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Statements Of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement [Abstract]      
Revenue from operations $ 2,337,648 $ 2,134,579 $ 1,903,800
Operating expenses      
Salaries, wages and benefits 1,170,773 1,066,551 956,079
Operating supplies and expenses 385,201 378,534 355,186
General supplies and expenses 69,765 58,908 49,900
Operating taxes and licenses 71,599 67,526 63,284
Insurance and claims 30,910 29,681 27,693
Communications and utilities 23,142 19,980 18,104
Depreciation and amortization 127,072 110,743 90,820
Purchased transportation 106,435 94,522 84,516
Building and office equipment rents 11,920 13,514 13,689
Miscellaneous expenses, net 2,393 9,366 10,457
Total operating expenses 1,999,210 1,849,325 1,669,728
Operating income 338,438 285,254 234,072
Non-operating expense (income)      
Interest expense 9,620 11,541 14,067
Interest income (147) (113) (180)
Other expense, net 279 728 101
Total non-operating expense 9,752 12,156 13,988
Income before income taxes 328,686 273,098 220,084
Provision for income taxes 122,573 103,646 80,614
Net income $ 206,113 $ 169,452 $ 139,470
Earnings per share      
Basic $ 2.39 $ 1.97 $ 1.63
Diluted $ 2.39 $ 1.97 $ 1.63
Weighted average shares outstanding      
Basic 86,164,917 86,164,964 85,719,728
Diluted 86,164,917 86,164,964 85,719,728