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Consolidated Condensed Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Revenue:        
Freight revenue $ 133,630 $ 141,392 $ 258,048 $ 270,728
Fuel surcharge revenue 39,235 27,587 71,208 50,262
Total revenue 172,865 168,979 329,256 320,990
Operating expenses:        
Salaries, wages, and related expenses 54,474 54,772 106,215 107,779
Fuel expense 56,301 44,047 106,973 86,205
Operations and maintenance 10,715 10,314 20,888 20,388
Revenue equipment rentals and purchased transportation 15,459 19,245 29,436 36,884
Operating taxes and licenses 3,014 3,081 6,116 5,410
Insurance and claims 11,193 8,098 19,883 15,712
Communications and utilities 1,248 1,407 2,583 2,241
General supplies and expenses 3,981 4,682 7,849 8,640
Depreciation and amortization, including gains and losses on disposition of equipment 9,246 13,291 21,778 25,873
Total operating expenses 165,631 158,937 321,721 309,132
Operating income 7,234 10,042 7,535 11,858
Other (income) expenses:        
Interest expense 3,926 4,290 8,022 8,243
Interest income (10) 0 (32) (2)
Other (income) expense, net (15) 5 (43) (41)
Other expenses, net 3,901 4,295 7,947 8,200
Equity in income of affiliate 125 0 125 0
Income (loss) before income taxes 3,458 5,747 (287) 3,658
Income tax expense 1,803 2,858 522 2,945
Net income (loss) $ 1,655 $ 2,889 $ (809) $ 713
Basic and diluted net income (loss) per share (in Dollars per share) $ 0.11 $ 0.20 $ (0.06) $ 0.05
Basic weighted average shares outstanding (in Shares) 14,702 14,257 14,657 14,224
Diluted weighted average shares outstanding (in Shares) 14,833 14,361 14,657 14,294