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Condensed Statements Of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Revenue from operations $ 755,435 $ 762,151 $ 1,463,168 $ 1,458,396
Operating expenses:        
Salaries, wages and benefits 408,424 387,423 809,293 755,865
Operating supplies and expenses 80,335 93,390 155,707 181,439
General supplies and expenses 22,778 23,533 43,920 44,825
Operating taxes and licenses 23,466 23,538 46,654 45,812
Insurance and claims 9,363 10,321 19,607 20,363
Communications and utilities 7,327 6,501 14,332 13,276
Depreciation and amortization 46,480 39,771 91,252 78,559
Purchased transportation 18,176 32,702 36,672 62,850
Building and office equipment rents 2,164 2,474 4,437 4,752
Miscellaneous expenses, net 3,486 1,599 8,310 6,191
Total operating expenses 621,999 621,252 1,230,184 1,213,932
Operating income 133,436 140,899 232,984 244,464
Non-operating expense (income):        
Interest expense 1,064 1,169 2,247 2,738
Interest income (12) (83) (28) (154)
Other expense (income), net 260 441 776 678
Total non-operating expense 1,312 1,527 2,995 3,262
Income before income taxes 132,124 139,372 229,989 241,202
Provision for income taxes 50,736 53,798 88,316 93,104
Net income $ 81,388 $ 85,574 $ 141,673 $ 148,098
Earnings per share:        
Basic $ 0.98 $ 1.00 $ 1.69 $ 1.73
Diluted $ 0.98 $ 1.00 $ 1.69 $ 1.73
Weighted average shares outstanding:        
Basic 83,354,013 85,726,933 83,668,521 85,848,208
Diluted 83,381,429 85,726,933 83,682,228 85,848,208