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Condensed Statements Of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Income Statement [Abstract]    
Revenue from operations $ 497,140 $ 422,679
Operating expenses:    
Salaries, wages and benefits 257,989 221,498
Operating supplies and expenses 94,216 82,633
General supplies and expenses 14,152 11,566
Operating taxes and licenses 16,356 15,529
Insurance and claims 7,683 7,192
Communications and utilities 4,854 4,550
Depreciation and amortization 25,544 21,121
Purchased transportation 16,231 14,290
Building and office equipment rents 3,268 3,387
Miscellaneous expenses, net 2,629 2,992
Total operating expenses 442,922 384,758
Operating income 54,218 37,921
Non-operating expense (income):    
Interest expense 3,219 3,876
Interest income (52) (19)
Other income, net (346) (1,418)
Total non-operating expense 2,821 2,439
Income before income taxes 51,397 35,482
Provision for income taxes 20,302 13,909
Net income $ 31,095 $ 21,573
Earnings per share:    
Basic $ 0.54 $ 0.38
Diluted $ 0.54 $ 0.38
Weighted average shares outstanding:    
Basic 57,443,324 56,255,970
Diluted 57,443,324 56,255,970