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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues      
Freight revenue $ 529,080 $ 512,026 $ 546,320
Fuel surcharge revenue 145,174 140,601 103,429
Total revenue 674,254 652,627 649,749
Operating expenses:      
Salaries, wages, and related expenses 217,080 211,169 216,316
Fuel expense 194,841 208,693 177,239
Operations and maintenance 45,265 43,585 42,050
Revenue equipment rentals and purchased transportation 85,010 63,353 71,474
Operating taxes and licenses 11,043 12,148 11,090
Insurance and claims 33,707 36,163 32,648
Communications and utilities 4,809 5,137 4,974
General supplies and expenses 16,068 15,627 16,143
Depreciation and amortization, including gains and losses on disposition of equipment 43,222 46,274 51,807
Goodwill impairment   11,539  
Total operating expenses 651,045 653,688 623,741
Operating income (loss) 23,209 (1,061) 26,008
Other expenses (income):      
Interest expense 12,697 16,208 16,566
Interest income   (32) (2)
Other (13) (123) (20)
Other expenses, net 12,684 16,053 16,544
Equity in income of affiliate 1,875 675  
Income (loss) before income taxes 12,400 (16,439) 9,464
Income tax expense (benefit) 6,335 (2,172) 6,175
Net income (loss) $ 6,065 $ (14,267) $ 3,289
Income (loss) per share:      
Basic income (loss) per share: (in Dollars per share) $ 0.41 $ (0.97) $ 0.23
Diluted income (loss) per share: (in Dollars per share) $ 0.41 $ (0.97) $ 0.23
Basic weighted average shares outstanding (in Shares) 14,742 14,689 14,374
Diluted weighted average shares outstanding (in Shares) 14,808 14,689 14,505