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Condensed Statements Of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement [Abstract]        
Revenue from operations $ 762,151 $ 702,987 $ 1,458,396 $ 1,323,263
Operating expenses:        
Salaries, wages and benefits 387,423 340,309 755,865 651,490
Operating supplies and expenses 93,390 109,917 181,439 216,211
General supplies and expenses 23,533 20,889 44,825 40,024
Operating taxes and licenses 23,538 20,618 45,812 39,668
Insurance and claims 10,321 9,836 20,363 17,809
Communications and utilities 6,501 6,102 13,276 12,836
Depreciation and amortization 39,771 35,121 78,559 69,213
Purchased transportation 32,702 33,157 62,850 62,293
Building and office equipment rents 2,474 2,513 4,752 5,019
Miscellaneous expenses, net 1,599 1,830 6,191 5,953
Total operating expenses 621,252 580,292 1,213,932 1,120,516
Operating income 140,899 122,695 244,464 202,747
Non-operating expense (income):        
Interest expense 1,169 1,622 2,738 3,698
Interest income (83) (26) (154) (59)
Other expense (income), net 441 35 678 810
Total non-operating expense 1,527 1,631 3,262 4,449
Income before income taxes 139,372 121,064 241,202 198,298
Provision for income taxes 53,798 47,215 93,104 78,562
Net income $ 85,574 $ 73,849 $ 148,098 $ 119,736
Earnings per share:        
Basic $ 1.00 $ 0.86 $ 1.73 $ 1.39
Diluted $ 1.00 $ 0.86 $ 1.73 $ 1.39
Weighted average shares outstanding:        
Basic 85,726,933 86,164,917 85,848,208 86,164,917
Diluted 85,726,933 86,164,917 85,848,208 86,164,917