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Consolidated Statements Of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Income [Abstract]      
Operating revenues $ 2,002,850 $ 1,815,020 $ 1,666,470
Operating expenses:      
Salaries, wages and benefits 536,509 527,576 522,962
Fuel 412,905 313,518 247,640
Supplies and maintenance 169,386 155,943 141,402
Taxes and licenses 92,917 94,018 96,406
Insurance and claims 67,523 69,991 83,458
Depreciation 158,634 152,242 155,315
Rent and purchased transportation 387,472 352,648 305,854
Communications and utilities 15,181 15,123 15,856
Other (11,351) (621) 886
Total operating expenses 1,829,176 1,680,438 1,569,779
Operating income 173,674 134,582 96,691
Other expense (income):      
Interest expense 85 47 99
Interest income (1,448) (1,536) (1,779)
Other 131 (166) (466)
Total other income (1,232) (1,655) (2,146)
Income before income taxes 174,906 136,237 98,837
Income taxes 72,149 56,198 42,253
Net income $ 102,757 $ 80,039 $ 56,584
Earnings per share:      
Basic $ 1.41 $ 1.11 $ 0.79
Diluted $ 1.40 $ 1.10 $ 0.79
Weighted-average common shares outstanding:      
Basic 72,787 72,369 71,672
Diluted 73,225 72,807 72,075