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Condensed Statements Of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Revenue from operations $ 779,474 $ 743,586 $ 2,237,870 $ 2,066,849
Operating expenses:        
Salaries, wages and benefits 406,592 363,420 1,162,457 1,014,910
Operating supplies and expenses 88,669 111,670 270,108 327,881
General supplies and expenses 24,350 21,931 69,175 61,955
Operating taxes and licenses 23,855 21,338 69,667 61,006
Insurance and claims 10,808 10,118 31,171 27,927
Communications and utilities 6,867 6,320 20,143 19,156
Depreciation and amortization 42,561 37,707 121,120 106,920
Purchased transportation 30,297 34,590 93,147 96,883
Building and office equipment rents 2,395 2,880 7,147 7,899
Miscellaneous expenses, net 3,226 7,350 9,417 13,303
Total operating expenses 639,620 617,324 1,853,552 1,737,840
Operating income 139,854 126,262 384,318 329,009
Non-operating expense (income):        
Interest expense 1,163 1,463 3,901 5,161
Interest income (33) (19) (187) (78)
Other expense (income), net 1,866 951 2,544 1,761
Total non-operating expense 2,996 2,395 6,258 6,844
Income before income taxes 136,858 123,867 378,060 322,165
Provision for income taxes 52,490 45,958 145,594 124,520
Net income $ 84,368 $ 77,909 $ 232,466 $ 197,645
Earnings per share:        
Basic $ 0.99 $ 0.90 $ 2.71 $ 2.29
Diluted $ 0.99 $ 0.90 $ 2.71 $ 2.29
Weighted average shares outstanding:        
Basic 85,247,467 86,164,917 85,645,760 86,164,917
Diluted 85,247,467 86,164,917 85,645,760 86,164,917