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Condensed Consolidated 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
OPERATING REVENUES:        
Revenue, before fuel surcharge $ 74,480 $ 71,940 $ 142,604 $ 142,299
Fuel surcharge 21,410 13,298 38,313 24,786
Total operating revenues 95,890 85,238 180,917 167,085
OPERATING EXPENSES AND COSTS:        
Salaries, wages and benefits 29,386 26,974 58,215 53,970
Fuel expense 34,137 24,692 65,401 48,992
Rent and purchased transportation 5,927 11,286 10,811 22,322
Depreciation 8,642 6,505 16,674 13,042
Operating supplies and expenses 9,329 7,127 18,484 14,090
Operating taxes and licenses 1,257 1,273 2,524 2,321
Insurance and claims 3,433 3,195 6,713 6,433
Communications and utilities 629 664 1,350 1,370
Other 1,549 1,230 2,932 2,284
Loss (gain) on disposition of equipment 2 (28) 27 (29)
Total operating expenses and costs 94,291 82,918 183,131 164,795
OPERATING INCOME (LOSS) 1,599 2,320 (2,214) 2,290
NON-OPERATING INCOME 26 379 1,152 388
INTEREST EXPENSE (491) (606) (981) (1,107)
INCOME (LOSS) BEFORE INCOME TAXES 1,134 2,093 (2,043) 1,571
FEDERAL AND STATE INCOME TAX EXPENSE (BENEFIT):        
Current 0 1,409 0 2,165
Deferred 441 (578) (757) (1,540)
Total federal and state income tax expense (benefit) 441 831 (757) 625
NET INCOME (LOSS) $ 693 $ 1,262 $ (1,286) $ 946
INCOME (LOSS) PER COMMON SHARE:        
Basic (in dollars per share) $ 0.08 $ 0.13 $ (0.14) $ 0.10
Diluted (in dollars per share) $ 0.08 $ 0.13 $ (0.14) $ 0.10
AVERAGE COMMON SHARES OUTSTANDING:        
Basic (in shares) 9,098 9,415 9,245 9,414
Diluted (in shares) 9,102 9,421 9,245 9,419