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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Statement [Abstract]    
Operating Revenue $ 299,730 $ 273,795
Operating Expenses:    
Salaries, wages and employees' benefits 150,222 136,854
Purchased transportation 21,991 16,771
Fuel, operating expenses and supplies 79,959 79,002
Operating taxes and licenses 8,975 9,579
Claims and insurance 9,518 5,595
Depreciation and amortization 13,841 11,634
Operating gains, net (7) (172)
Total operating expenses 284,499 259,263
Operating Income 15,231 14,532
Nonoperating Expenses:    
Interest expense 1,316 1,528
Other, net (30) (66)
Nonoperating expenses, net 1,286 1,462
Income Before Income Taxes 13,945 13,070
Income Tax Provision 5,369 3,915
Net Income $ 8,576 $ 9,155
Weighted average common shares outstanding - basic 24,382 23,985
Weighted average common shares outstanding - diluted 25,361 24,948
Basic Earnings Per Share $ 0.35 $ 0.38
Diluted Earnings Per Share $ 0.34 $ 0.37