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Condensed Statements Of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
Revenue from operations $ 782,611 $ 779,474 $ 2,245,779 $ 2,237,870
Operating expenses:        
Salaries, wages and benefits 425,076 406,592 1,234,369 1,162,457
Operating supplies and expenses 83,197 88,669 238,904 270,108
General supplies and expenses 22,010 24,350 65,930 69,175
Operating taxes and licenses 22,714 23,855 69,368 69,667
Insurance and claims 10,185 10,808 29,792 31,171
Communications and utilities 7,025 6,867 21,357 20,143
Depreciation and amortization 49,041 42,561 140,293 121,120
Purchased transportation 18,907 30,297 55,579 93,147
Building and office equipment rents 2,050 2,395 6,487 7,147
Miscellaneous expenses, net 5,002 3,226 13,312 9,417
Total operating expenses 645,207 639,620 1,875,391 1,853,552
Operating income 137,404 139,854 370,388 384,318
Non-operating expense (income):        
Interest expense 1,131 1,163 3,378 3,901
Interest income (10) (33) (38) (187)
Other expense (income), net 6 1,866 782 2,544
Total non-operating expense 1,127 2,996 4,122 6,258
Income before income taxes 136,277 136,858 366,266 378,060
Provision for income taxes 50,696 52,490 139,012 145,594
Net income $ 85,581 $ 84,368 $ 227,254 $ 232,466
Earnings per share:        
Basic $ 1.03 $ 0.99 $ 2.73 $ 2.71
Diluted $ 1.03 $ 0.99 $ 2.73 $ 2.71
Weighted average shares outstanding:        
Basic 82,742,070 85,247,467 83,357,449 85,645,760
Diluted 82,811,371 85,247,467 83,389,824 85,645,760