 11.67% 8.09% 9.23% 10.46% 9.56% 7.28% 8.61% 10.00% 9.35% 5.96% 7.81% 9.49% 7.44% 5.67% 6.96% 8.07% 6.21% 
      non-operating expense:
                                                                                                    
      interest expense
    299,000 284,000 4,000 6,000 2,000 25,000 19,000 131,000 37,000 85,000 90,000 89,000 200,000 280,000 997,000 213,000 73,000 384,000 371,000 465,000 507,000 846,000 1,071,000 765,000 100,000 92,000 3,000 160,000 122,000 138,000 29,000 11,000 11,000 362,000 555,000 642,000 595,000 954,000 1,131,000 1,064,000 1,183,000 1,309,000 1,163,000 1,169,000 1,569,000 1,449,000 1,463,000 1,622,000 2,076,000 2,338,000 2,479,000 2,403,000 2,400,000 2,755,000 2,882,000 2,685,000 3,219,000 3,330,000 3,397,000 3,464,000 3,876,000 2,950,000 2,964,000 3,181,000 3,518,000 3,348,000 3,109,000 3,330,000 3,254,000 3,416,000 3,584,000 3,584,000 3,424,000 3,506,000 3,544,000 3,666,000 3,750,000 3,921,000 4,014,000 2,417,000 1,611,000 1,622,000 1,767,000 1,705,000 1,433,000 1,220,000 1,290,000 1,393,000 1,370,000 1,583,000 1,531,000 1,564,000 1,433,000 1,457,000 1,499,000 1,459,000 
      interest income
    -2,280,000 -1,240,000 -559,000 -684,000 -1,662,000 -1,903,000 -1,775,000 -5,961,000 -7,372,000 -5,312,000 -2,308,000 -2,368,000 -2,811,000 -2,951,000 -1,333,000 -471,000 -129,000 -126,000 -178,000 -196,000 -286,000 -228,000 -123,000 -231,000 -1,248,000 -1,797,000 -1,714,000 -1,769,000 -1,483,000 -1,211,000 -778,000 -668,000 -456,000 -408,000 -228,000 -69,000 -35,000 -20,000 -10,000 -12,000 -16,000 -22,000 -33,000 -83,000 -71,000 -30,000 -19,000 -26,000 -33,000 -46,000 -45,000 -42,000 -14,000 -6,000 -22,000 -33,000 -52,000 -144,000 -3,000 -14,000 -19,000 -6,000 -37,000 -53,000 -52,000 -3,000  -14,000 -26,000 -290,000 -230,000 -195,000 -281,000 -327,000 -190,000 -262,000 -727,000 -810,000 -947,000                  
      other expense
    1,644,000 60,000 1,098,000 1,357,000 1,071,000 723,000 523,000 1,075,000 879,000 913,000 861,000 1,947,000 1,511,000 898,000 351,000 750,000 605,000 457,000 266,000 1,387,000 128,000 361,000 961,000 -373,000 3,617,000 375,000 844,000 524,000 -600,000 2,567,000 -70,000 -334,000 2,299,000 -361,000 -977,000 -431,000 409,000 1,192,000 6,000 260,000 516,000 678,000 1,866,000 441,000 237,000 530,000 951,000 35,000 775,000 -518,000 389,000 334,000 74,000 488,000 -289,000 875,000  -521,000 1,678,000 362,000 -1,418,000 -76,000 -178,000 1,029,000 73,000 80,000 -389,000 253,000 284,000 1,479,000 790,000 451,000 672,000 1,566,000 -626,000 -9,000 251,000 81,000 408,000 176,000 271,000 73,000 311,000 250,000 153,000 273,000 97,000 211,000 167,000 -453,000 179,000 -132,000 214,000 10,000 122,000 70,000 
      total non-operating income
    -337,000    -589,000 -1,155,000 -1,233,000 -4,755,000 -6,456,000                                                                                        
      income before income taxes
    317,678,000 305,147,000 360,301,000 357,216,000 338,644,000 335,175,000 403,094,000 426,446,000 392,882,000 425,325,000 446,376,000 391,926,000 384,149,000 432,002,000 496,065,000 508,213,000 405,069,000 371,776,000 382,951,000 364,388,000 269,308,000 253,323,000 268,335,000 199,005,000 180,701,000 189,594,000 218,394,000 235,574,000 180,387,000 217,351,000 229,204,000 221,472,000 147,486,000 143,864,000 164,525,000 160,290,000 107,153,000 111,321,000 136,277,000 132,124,000 97,865,000 111,957,000 136,858,000 139,372,000 101,830,000 110,349,000 123,867,000 121,064,000 77,234,000 75,071,000 95,253,000 94,878,000 63,484,000 64,279,000 78,361,000 79,061,000 51,397,000 60,647,000 63,122,000 60,833,000 35,482,000 35,101,000 40,635,000 35,854,000 12,836,000 15,496,000 17,235,000 17,885,000 6,549,000 18,192,000 38,293,000 39,150,000 17,031,000 22,578,500 31,289,000 37,255,000 21,770,000     16,412,750 26,691,000 23,310,000 15,650,000 17,796,000 20,130,000 17,297,000 9,364,000 12,451,000 15,068,000 10,759,000 7,019,000 8,956,000 10,484,000 7,149,000 
      provision for income taxes
    79,420,000 75,677,000 89,354,000 88,590,000 83,984,000 72,031,000 94,514,000 104,401,000 100,578,000 102,510,000 107,089,000 99,564,000 99,111,000 108,073,000 118,664,000 132,135,000 105,318,000 92,970,000 96,317,000 94,812,000 69,949,000 63,491,000 66,467,000 51,200,000 47,524,000 45,570,000 54,295,000 61,502,000 47,064,000 57,892,000 55,762,000 58,038,000 38,153,000 -53,386,000 62,211,000 61,872,000 41,361,000 42,810,000 50,696,000 50,736,000 37,580,000 39,733,000 52,490,000 53,798,000 39,306,000 40,480,000 45,958,000 47,215,000 31,347,000 27,915,000 35,104,000 36,623,000 22,931,000 24,798,000 27,317,000 31,229,000 20,302,000 20,764,000 24,491,000 21,450,000 13,909,000 13,045,000 16,254,000 14,341,000 5,135,000 5,815,000 6,740,000 7,163,000 2,576,000 7,144,000 14,934,000 15,269,000 6,642,000 9,769,000 11,279,000 14,716,000 8,199,000 10,592,000 13,098,000 14,404,000 8,680,000 9,931,000 10,756,000 9,394,000 6,307,000 7,192,000 7,915,000 6,836,000 3,652,000 4,723,000 5,952,000 4,250,000 2,772,000 3,493,000 4,088,000 2,788,000 
      net income
    238,258,000 229,470,000 270,947,000 268,626,000 254,660,000 263,144,000 308,580,000 322,045,000 292,304,000 322,815,000 339,287,000 292,362,000 285,038,000 323,929,000 377,401,000 376,078,000 299,751,000 278,806,000 286,634,000 269,576,000 199,359,000 189,832,000 201,868,000 147,805,000 133,177,000 144,024,000 164,099,000 174,072,000 133,323,000 159,459,000 173,442,000 163,434,000 109,333,000 197,250,000 102,314,000 98,418,000 65,792,000 68,511,000 85,581,000 81,388,000 60,285,000 72,224,000 84,368,000 85,574,000 62,524,000 69,869,000 77,909,000 73,849,000 45,887,000 47,156,000 60,149,000 58,255,000 40,553,000 39,481,000 51,044,000 47,832,000 31,095,000 39,883,000 38,631,000 39,383,000 21,573,000 22,056,000 24,381,000 21,513,000 7,701,000 9,681,000 10,495,000 10,722,000 3,973,000 11,048,000 23,359,000 23,881,000 10,389,000 15,712,000 20,010,000 22,539,000 13,571,000 17,841,000 20,103,000 21,605,000 13,020,000 14,281,000 15,935,000 13,916,000 9,343,000 10,604,000 12,215,000 10,461,000 5,712,000 7,728,000 9,116,000 6,509,000 4,247,000 5,463,000 6,396,000 4,361,000 
      yoy
    -6.44% -12.80% -12.20% -16.59% -12.88% -18.48% -9.05% 10.15% 2.55% -0.34% -10.10% -22.26% -4.91% 16.18% 31.67% 39.51% 50.36% 46.87% 41.99% 82.39% 49.69% 31.81% 23.02% -15.09% -0.11% -9.68% -5.39% 6.51% 21.94% -19.16% 69.52% 66.06% 66.18% 187.91% 19.55% 20.92% 9.13% -5.14% 1.44% -4.89% -3.58% 3.37% 8.29% 15.88% 36.26% 48.17% 29.53% 26.77% 13.15% 19.44% 17.84% 21.79% 30.42% -1.01% 32.13% 21.45% 44.14% 80.83% 58.45% 83.07% 180.13% 127.83% 132.31% 100.64% 93.83% -12.37% -55.07% -55.10% -61.76% -29.68% 16.74% 5.95% -23.45% -11.93% -0.46% 4.32% 4.23% 24.93% 26.16% 55.25% 39.36% 34.68% 30.45% 33.03% 63.57% 37.22% 34.00% 60.72% 34.49% 41.46% 42.53% 49.25%     
      qoq
    3.83% -15.31% 0.86% 5.48% -3.22% -14.72% -4.18% 10.17% -9.45% -4.85% 16.05% 2.57% -12.01% -14.17% 0.35% 25.46% 7.51% -2.73% 6.33% 35.22% 5.02% -5.96% 36.58% 10.98% -7.53% -12.23% -5.73% 30.56% -16.39% -8.06% 6.12% 49.48% -44.57% 92.79% 3.96% 49.59% -3.97% -19.95% 5.15% 35.01% -16.53% -14.39% -1.41% 36.87% -10.51% -10.32% 5.50% 60.94% -2.69% -21.60% 3.25% 43.65% 2.72% -22.65% 6.72% 53.83% -22.03% 3.24% -1.91% 82.56% -2.19% -9.54% 13.33% 179.35% -20.45% -7.76% -2.12% 169.87% -64.04% -52.70% -2.19% 129.87% -33.88% -21.48% -11.22% 66.08% -23.93% -11.25% -6.95% 65.94% -8.83% -10.38% 14.51% 48.95% -11.89% -13.19% 16.77% 83.14% -26.09% -15.23% 40.05% 53.26% -22.26% -14.59% 46.66%  
      net income margin %
    17.85% 17.55% 19.26% 19.08% 18.52% 18.99% 20.99% 21.49% 20.02% 21.59% 22.39% 20.69% 19.76% 21.72% 23.53% 22.55% 20.02% 19.77% 20.47% 20.43% 17.70% 17.69% 19.08% 16.49% 13.49% 14.27% 15.65% 16.41% 13.46% 15.53% 16.39% 15.81% 11.82% 22.14% 11.72% 11.72% 8.72% 9.19% 10.94% 10.77% 8.52% 9.83% 10.82% 11.23% 8.98% 9.69% 10.48% 10.51% 7.40% 7.96% 9.76% 9.87% 7.61% 7.49% 9.37% 8.83% 6.25% 8.22% 7.81% 8.20% 5.10% 5.53% 6.16% 5.84% 2.42% 3.11% 3.25% 3.39% 1.35% 3.29% 5.62% 5.72% 2.82% 4.38% 5.51% 6.27% 4.24% 5.59% 5.96% 6.53% 4.46% 5.01% 5.79% 5.26% 3.95% 4.73% 5.68% 5.18% 3.13% 4.44% 5.15% 3.97% 2.78% 3.65% 4.27% 3.12% 
      earnings per share:
                                                                                                    
      basic
    1.14 1.1 1.29 1.27 1.2 1.24 1.44 1.49 1.34 2.96 3.11 2.67 2.59 2.94 3.38 3.33 2.62 2.42 2.48 2.33 1.71 1.62 1.72 1.26 1.12 1.81 2.05 2.16 1.65 1.95 2.12 1.99 1.33 2.39 1.24 1.2 0.8 0.83 1.03 0.98 0.72 0.86 0.99 0.73 0.81 0.9 0.86 0.53 0.55 0.7 0.68 0.47 0.46 0.59 0.83 0.54 0.69 0.67 0.69 0.38 0.39 0.44 0.58                     0.38 0.293 0.5  0.24        
      diluted
    1.14 1.1 1.28 1.27 1.19 1.23 1.43 1.48 1.34 2.94 3.09 2.65 2.58 2.92 3.36 3.3 2.6 2.41 2.47 2.31 1.7 1.61 1.71 1.25 1.11 1.81 2.05 2.16 1.64 1.95 2.12 1.99 1.33 2.4 1.24 1.19 0.8 0.83 1.03 0.98 0.72 0.86 0.99 0.73 0.81 0.9 0.86 0.53 0.55 0.7 0.68 0.47 0.46 0.59 0.83 0.54 0.69 0.67 0.69 0.38 0.39 0.44 0.58                     0.38 0.293 0.5  0.24        
      weighted-average shares outstanding:
                                                                                                    
      basic
    208,277 210,535 209,850 211,083 212,402 215,326 214,089 216,369 217,594 109,421,245 109,193 109,521 109,956 112,340,791 111,569,260 113,079,035 114,418,703 115,651,411 115,411,032 115,820,522 116,497,893 117,737,180 117,188,398 117,610,178 119,050,174 80,276,145 79,880,281 80,522,276 81,033,137 81,923,564 81,885,262 82,067,872 82,253,470 82,308,417 82,286,295 82,318,623 82,349,024 83,112,012 82,742,070 83,354,013 83,983,028 85,378,480 85,247,467 85,726,933 85,970,829 86,162,137 86,164,917 86,164,917 86,164,917 86,164,917 86,164,917 86,164,917 86,164,917 86,164,964 86,164,968 57,443,324 57,443,324 57,146,486 57,443,324 57,443,324 56,255,970 55,926,988 55,926,984 37,284,675          37,284,675    37,284,675 37,284,675 37,284,675 37,284,675 37,272,892 24,847,436 24,845,235 24,845,235 24,406,831 24,600,431 24,093,607 24,089,028 16,044,627 16,053,447 16,041,801 10,682,606 8,625,868 8,317,549 8,316,674 
      diluted
    209,317 211,598 210,898 212,164 213,484 216,485 215,227 217,541 218,808 110,090,212 109,835 110,199 110,679 113,077,820 112,294,938 113,805,149 115,172,776 116,409,989 116,161,555 116,561,242 117,255,740 118,493,203 117,933,440 118,359,884 119,805,572 80,406,399 79,989,435 80,645,364 81,143,554 82,019,781 81,975,774 82,169,552 82,356,048 82,407,068 82,380,936 82,427,975 82,444,458 83,153,659 82,811,371 83,381,429 83,983,028 85,378,480 85,247,467 85,726,933 85,970,829 86,162,137 86,164,917 86,164,917 86,164,917 86,164,917 86,164,917 86,164,917 86,164,917 86,164,964 86,164,968 57,443,324 57,443,324 57,146,486 57,443,324 57,443,324 56,255,970 55,926,988 55,926,984 37,284,675          37,284,675    37,284,675 37,284,675 37,284,675 37,284,675 37,276,322 24,848,697 24,854,750 24,855,039 24,423,397 24,616,231 24,112,234 24,110,532 16,063,113 16,070,851 16,061,058 10,698,008 8,643,123 8,322,467 8,321,377 
      dividend declared per share
    0.29                                                                                                
      total non-operating expense
     158,250 543,000 679,000      -4,314,000 -1,357,000 -332,000 -1,100,000 -1,773,000 15,000 492,000 549,000 715,000 459,000 1,656,000 349,000 979,000 1,909,000 161,000 2,469,000 -1,330,000 -867,000 -1,085,000 -1,961,000 1,494,000 -819,000 -991,000 1,854,000 -407,000 -650,000 142,000 969,000 2,126,000 1,127,000 1,312,000 1,683,000 1,965,000 2,996,000 1,527,000 1,735,000 1,949,000 2,395,000 1,631,000 2,818,000 1,774,000 2,823,000 2,695,000 2,460,000 3,237,000 2,571,000 3,527,000 2,821,000 2,665,000 5,072,000 3,812,000 2,439,000 2,868,000 2,749,000 4,157,000 3,539,000 3,425,000 2,720,000 3,569,000 3,512,000 4,605,000 4,144,000 3,840,000 3,815,000 4,745,000 2,728,000 3,395,000 3,274,000 3,192,000 3,475,000                  
      dividends declared per share
     0.28 0.28 0.28 0.28 0.26 0.26 0.26 0.26 0.4 0.4 0.4 0.4 0.3 0.3 0.3 0.3 0.2 0.2 0.2 0.2 0.15 0.15 0.15 0.15 0.17 0.17 0.17 0.17 0.13 0.13 0.13 0.13 0.1 0.1 0.1 0.1                                                            
      building and office equipment rents
                                 1,391,000 1,533,000 1,647,000 1,875,000 1,870,000 2,018,000 1,982,000 2,114,000 1,433,000 2,050,000 2,164,000 2,273,000 2,473,000 2,395,000 2,474,000 2,278,000 2,780,000 2,880,000 2,513,000 2,506,000 2,784,000 2,849,000 3,109,000 3,178,000 3,396,000 3,393,000 3,457,000 3,268,000 3,390,000 3,412,000 3,500,000 3,387,000 3,476,000 3,719,000 4,174,000 3,462,000 3,424,000 3,378,000 3,376,000 3,372,000 3,655,000 3,620,000 3,690,000 3,591,000 3,144,000 3,032,000 3,017,000 2,717,000 2,661,000 2,813,000 2,899,000 2,770,000 2,651,000 2,406,000 2,336,000 2,097,000 1,923,000 1,915,000 1,863,000 1,830,000 1,936,000 1,880,000 1,820,000 1,767,000 1,822,000 1,894,000 1,904,000 
      other income
                                                            -346,000                                        
      basic and diluted earnings per share
                                                                    0.21 0.26 0.28 0.29 0.11 0.29 0.63 0.64 0.28 0.378 0.54 0.6 0.36 0.368 0.54 0.58 0.35            0.4    
      weighted-average shares outstanding:
                                                                                                    
      basic and diluted
                                                                    37,284,675  37,284,675 37,284,675 37,284,675  37,284,675 37,284,675 37,284,675  37,284,675 37,284,675 37,284,675                    
      income before income taxes and cumulative effect of accounting change
                                                                                 28,433,000 33,201,000 36,009,000 21,700,000                
      income before cumulative effect of accounting change
                                                                                 17,841,000 20,103,000 21,605,000 13,020,000                
      cumulative effect of accounting change
                                                                                                    
      other deductions:
                                                                                                    
      total other deductions
                                                                                   2,593,000 1,882,000 1,695,000 2,078,000 1,955,000 1,586,000 1,493,000 1,387,000 1,604,000 1,537,000 1,130,000 1,710,000 1,432,000 1,647,000 1,467,000 1,621,000 1,529,000 
      basic and diluted earnings per share:
                                                                                     0.395 0.64 0.56    0.43  0.31 0.57 0.41  0.39 0.77 0.52 
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-12-31 2025-09-30 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 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 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-12-31 2002-09-30 2002-06-30 
                                                                                                      
        assets
                                                                                                      
        current assets:
                                                                                                      
        cash and cash equivalents
      288,082,000 120,091,000 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 88,143,000 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 6,403,000 1,037,000 2,539,000 742,000 3,094,000 1,180,000 1,054,000 1,051,000 8,592,000 949,000 6,549,000 19,259,000 829,000 1,075,000 
        customer receivables, less allowances of 9,007 and 7,924, respectively
      542,208,000                                                                                                
        other receivables
      24,297,000 22,392,000 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 1,907,000 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 2,442,000 2,362,000 2,151,000 2,543,000 2,246,000 1,548,000 2,091,000 2,542,000 3,092,000 2,641,000 1,645,000 4,162,000 731,000 684,000 
        prepaid expenses and other current assets
      71,661,000 80,403,000 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
      926,248,000 694,833,000 663,806,000 698,143,000 734,384,000 720,683,000 735,059,000 807,113,000 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 1,138,496,000 968,570,000 831,006,000 866,834,000 806,978,000 741,420,000 783,878,000 706,229,000 696,315,000 647,585,000 615,450,000 584,653,000 513,095,000 444,612,000 425,074,000 382,622,000 389,155,000 371,859,000 355,624,000 381,730,000 436,206,000 421,665,000 499,893,000 433,143,000 394,601,000 382,373,000 388,974,000 332,979,000 333,276,000 324,082,000 324,964,000 275,028,000 305,739,000 301,158,000 327,900,000 331,852,000 318,589,000 296,136,000 330,337,000 222,582,000 221,063,000 206,832,000 194,007,000 174,175,000 195,843,000 193,804,000 188,225,000 209,230,000 262,510,000 260,966,000 238,504,000 216,277,000 219,098,000 211,304,000 234,170,000 256,367,000 267,454,000 273,690,000 164,202,000 150,213,000 165,786,000 155,704,000 145,001,000 127,171,000 122,652,000 115,616,000 107,869,000 101,370,000 107,791,000 93,870,000 101,674,000 114,545,000 84,401,000 80,266,000 
        property and equipment:
                                                                                                      
        revenue equipment
      2,683,339,000 2,678,446,000 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 1,014,041,000 981,823,000 919,300,000 922,030,000 936,909,000 894,399,000 833,599,000 789,984,000 782,272,000 758,953,000 729,271,000 701,648,000 683,067,000 684,589,000 684,924,000 668,427,000 673,977,000 673,457,000 653,447,000 601,250,000 603,815,000 606,241,000 579,898,000 577,385,000 575,325,000 571,571,000 537,989,000 494,046,000 497,133,000 473,620,000 443,978,000 400,910,000 387,487,000 371,905,000 343,985,000 311,405,000 307,305,000 301,972,000 270,472,000 263,698,000 263,471,000 262,154,000 246,171,000 229,478,000 230,004,000 218,590,000 
        land and structures
      3,549,041,000 3,523,364,000 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 1,012,028,000 990,256,000 952,383,000 927,809,000 893,720,000 874,768,000 832,378,000 803,647,000 767,513,000 738,359,000 721,046,000 696,497,000 676,862,000 667,917,000 655,998,000 638,037,000 625,417,000 619,477,000 593,617,000 551,503,000 528,572,000 434,821,000 439,078,000 403,398,000 393,771,000 377,557,000 366,108,000 343,337,000 331,849,000 308,537,000 281,389,000 264,686,000 241,158,000 228,909,000 215,920,000 210,850,000 206,892,000 198,194,000 193,557,000 191,321,000 188,826,000 177,597,000 162,367,000 153,566,000 144,501,000 142,350,000 129,619,000 127,016,000 
        other fixed assets
      664,050,000 664,015,000 688,998,000 682,559,000 700,019,000 700,188,000 679,196,000 655,854,000 642,377,000 623,164,000 637,447,000 613,381,000 605,301,000 550,442,000 568,131,000 543,806,000 530,304,000 512,340,000 502,907,000 493,870,000 481,364,000 475,264,000 495,268,000 491,902,000 486,408,000 482,425,000 487,635,000 477,870,000 463,326,000 454,432,000 450,992,000 451,237,000 441,957,000 432,146,000 427,271,000 419,188,000 416,431,000 402,482,000 396,851,000 389,458,000 375,260,000 365,673,000 362,740,000 353,932,000 335,706,000 321,310,000 320,084,000 295,555,000 285,052,000 266,563,000 251,125,000 244,868,000 230,754,000 225,298,000 228,100,000 224,824,000 213,548,000 214,816,000 196,027,000 192,507,000 179,909,000 170,533,000 167,152,000 161,563,000 158,803,000 156,687,000 153,132,000 147,793,000 142,783,000 213,421,000 134,639,000 130,088,000 132,268,000 129,174,000 127,341,000 124,869,000 117,512,000 111,854,000 108,526,000 109,164,000 105,128,000 97,733,000 97,654,000 94,633,000 89,372,000 84,941,000 82,296,000 83,134,000 74,742,000 70,146,000       
        leasehold improvements
      15,621,000 15,654,000 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 4,455,000 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 1,561,000 1,400,000 1,247,000 1,103,000 948,000 1,665,000 1,600,000 1,584,000 1,535,000 1,512,000 1,491,000 1,267,000 4,737,000 4,732,000 
        total property and equipment
      6,912,051,000 6,881,479,000 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 1,590,497,000 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 1,041,977,000 989,461,000 916,482,000 889,041,000 849,312,000 791,920,000 729,175,000 702,622,000 678,788,000 641,496,000 595,643,000 584,106,000 578,092,000 535,640,000 513,025,000 495,819,000 484,501,000 455,297,000 430,944,000 418,225,000 399,193,000 
        less: accumulated depreciation
      -2,444,668,000 -2,377,275,000 -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
      4,467,383,000 4,504,204,000 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 1,000,574,000 964,216,000 947,315,000 942,540,000 944,252,000 939,495,000 933,641,000 907,682,000 879,784,000 824,485,000 771,282,000 747,274,000 725,105,000 721,450,000 723,568,000 708,279,000 670,365,000 607,588,000 594,109,000 564,753,000 517,642,000 466,071,000 450,179,000 431,201,000 399,217,000 363,268,000 361,532,000 363,093,000 328,387,000 315,768,000 307,288,000 299,210,000 275,638,000 255,827,000 248,291,000 235,703,000 
        other assets
      263,317,000 271,123,000 267,200,000 262,517,000 259,549,000 265,281,000 265,019,000 258,163,000 259,595,000 273,655,000 259,248,000 247,224,000 218,674,000 217,802,000 208,685,000 206,045,000 216,385,000 222,071,000 224,154,000 224,604,000 220,930,000 212,040,000 180,254,000 136,912,000 130,527,000 140,436,000 138,083,000 139,649,000 138,844,000 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 33,528,000 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 24,123,000 23,764,000 21,918,000 18,928,000 17,990,000 17,731,000 17,565,000 17,421,000 20,737,000 21,156,000 19,912,000 19,106,000 19,306,000 18,997,000 
        total assets
      5,656,948,000 5,470,160,000 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 1,383,902,000 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 1,007,732,000 981,048,000 981,939,000 956,704,000 933,637,000 892,193,000 889,887,000 865,805,000 709,720,000 641,648,000 640,088,000 610,669,000 566,136,000 509,367,000 502,174,000 496,440,000 453,821,000 434,559,000 435,816,000 414,236,000 397,224,000 389,478,000 351,998,000 334,966,000 
        liabilities and shareholders’ equity
                                                                                                      
        current liabilities:
                                                                                                      
        accounts payable
      94,006,000 62,696,000 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 48,929,000 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 35,679,000 29,949,000 32,292,000 28,126,000 26,873,000 31,311,000 22,771,000 12,185,000 19,237,000 15,867,000 17,764,000 16,841,000 19,231,000 22,973,000 
        compensation and benefits
      240,987,000 239,122,000 282,398,000 256,771,000 233,260,000 285,421,000 283,817,000 259,895,000 232,502,000 278,953,000 278,064,000 249,922,000 220,539,000 288,278,000 293,688,000 264,070,000 223,096,000 257,905,000 244,168,000 245,762,000 209,143,000 191,303,000 217,154,000 190,678,000 176,150,000 192,524,000 201,122,000 191,132,000 174,346,000 198,456,000 193,525,000 177,121,000 157,818,000 152,566,000 151,406,000 145,760,000 126,511,000 129,170,000 140,408,000 130,743,000 118,226,000 124,589,000 144,770,000 134,606,000 125,619,000 106,200,000 123,220,000 107,964,000 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 71,121,000 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 28,913,000 33,836,000 30,815,000 20,382,000 25,731,000 25,601,000 21,239,000 19,626,000 21,280,000 18,756,000 16,636,000 14,719,000 16,532,000 14,250,000 
        claims and insurance accruals
      79,225,000 78,864,000 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 34,335,000 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 26,657,000 24,633,000 22,983,000 22,051,000 21,791,000 20,980,000 19,808,000 17,742,000 18,523,000 18,045,000 17,554,000 17,143,000 18,034,000 17,694,000 
        other accrued liabilities
      68,060,000 70,078,000 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 20,459,000 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 9,599,000 9,092,000 7,747,000 4,491,000 6,112,000 5,247,000 6,739,000 4,603,000 4,629,000 4,256,000 4,487,000 3,288,000 4,065,000 3,141,000 
        income taxes payable
      89,446,000 13,146,000 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       15,421,000  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 2,498,000 2,998,000 7,514,000 1,374,000  2,730,000 4,357,000 1,736,000     1,000,000 222,000 
        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 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 36,773,000 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 19,124,000 19,451,000 19,380,000 22,030,000 22,046,000 22,094,000 21,897,000 22,440,000 22,671,000 17,747,000 17,798,000 11,139,000 24,009,000 17,195,000 
        total current liabilities
      591,724,000 483,906,000 551,358,000 506,863,000 557,353,000 540,529,000 553,580,000 552,754,000 550,674,000 544,658,000 552,350,000 503,018,000 569,520,000 529,793,000 639,327,000 628,178,000 578,596,000 464,234,000 534,291,000 482,018,000 513,862,000 373,130,000 449,288,000 494,174,000 428,295,000 366,085,000 396,862,000 386,105,000 358,155,000 356,732,000 362,457,000 366,362,000 345,285,000 351,049,000 355,649,000 344,410,000 334,785,000 288,636,000 268,974,000 291,351,000 323,223,000 285,402,000 364,172,000 298,862,000 321,682,000 255,638,000 286,601,000 297,563,000 293,505,000 232,122,000 248,811,000 273,128,000 254,130,000 225,139,000 237,628,000 244,454,000 251,268,000 204,810,000 220,117,000 212,383,000 227,038,000 170,046,000 248,768,000 179,662,000 171,596,000 148,125,000 163,883,000 163,121,000 150,727,000 142,190,000 158,598,000 162,674,000 146,159,000 127,723,000 146,420,000 147,282,000 152,499,000 121,546,000 140,739,000 136,776,000 138,137,000 111,028,000 122,470,000 119,959,000 120,731,000 98,454,000 102,553,000 107,963,000 96,811,000 78,332,000 86,340,000 74,671,000 74,239,000 63,130,000 82,871,000 75,475,000 
        long-term liabilities:
                                                                                                      
        long-term debt
      19,996,000 19,995,000 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 95,000,000 118,000,000 120,596,000 120,000,000 148,203,000 164,000,000 145,000,000 155,714,000 167,710,000 190,394,000 180,714,000 201,429,000 243,497,000 228,147,000 219,117,000 229,831,000 227,143,000 227,143,000 252,143,000 234,087,000 167,979,000 252,142,000 272,857,000 268,856,000 277,412,000 264,948,000 259,689,000 240,017,000 240,212,000 240,476,000 240,659,000 251,561,000 254,322,000 255,022,000 255,181,000 261,885,000 262,109,000 267,370,000 135,882,000 111,026,000 120,505,000 111,557,000 82,695,000 57,424,000 58,957,000 85,216,000 68,884,000 74,986,000 76,665,000 82,589,000 73,203,000 82,084,000 83,815,000 81,328,000 
        other non-current liabilities
      274,823,000 284,519,000 282,604,000 281,680,000 276,697,000 284,361,000 281,708,000 275,328,000 275,933,000 286,815,000 276,184,000 273,394,000 250,587,000 265,422,000 265,553,000 281,187,000 292,078,000 328,838,000 330,321,000 329,901,000 325,939,000 349,851,000 316,831,000 254,899,000 228,678,000 241,802,000 293,359,000 281,444,000 282,847,000 215,399,000 237,392,000 230,724,000 215,614,000 205,561,000 194,091,000 185,198,000 183,263,000 178,879,000 162,422,000 155,849,000 157,161,000 154,094,000 149,130,000 149,833,000 149,228,000 145,752,000 138,180,000 132,567,000 125,402,000 123,054,000 117,824,000 111,627,000 111,106,000 106,791,000 100,166,000 97,717,000 94,836,000 86,998,000 81,688,000 81,483,000 77,016,000 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 25,227,000 24,787,000 23,516,000 22,646,000 20,962,000 19,971,000 18,632,000 17,437,000 16,665,000 15,964,000 15,356,000 14,846,000 14,842,000 14,100,000 
        deferred income taxes
      370,683,000 370,683,000 354,480,000 381,930,000 381,930,000 381,930,000 374,818,000 363,132,000 363,132,000 363,132,000 347,243,000 310,515,000 310,515,000 310,515,000 268,384,000 248,718,000 248,718,000 248,718,000 228,667,000 220,210,000 220,210,000 220,210,000 236,809,000 248,564,000 261,964,000 261,964,000 247,669,000 247,669,000 247,669,000 247,669,000 227,531,000 196,945,000 179,354,000 189,960,000 274,414,000 272,599,000 272,599,000 272,599,000 266,348,000 252,501,000 235,054,000 235,054,000 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 21,627,000 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 5,612,000 6,601,000 5,638,000 4,602,000 4,599,000 5,451,000 5,384,000 4,539,000 4,567,000 3,670,000 3,670,000 3,670,000 873,000 873,000 
        total long-term liabilities
      665,502,000 675,197,000 702,077,000 813,602,000 698,617,000 706,278,000 696,511,000 678,443,000 699,045,000 709,924,000 683,401,000 643,879,000 641,069,000 655,900,000 613,896,000 609,860,000 640,747,000 677,503,000 658,931,000 650,050,000 646,084,000 669,992,000 653,567,000 603,386,000 490,642,000 548,766,000 586,028,000 574,113,000 575,516,000 508,068,000 509,923,000 472,669,000 439,968,000 440,521,000 513,505,000 502,797,000 500,862,000 556,453,000 621,899,000 626,682,000 491,941,000 496,465,000 462,900,000 479,442,000 475,441,000 486,535,000 472,211,000 474,682,000 460,294,000 467,885,000 470,942,000 456,825,000 440,540,000 461,406,000 490,506,000 459,744,000 435,310,000 451,745,000 436,445,000 419,116,000 418,242,000 401,186,000 323,720,000 401,005,000 420,672,000 418,153,000 427,560,000 408,647,000 396,224,000 374,586,000 370,779,000 367,710,000 361,732,000 363,873,000 361,779,000 355,692,000 349,947,000 353,027,000 349,369,000 349,353,000 213,512,000 185,569,000 186,846,000 175,923,000 144,534,000 119,385,000 118,845,000 139,670,000 118,757,000 123,686,000 125,020,000 124,408,000 114,414,000 122,785,000 119,438,000 116,209,000 
        total liabilities
      1,257,226,000 1,159,103,000 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 1,097,560,000 918,937,000 914,851,000 982,890,000 960,218,000 933,671,000 864,800,000 872,380,000 839,031,000 785,253,000 791,570,000 869,154,000 847,207,000 835,647,000 845,089,000 890,873,000 918,033,000 815,164,000 781,867,000 827,072,000 778,304,000 797,123,000 742,173,000 758,812,000 772,245,000 753,799,000 700,007,000 719,753,000 729,953,000 694,670,000 686,545,000 728,134,000 704,198,000 686,578,000 656,555,000 656,562,000 631,499,000 645,280,000 571,232,000 572,488,000 580,667,000 592,268,000 566,278,000 591,443,000 571,768,000 546,951,000 516,776,000 529,377,000 530,384,000 507,891,000 491,596,000 508,199,000 502,974,000 502,446,000 474,573,000 490,108,000 486,129,000 351,649,000 296,597,000 309,316,000 295,882,000 265,265,000 217,839,000 221,398,000 247,633,000 215,568,000 202,018,000 211,360,000      
        commitments and contingent liabilities
                                                                                                      
        shareholders’ equity:
                                                                                                      
        common stock - 0.10 par value, 560,000,000 shares authorized, 208,146,920 and 208,556,788 shares outstanding at march 31, 2026 and december 31, 2025, respectively
      20,815,000                                                                                                
        capital in excess of par value
      234,342,000 234,597,000 231,592,000 228,625,000 226,576,000 228,081,000 186,985,000 186,584,000 225,497,000 242,958,000 241,022,000 239,039,000 240,024,000 244,590,000 240,790,000 236,991,000 133,172,000 174,445,000 170,340,000 160,204,000 156,126,000 226,451,000 185,991,000 181,895,000 217,187,000 222,430,000 146,085,000 144,938,000 143,123,000 142,176,000 140,841,000 139,557,000 138,921,000 138,359,000 137,533,000 136,707,000 136,171,000 135,466,000 135,000,000 134,536,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 134,401,000 137,275,000 137,275,000 137,275,000 137,275,000 137,275,000 137,275,000 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 92,137,000 92,088,000 92,088,000 92,088,000 91,941,000 72,261,000 72,972,000 72,972,000 72,615,000 72,433,000 72,892,000 72,135,000 23,957,000 23,946,000 
        retained earnings
      4,144,565,000 4,055,604,000 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 1,041,909,000 981,760,000 923,505,000 882,952,000 843,471,000 792,427,000 744,595,000 713,500,000 673,617,000 634,986,000 595,603,000 574,030,000 551,974,000 527,593,000 506,080,000 498,379,000 488,698,000 478,203,000 467,481,000 463,508,000 452,460,000 429,101,000 405,220,000 394,831,000 379,119,000 359,109,000 336,570,000 322,999,000 305,158,000 285,055,000 263,450,000 250,430,000 236,149,000 220,214,000 206,298,000 196,955,000 186,351,000 174,136,000 163,675,000 157,963,000 150,235,000 141,119,000 134,610,000 130,363,000 124,900,000 118,504,000 
        total shareholders’ equity
      4,399,722,000 4,311,057,000 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 1,025,969,000 986,488,000 935,446,000 887,614,000 856,519,000 816,636,000 778,005,000 738,622,000 668,649,000 646,593,000 622,214,000 600,701,000 593,000,000 583,319,000 572,824,000 562,102,000 558,129,000 547,081,000 523,722,000 499,841,000 489,452,000 473,740,000 453,730,000 431,191,000 417,620,000 399,779,000 379,676,000 358,071,000 345,051,000 330,772,000 314,787,000 300,871,000 291,528,000 280,776,000 248,807,000 238,253,000 232,541,000 224,456,000 215,157,000 208,571,000 203,563,000   
        total liabilities and shareholders’ equity
      5,656,948,000 5,470,160,000 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 1,383,902,000 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 1,007,732,000 981,048,000 981,939,000 956,704,000 933,637,000 892,193,000 889,887,000 865,805,000 709,720,000 641,648,000 640,088,000 610,669,000 566,136,000 509,367,000 502,174,000 496,440,000 453,821,000 434,559,000 435,816,000 414,236,000 397,224,000 389,478,000   
        customer receivables, less allowances of 7,924 and 9,272, respectively
       471,947,000                                                                                               
        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                                                                               
        common stock - 0.10 par value, 560,000,000 shares authorized, 208,556,788 and 212,984,747 shares outstanding at december 31, 2025 and december 31, 2024, respectively
       20,856,000                                                                                               
        customer receivables, less allowances of 9,106 and 9,272, respectively
        518,970,000                                                                                              
        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                                                                                              
        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 -589,923,000  -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 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 21,966,000 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 14,264,000 13,362,000 12,554,000 14,238,000 8,603,000 9,930,000 9,475,000 11,369,000 7,146,000 8,629,000 10,525,000 15,623,000 6,417,000 6,105,000 
        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 9,433 and 8,475, respectively
                                                                  196,694,000                                    
        common stock - 0.10 par value, 70,000,000 shares authorized, 57,443,324 shares outstanding at march 31, 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  -252,443,000 -247,587,000 -242,279,000  -222,574,000 -214,999,000 -207,253,000  -188,531,000 -185,291,000 -179,659,000  -169,934,000 -163,490,000 
        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    -232,375,000    -197,257,000       
        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
                                                                                        12,928,000 12,803,000 11,653,000 10,551,000 10,204,000 9,566,000 9,102,000 8,833,000 8,805,000 8,705,000 8,144,000 7,988,000 8,119,000 7,853,000 
        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               
        customer receivables, less allowances of 9,033 and 8,109, respectively
                                                                                        124,137,000              
        common stock - 0.10 par value, 70,000,000 shares authorized, 24,856,485 and 24,845,235 shares outstanding at september 30, 2005 and december 31, 2004, respectively
                                                                                        2,486,000              
        customer receivables, less allowances of 9,091 and 8,109, respectively
                                                                                         119,539,000             
        common stock—0.10 par value, 70,000,000 shares authorized, 24,845,235 shares outstanding at june 30, 2005 and december 31, 2004
                                                                                         2,485,000             
        customer receivables, less allowances of 7,873 and 8,109, respectively
                                                                                          110,466,000            
        common stock - 0.10 par value, 70,000,000 shares authorized, 24,845,235 shares outstanding at march 31, 2005 and december 31, 2004
                                                                                          2,485,000            
        customer receivables, less allowances of 8,109 and 7,388, respectively
                                                                                           94,495,000           
        common stock - 0.10 par value, 70,000,000 shares authorized, 24,845,235 shares outstanding at december 31, 2004 and 25,000,00 authorized, 24,089,028 shares outstanding at december 31, 2003
                                                                                           2,485,000           
        customer receivables, less allowances of 7,588 and 7,388, respectively
                                                                                            93,906,000          
        common stock - .10 par value, 70,000,000 shares authorized, 24,836,235 shares outstanding at september 30, 2004 and 24,089,028 shares outstanding at december 31, 2003
                                                                                            2,484,000          
        customer receivables, less allowances of 7,309 and 7,388, respectively
                                                                                             87,941,000         
        common stock - .10 par value, 25,000,000 shares authorized, 24,100,235 shares outstanding at june 30, 2004 and 24,089,028 shares outstanding at december 31, 2003
                                                                                             2,410,000         
        customer receivables, less allowances of 7,473 and 7,388, respectively
                                                                                              80,763,000        
        common stock - .10 par value, 25,000,000 shares authorized, 16,059,352 shares outstanding at march 31, 2004 and december 31, 2003
                                                                                              1,606,000        
        customer receivables, less allowances of 7,388 and 7,866, respectively
                                                                                               73,036,000       
        common stock - .10 par value, 25,000,000 shares authorized, 16,059,352 shares outstanding at december 31, 2003 and 10,651,864 shares outstanding at december 31, 2002
                                                                                               1,606,000       
        customer receivables, less allowances of 7,690 and 7,866, respectively
                                                                                                75,589,000      
        other equipment
                                                                                                68,446,000 67,269,000 63,134,000 57,849,000 53,865,000 48,855,000 
        common stock – .10 par value, 25,000,000 shares authorized, 16,059,352 and 10,651,864 shares outstanding, respectively
                                                                                                1,606,000      
        customer receivables, less allowances of 8,164 and 7,866, respectively
                                                                                                 69,276,000     
        common stock—.10 par value, 25,000,000 shares authorized, 16,045,102 and 10,651,864 shares outstanding, respectively
                                                                                                 1,605,000     
        customer receivables, less allowances of 7,959 and 7,866, respectively
                                                                                                  71,141,000    
        common stock - .10 par value, 25,000,000 shares authorized, 10,692,264 and 8,315,240 shares outstanding, respectively
                                                                                                  1,069,000    
        customer receivables, less allowances of 7,866 and 6,816, respectively
                                                                                                   63,843,000   
        common stock - .10 par value, 25,000,000 shares authorized, 10,651,864 shares outstanding at december 31, 2002 and 8,312,840 shares outstanding at december 31, 2001
                                                                                                   1,065,000   
        customer receivables, less allowances of 7,511 and 6,816 respectively
                                                                                                    67,432,000  
        liabilities and stockholders’ equity
                                                                                                      
        stockholders’ equity:
                                                                                                      
        common stock—.10 par value, 25,000,000 shares authorized, 8,317,940 outstanding
                                                                                                    832,000  
        total stockholders’ equity
                                                                                                    149,689,000 143,282,000 
        total liabilities and stockholders’ equity
                                                                                                    351,998,000 334,966,000 
        customer receivables, less allowances of 6,671 and 6,816, respectively
                                                                                                     63,676,000 
        common stock—.10 par value, 25,000,000 shares authorized, 8,316,740 outstanding
                                                                                                     832,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2025-12-31 2025-09-30 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 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 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-12-31 2002-09-30 
                                                                                                       
          cash flows from operating activities:
                                                                                                       
          net income
        238,258,000 229,470,000 270,947,000 268,626,000 254,660,000 263,144,000 308,580,000 322,045,000 292,304,000 322,815,000 339,287,000 292,362,000 285,038,000 323,929,000 377,401,000 376,078,000 299,751,000 278,806,000 286,634,000 269,576,000 199,359,000 189,832,000 201,868,000 147,805,000 133,177,000 144,024,000 164,099,000 174,072,000 133,323,000 159,459,000 173,442,000 163,434,000 109,333,000 197,250,000 102,314,000 98,418,000 65,792,000 68,511,000 85,581,000 81,388,000 60,285,000 72,224,000 84,368,000 85,574,000 62,524,000 69,869,000 77,909,000 73,849,000 45,887,000 47,156,000 60,149,000 58,255,000 40,553,000 39,481,000 51,044,000 47,832,000 31,095,000 39,883,000 38,631,000 39,383,000 21,573,000 22,056,000 24,381,000 21,513,000 7,701,000 9,681,000 10,495,000 10,722,000 3,973,000 11,048,000 23,359,000 23,881,000 10,389,000 15,712,000 20,010,000 22,539,000 13,571,000     14,281,000 15,935,000 13,916,000 9,343,000 10,604,000 12,215,000 10,461,000 5,712,000 7,728,000 9,116,000 6,509,000 4,247,000 5,463,000 6,396,000 
          adjustments to reconcile net income to net cash from operating activities:
                                                                                                       
          depreciation and amortization
        92,308,000 92,671,000 92,220,000 90,665,000 89,135,000 88,810,000 86,668,000 84,566,000 84,534,000 84,652,000 84,059,000 79,787,000 75,951,000 72,057,000 68,351,000 68,314,000 67,344,000 66,793,000 65,164,000 63,951,000 63,991,000 65,110,000 64,987,000 65,735,000 65,435,000 64,544,000 63,493,000 62,571,000 63,073,000 62,555,000 58,086,000 56,235,000 53,481,000 53,093,000 51,934,000 50,449,000 50,287,000 49,574,000 49,041,000 46,480,000 44,772,000 44,223,000 42,561,000 39,771,000 38,788,000 39,546,000 37,707,000 35,121,000 34,092,000 33,807,000 32,914,000 30,517,000 29,834,000 29,948,000 28,727,000 26,524,000 25,544,000 24,290,000 23,396,000 22,013,000 21,121,000 19,862,000 19,396,000 19,553,000 21,551,000 23,801,000 24,036,000 23,948,000 22,999,000 22,386,000 22,045,000 21,513,000 21,169,000 20,813,000 20,556,000 20,062,000 18,432,000 67,628,800 100 -200 5,300 15,183,000 14,716,000 13,663,000 12,335,000 11,785,000 11,536,000 10,906,000 10,596,000 10,129,000 9,949,000 9,447,000 8,685,000 8,151,000 7,735,000 
          loss on disposal of property and equipment
        -2,835,000 -3,081,000 2,684,000 1,596,000 1,739,000   574,000 726,000       -856,000 -1,205,000 -384,000 -880,000 98,000 603,000 481,000 115,000 62,000 78,000 442,000                                                                      
          other
        8,667,000  7,540,000 7,649,000 7,384,000  6,525,000 7,273,000 7,732,000  7,530,000 6,481,000 8,390,000  9,123,000 7,534,000 8,115,000  7,563,000                                                    9,000 9,000 4,000                       
          changes in operating assets and liabilities
        37,236,000  91,533,000 -82,689,000 -16,399,000  35,637,000 -26,603,000 38,597,000  -38,030,000 -88,704,000 50,333,000  39,124,000 -23,742,000 14,720,000  -3,350,000 -144,870,000 40,231,000                                                                           
          net cash from operating activities
        373,634,000 310,293,000 437,474,000 285,847,000 336,519,000 401,059,000 446,476,000 387,855,000 423,893,000 436,693,000 429,235,000 287,840,000 415,367,000 361,348,000 514,181,000 427,328,000 388,725,000 339,991,000 364,324,000 197,983,000 310,308,000 246,566,000 170,242,000 312,198,000 204,018,000 236,373,000 285,632,000 255,708,000 206,175,000 224,698,000 250,727,000 213,444,000 211,247,000 148,281,000 149,499,000 127,705,000 110,809,000 155,455,000 117,897,000 123,838,000 168,393,000 181,606,000 118,049,000 81,631,000 172,594,000 113,659,000 96,342,000 82,105,000 99,568,000 97,280,000 99,522,000 90,330,000 63,534,000 105,318,000 78,316,000 66,095,000 78,327,000 77,031,000 81,169,000 45,373,000 73,807,000 30,911,000 40,985,000 34,138,000 35,042,000 38,505,000 37,269,000 22,311,000 32,631,000 65,057,000 50,024,000 42,795,000 38,630,000 38,120,000 36,212,000 26,815,000 56,589,000 35,941,000 42,477,000 28,385,000 47,807,000 34,187,000 31,041,000 15,657,000 32,737,000 12,810,000 18,347,000 28,782,000 29,906,000 13,119,000 26,886,000 17,825,000 17,234,000 454,000 10,831,000 
          capital expenditures
        -62,574,000 -45,776,000 -93,945,000 -187,164,000 -88,149,000 -170,919,000 -242,761,000 -238,127,000 -119,511,000 -105,946,000 -171,967,000 -244,660,000 -234,736,000 -270,366,000 -181,719,000 -229,350,000 -93,713,000 -165,389,000 -178,579,000 -155,156,000 -50,953,000 -58,622,000 -46,331,000 -67,917,000 -52,211,000 -109,015,000 -140,354,000 -159,215,000 -70,741,000 -118,426,000 -177,597,000 -191,711,000 -100,558,000 -93,285,000 -100,522,000 -131,321,000 -56,997,000 -66,820,000 -55,588,000 -175,239,000 -120,294,000 -100,044,000 -130,762,000 -159,100,000 -72,153,000 -55,687,000 -93,425,000 -138,750,000 -79,818,000 -66,407,000 -72,845,000 -129,405,000  -63,532,000 -99,642,000 -119,743,000 -89,182,000 -32,248,000 -67,455,000 -83,995,000 -58,450,000 -36,738,000 -23,523,000 -18,172,000 -27,453,000 -30,243,000 -50,232,000 -52,837,000 -77,576,000 -74,880,000 -44,533,000 -44,397,000 -17,689,000 -19,462,000 -30,427,000 -54,750,000 -82,189,000 -28,014,000 -42,506,000 -63,483,000 -65,095,000 -23,140,000 -34,431,000 -47,333,000 -37,692,000 -13,820,000 -10,310,000 -46,277,000 -23,292,000 -18,784,000 -19,696,000 -34,060,000 -29,363,000 -20,575,000 
          free cash flows
        311,060,000 264,517,000 343,529,000 98,683,000 248,370,000 230,140,000 203,715,000 149,728,000 304,382,000 330,747,000 257,268,000 43,180,000 180,631,000 90,982,000 332,462,000 197,978,000 295,012,000 174,602,000 185,745,000 42,827,000 259,355,000 187,944,000 123,911,000 244,281,000 151,807,000 127,358,000 145,278,000 96,493,000 135,434,000 106,272,000 73,130,000 21,733,000 110,689,000 54,996,000 48,977,000 -3,616,000 53,812,000 88,635,000 62,309,000 -51,401,000 48,099,000 81,562,000 -12,713,000 -77,469,000 100,441,000 57,972,000 2,917,000 -56,645,000 19,750,000 30,873,000 26,677,000 -39,075,000  41,786,000 -21,326,000 -53,648,000 -10,855,000 44,783,000 13,714,000 -38,622,000 15,357,000 -5,827,000 17,462,000 15,966,000 7,589,000 8,262,000 -12,963,000 -30,526,000 -44,945,000 -9,823,000 5,491,000 -1,602,000 20,941,000 18,658,000 5,785,000 -27,935,000 -25,600,000 7,927,000 -29,000 -35,098,000 -17,288,000 11,047,000 -3,390,000 -31,676,000 -4,955,000 -1,010,000 8,037,000 -17,495,000 6,614,000 -5,665,000 7,190,000 -16,235,000 -12,129,000 454,000 -9,744,000 
          cash flows from investing activities:
                                                                                                       
          purchase of property and equipment
        -62,574,000 -45,776,000 -93,945,000 -187,164,000 -88,149,000 -170,919,000 -242,761,000 -238,127,000 -119,511,000 -105,946,000 -171,967,000 -244,660,000 -234,736,000 -270,366,000 -181,719,000 -229,350,000 -93,713,000 -165,389,000 -178,579,000 -155,156,000 -50,953,000 -58,622,000 -46,331,000 -67,917,000 -52,211,000 -109,015,000 -140,354,000 -159,215,000 -70,741,000 -118,426,000 -177,597,000 -191,711,000 -100,558,000 -93,285,000 -100,522,000 -131,321,000 -56,997,000 -66,820,000 -55,588,000 -175,239,000 -120,294,000 -100,044,000 -130,762,000 -159,100,000 -72,153,000 -55,687,000 -93,425,000 -138,750,000 -79,818,000 -66,407,000 -72,845,000 -129,405,000 -26,949,000 -63,532,000 -99,642,000 -120,626,000 -89,393,000 -40,314,000 -67,455,000 -83,995,000 -58,450,000 -37,199,000 -23,523,000 -18,172,000 -27,453,000 -30,243,000 -50,232,000 -52,837,000 -77,576,000 -74,880,000 -44,533,000 -44,397,000 -17,689,000 -19,462,000 -30,427,000 -54,750,000 -82,189,000 -28,014,000 -42,506,000 -63,483,000 -65,095,000 -23,140,000 -34,431,000 -47,333,000 -37,692,000 -13,820,000 -10,310,000 -46,277,000 -23,292,000 -18,784,000 -19,696,000 -34,060,000 -29,363,000  -20,575,000 
          proceeds from sale of property and equipment
        9,923,000 37,608,000 3,853,000 1,830,000 5,232,000 3,974,000 11,321,000 3,270,000 1,559,000 26,411,000 4,616,000 7,327,000 10,283,000 2,052,000 1,116,000 8,473,000 10,455,000 913,000 3,123,000 7,856,000 7,656,000 279,000 841,000 1,027,000 1,543,000 3,088,000 2,232,000 89,000 277,000 3,654,000 2,801,000 181,000 347,000 2,603,000 2,248,000 5,561,000 1,828,000 5,970,000 1,574,000 2,306,000 691,000 5,070,000 9,021,000 8,500,000 1,851,000 2,381,000 1,260,000 16,190,000 2,035,000 1,881,000 741,000 7,798,000 815,000 6,573,000 2,347,000 2,470,000 628,000 226,000 1,156,000 2,817,000 1,237,000 1,263,000 171,000 262,000 354,000 1,121,000 187,000 786,000 209,000 528,000 1,578,000 795,000 582,000 1,911,000 1,497,000 811,000 1,009,000 569,000 3,108,000 1,248,000 701,000 1,783,000 942,000 2,290,000 206,000 130,000 430,000 999,000 34,000 89,000 1,270,000 1,223,000 880,000 322,000 186,000 
          net cash from investing activities
        -52,651,000 -8,168,000 -90,092,000 -185,234,000 -82,917,000 -166,945,000 -201,440,000 -264,857,000 -117,952,000 -79,535,000 -167,351,000 -213,059,000 -199,875,000 -158,637,000 -114,587,000 -165,794,000 -108,454,000 -194,106,000 -235,692,000 -2,418,000 -23,072,000 -183,214,000 -250,891,000 -66,890,000 -50,668,000 -105,927,000 -138,122,000 -159,126,000 -70,464,000 -114,653,000 -173,997,000 -191,530,000 -100,211,000 -90,682,000 -96,135,000 -125,760,000 -55,169,000 -60,850,000 -54,014,000 -172,933,000 -119,603,000 -94,974,000 -121,741,000 -150,600,000 -70,302,000 -53,306,000 -92,165,000 -122,560,000 -77,783,000 -64,526,000 -72,104,000 -121,607,000 -26,134,000 -56,959,000 -97,295,000 -118,156,000 -88,765,000 -40,088,000 -66,299,000 -81,178,000 -57,213,000 -35,936,000 -16,902,000 -17,910,000 -33,549,000 -29,122,000 -50,045,000 -52,051,000 -72,506,000 -70,252,000 -49,851,000 -42,245,000 -3,451,000 -28,194,000 -35,585,000 -27,177,000 -50,290,000 -36,680,000 -37,438,000 -152,162,000 -71,766,000 -29,115,000 -32,809,000 -45,003,000 -53,561,000 -13,690,000 -9,880,000 -45,278,000 -23,258,000 -18,695,000 -18,426,000 -32,837,000 -28,483,000  -20,389,000 
          cash flows from financing activities:
                                                                                                       
          payments for share repurchases
        -88,137,000 -124,913,000 -180,841,000 -223,507,000 -201,077,000 -182,522,000 -187,659,000 -511,833,000 -85,280,000 -85,518,000 -65,900,000 -160,529,000 -141,666,000 -199,918,000 -345,431,000 -393,518,000 -338,352,000 -256,250,000 -40,000,000 -240,215,000 -57,266,000 -128,497,000 -178,294,000 -35,614,000 -40,614,000 -134,136,000 -30,596,000 -86,676,000 -29,195,000 -30,095,000 -17,299,000 -878,000 -7,085,000 -50,000 -11,294,000 -34,339,000 -40,037,000 -44,646,000 -35,000,000 -36,718,000 -29,072,000 -13,327,000                                                   
          dividends paid
        -60,498,000 -58,432,000 -58,682,000 -59,032,000 -59,495,000 -55,412,000 -55,622,000 -55,951,000 -56,633,000 -43,597,000 -43,665,000 -43,775,000 -44,052,000 -33,044,000 -33,405,000 -33,839,000 -34,196,000 -22,979,000 -22,979,000 -23,176,000 -23,232,000 -17,552,000 -17,579,000 -17,582,000 -18,310,000 -13,547,000 -13,570,000 -13,645,000 -13,790,000 -10,555,000 -10,638,000 -10,678,000 -10,695,000 -8,228,000 -8,228,000 -8,234,000 -8,235,000                                                           
          other financing activities
        -4,357,000 -281,000 -324,000 -1,215,000 -4,508,000 -1,667,000 -1,896,000 -1,884,000 -16,853,000 -845,000 -859,000 -2,960,000 -8,462,000 -164,000 -165,000 -165,000 -8,165,000 -103,000 -96,000 -85,000 -4,569,000 -3,345,000 -468,000 -980,000 -507,000 -567,000                                           -2,000              
          net cash from financing activities
        -152,992,000 -228,626,000 -324,847,000 -173,754,000 -265,080,000 -199,601,000 -245,177,000 -629,668,000 -158,766,000 -129,960,000 -110,424,000 -227,264,000 -194,180,000 -233,126,000 -379,001,000 -327,522,000 -480,713,000 -23,082,000 -273,075,000 -63,261,000 -336,766,000 -82,318,000 -17,579,000 -83,656,000 -199,949,000 -49,161,000 -54,184,000 -148,249,000 -45,366,000 -97,231,000 -39,833,000 -41,280,000 -78,561,000 -8,228,000 -9,106,000 -15,663,000 -18,260,000 -99,448,000 -59,542,000 52,635,000 -53,129,000 -86,572,000 2,315,000 -31,280,000 -24,041,000 -33,735,000 -15,797,000 19,000,000 -10,715,000 -14,684,000 -22,684,000 9,464,000 -21,074,000 -42,404,000 14,866,000 8,857,000 -11,193,000 -3,355,000 -1,272,000 -23,674,000 66,099,000 5,418,000 -23,809,000 -20,914,000 3,805,000 -8,853,000 12,472,000 30,070,000 19,386,000 -1,644,000 -4,461,000 -159,000 -6,667,000 -4,575,000 -939,000 -339,000 -6,873,000 -301,000 -6,348,000 127,621,000 24,042,000 -10,489,000 7,134,000 27,844,000 22,621,000 -1,472,000 -6,553,000 16,622,000 -6,645,000 -1,965,000 -817,000 9,412,000 -1,461,000 33,810,000 9,312,000 
          increase in cash and cash equivalents
        167,991,000    -11,478,000 34,513,000   147,175,000 227,198,000   21,312,000     122,803,000 -144,443,000   -18,966,000 -98,228,000 161,652,000 -46,599,000 81,285,000 93,326,000 -51,667,000 90,345,000 12,814,000 36,897,000 -19,366,000 32,475,000 49,371,000 44,258,000 -13,718,000 37,380,000 -4,843,000   -4,339,000    78,251,000    11,070,000    16,326,000 5,955,000 -4,113,000 -43,204,000 -21,631,000 33,588,000 13,598,000 -59,479,000 82,693,000 393,000 274,000 -4,686,000 5,298,000 530,000 -304,000 330,000 -20,489,000 -6,839,000 -4,288,000 391,000 28,512,000 5,351,000 -312,000 -701,000 -574,000 -1,040,000 -1,309,000 3,844,000 83,000 -5,417,000 5,366,000 -1,502,000 1,797,000 -2,352,000 1,914,000 126,000 3,000 -7,541,000 7,643,000 -5,600,000 -12,710,000 18,430,000 -246,000 
          cash and cash equivalents at beginning of period
        120,091,000  108,676,000  433,799,000  186,312,000  462,564,000  401,430,000  403,571,000  190,282,000  127,462,000  10,171,000  11,472,000  34,787,000  30,174,000  12,857,000  75,850,000  5,450,000  4,171,000  24,104,000  6,328,000  2,564,000  986,000  742,000 1,051,000 19,259,000 
          cash and cash equivalents at end of period
        288,082,000  22,535,000 -73,141,000 97,198,000  -141,000 -506,670,000 580,974,000  151,460,000 -152,483,000 207,624,000  20,593,000 -65,988,000 262,122,000  -144,443,000 132,304,000 351,900,000  -98,228,000 161,652,000 356,972,000  93,326,000 -51,667,000 280,627,000  36,897,000 -19,366,000 159,937,000  44,258,000 -13,718,000 47,551,000  4,341,000 3,540,000 7,133,000  -1,377,000 -100,249,000 113,038,000  -11,620,000 -21,455,000 41,244,000  4,734,000 -21,813,000 29,183,000  -4,113,000 -43,204,000 54,219,000  13,598,000 -59,479,000 88,143,000  274,000 -4,686,000 9,469,000  -304,000 330,000 3,615,000  -4,288,000 391,000 34,840,000  -312,000 -701,000 1,990,000  -1,309,000 3,844,000 1,069,000  5,366,000 -1,502,000 2,539,000 -2,352,000 1,914,000 126,000 1,054,000 -7,541,000 7,643,000 -5,600,000 6,549,000 18,430,000 -246,000 
          noncash lease expense
                                                                                                       
          deferred income taxes
         16,203,000    7,114,000    15,937,000    41,303,000                            52,930,000 5,163,000 4,338,000 -18,789,000 32,694,000 7,325,000 -12,773,000 -1,702,000 2,435,000 28,234,000 5,803,000 -3,736,000 5,807,000 14,213,000 11,405,000 -13,743,000 9,669,000 18,554,000 19,771,000 -4,646,000 7,166,000 4,536,000 945,000 -5,023,000 -1,189,000 3,968,000 6,752,000 1,247,000 1,523,000 -1,737,000 3,666,000 1,900,000 2,039,000 3,800,000 1,328,000 1,386,000                   
          share-based compensation
                             2,960,000 4,095,000 2,209,000 2,073,000 11,354,000 1,147,000 2,283,000 1,933,000 1,335,000 1,284,000 1,143,000 1,132,000 826,000 826,000 880,000 710,000                                                           
          changes in assets and liabilities:
                                                                                                       
          customer and other receivables
                                                                                         8,453,000 -5,255,000 -10,517,000 -13,450,000 -886,000 -6,663,000 -6,635,000 -7,276,000 3,103,000 -6,764,000 869,000 -4,781,000  -3,803,000 
          prepaid expenses and other assets
                                                                                         -5,807,000 -810,000 -631,000 1,910,000 -6,573,000 1,068,000 -621,000 1,749,000 -909,000 1,900,000 651,000 4,290,000  -622,000 
          accounts payable
                                                                                         -4,717,000 5,730,000 -2,343,000 6,992,000 1,253,000 -4,438,000 8,540,000 10,586,000 -7,052,000 3,370,000 -1,897,000 923,000 -2,390,000 -3,742,000 
          compensation, benefits and other accrued liabilities
                                                                                         -1,988,000 -4,384,000 4,135,000 10,653,000 -6,970,000 995,000 2,870,000 3,749,000 -1,680,000 2,897,000 1,889,000 3,116,000 -2,590,000 3,206,000 
          claims and insurance accruals
                                                                                         6,318,000 2,197,000 2,521,000 1,727,000 1,267,000 1,561,000 2,364,000 2,806,000 -66,000 884,000 778,000 784,000 -838,000 1,051,000 
          income taxes
                                                                                                       
          other liabilities
                                                                                         266,000 310,000 236,000 75,000 677,000 241,000 147,000 455,000 57,000 295,000 321,000 137,000 -49,000 31,000 
          purchase of short-term investments
                   -63,723,000 -24,835,000 -75,162,000 -104,557,000 -164,867,000 -89,965,000 -154,859,000                                                                          
          proceeds from maturities of short-term investments
                24,274,000 24,578,000 109,677,000 129,739,000 79,918,000 49,966,000 74,927,000 105,131,000 144,882,000 110,190,000                                                                           
          other investing
                                                                                                     
          principal payments under long-term debt agreements
                                   -50,000,000     -25,596,000 -892,000 -889,000 -967,000 -25,208,000 -10,714,000 -25,000,000 -10,715,000 -2,688,000 -25,216,000 -11,074,000 -3,024,000 -482,000 -25,579,000 -11,199,000 -3,355,000 -768,000 -25,188,000 -11,071,000 -133,000 -201,000 -25,199,000 -11,148,000 -195,000 -192,000 -388,000 -11,197,000 -478,000 -5,627,000 -159,000 -6,667,000 -253,000 -5,261,000 -339,000 -6,873,000 -301,000 -5,736,000 -4,205,000 -7,659,000 -1,398,000 -6,513,000 -4,442,000 -10,046,000 -1,382,000 -6,307,000 -4,150,000 -10,281,000 -1,910,000 -1,382,000 -4,283,000 -4,872,000  -937,000 
          cash and cash equivalents at beginning of year
                                                                                                       
          cash and cash equivalents at end of year
                                                                                                       
          interest paid
                                                                                                       
          capitalized interest
                                                                                                       
          net borrowings under credit agreement
                                                                                                       
          forward contract for accelerated share repurchases
                       -100,000,000 6,250,000 -68,750,000                                                                          
          decrease in cash and cash equivalents
          22,535,000              -200,442,000    -49,530,000                      -1,377,000    -11,620,000    4,734,000                                             
          net borrowings under our credit agreement
                                                                                                       
          gain on disposal of property and equipment
             -1,541,000    -15,109,000 -1,015,000 -2,086,000 -4,345,000                                                                                   
          principal payments under debt agreements
                                                                                                   
          income taxes paid
                                                                                                       
          other investing activities
                                                                       -6,450,000                               
          supplemental disclosure of noncash investing and financing activities:
                                                                                                       
          noncash purchases of property
                                                                                                       
          proceeds from issuance of long-term debt
                                                           406,000 6,000 -504,000 1,514,000 95,000,000                   -62,000 834,000 25,000,000 50,000,000   2,650,000 365,000  
          provision for deferred income taxes
                              -11,755,000                                                                         
          other operating activities
                            6,124,000  -89,068,000 109,787,000 3,255,000  51,987,000 16,541,000 7,369,000  -18,799,000 -7,789,000 46,937,000  -5,795,000 -22,450,000 -6,057,000  -16,801,000 -4,296,000 63,136,000  -13,566,000 -46,385,000 90,104,000  -26,695,000 -10,848,000 20,443,000  -21,913,000 -1,866,000 -3,164,000  -15,613,000 -20,036,000 34,957,000                                       
          net payments on revolving line of credit
                                            -9,975,000    -7,591,000            -10,000,000                                          
          loss on sale of property and equipment
                                   241,000 477,000 549,000 -857,000 421,000 364,000 569,000 220,000 408,000 77,000 -374,000 76,000 266,000 200,000    -33,000    848,000 -3,549,000 138,000 -2,379,000 47,000 -711,000 -55,000 370,000 474,000 363,000 117,000 266,000 517,000 500,000 131,000   163,000       -1,359,000   -106,000 66,000     213,000 703,000 50,000 142,000 169,000   44,000 88,000 401,000 -181,000 -11,000 149,000 67,000 
          net proceeds on revolving line of credit
                                           -88,154,000 -25,203,000   -50,683,000 40,000,000    -15,797,000                                  31,701,000               
          gain on sale of property and equipment
                                                 -1,415,000 -477,000    96,000                  -171,000   433,000 -703,000 188,000 -296,000                         
          proceeds from stock issuance, net of issuance costs
                                                                 48,400,000                                   
          net proceeds from revolving line of credit
                                                          -22,684,000    15,350,000     -66,230,000      12,664,000                13,214,000 7,286,000 -17,333,000  -20,000,000 19,864,000 3,636,000  382,000     
          acquisition of property and equipment by capital lease
                                                             883,000 211,000 8,066,000    461,000                                  
          changes in assets and liabilities, net of acquisition effects:
                                                                                                       
          proceeds from sale of short-term investment securities
                                                                         4,861,000 9,900,000 2,005,000 16,495,000 33,475,000 22,535,000 16,065,000 71,720,000 111,140,000 78,276,000 134,510,000                 
          fair value of property exchanged
                                                                     -647,000 1,191,000 1,277,000 5,400,000 2,423,000                       
          supplemental disclosure of noncash investing activities:
                                                                                                       
          changes in assets and liabilities
                                                                   -36,060,000 35,242,000  -7,459,000 -8,171,000 10,984,000  -1,510,000 -19,544,000 5,115,000  6,644,000 -5,600,000 6,527,000  -8,094,000 -17,008,000 23,134,000                   
          purchase of short-term investment securities
                                                                             -5,800,000 -8,901,000 -15,000,000 -12,690,000 -31,350,000 -16,100,000 -32,975,000 -80,250,000 -83,895,000 -125,601,000                 
          acquisition of business assets
                                                                             -138,000 -7,129,000 -1,828,000 -6,620,000   -3,616,000 -6,949,000 -1,477,000 -7,372,000 -7,758,000 680,000 40,000 -16,075,000           
          net proceeds from short-term revolving line of credit
                                                                       4,285,000 14,953,000    30,583,000                           
          acquisition of property and equipment
                                                                                                       
          cumulative effect of accounting change, net of tax
                                                                                                       
          income taxes payable
                                                                                         1,580,000 -500,000 -4,516,000 6,140,000 1,445,000 -2,730,000 -1,627,000 2,621,000      778,000 
          tires on equipment
                                                                                          -125,000 -1,150,000 -1,102,000 -347,000 -638,000 -464,000 -269,000 -28,000 -100,000 -561,000 -156,000  -266,000 
          proceeds from stock issuance
                                                                                                       
          other financing
                                                                                                       
          senior notes
                                                                                      -5,000,000 172,143,000 105,857,000               
          revolving credit facility
                                                                                        43,174,000               
          equipment and other obligations
                                                                                      -470,000 -1,083,000 2,052,000               
          capitalized lease obligations
                                                                                      -266,000 -265,000 1,915,000               
          less current maturities
                                                                                      -475,000 -3,867,000 17,116,000               
          revenue from operations
                                                                                      100,000               
          operating expenses:
                                                                                                       
          salaries, wages and benefits
                                                                                      1,500 -3,300 54,900               
          operating supplies and expenses
                                                                                      700 400 15,600               
          general supplies and expenses
                                                                                      -200 -200 3,200               
          operating taxes and licenses
                                                                                      100 -300 3,800               
          insurance and claims
                                                                                      -500 -300 2,900               
          communications and utilities
                                                                                      -100 -200 1,300               
          purchased transportation
                                                                                      -400 400 3,400               
          building and office equipment rents
                                                                                      -100 -100 1,000               
          miscellaneous expenses
                                                                                      -300 200 500               
          total operating expenses
                                                                                      800 -3,600 91,900               
          operating income
                                                                                      -800 3,600 8,100               
          interest expense, net *
                                                                                                       
          other expense
                                                                                      100               
          income before income taxes and cumulative effect of accounting change
                                                                                      -1,000 3,400 7,500               
          provision for income taxes
                                                                                      -500 1,400 3,000               
          income before cumulative effect of accounting change
                                                                                      -500 2,000 4,500               
          interest expense
                                                                                       200 500               
          deferred income tax
                                                                                          2,524,000 293,000 -2,028,000  5,295,000 3,175,000 -867,000       
          proceeds from the issuance of stock
                                                                                                       
          proceeds from the conversion of stock options
                                                                                                 183,000 77,000 761,000   
          proceeds from conversion of stock options
                                                                                                       
          net proceeds from stock issuance