Consolidated Statements Of Income (Loss) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements Of Income (Loss) [Abstract]
Revenue	$ 207,748	$ 185,388
Operating expenses:
Salaries, wages and other employee benefits	83,215	69,617
Purchased transportation	31,477	29,992
Depreciation and amortization	4,075	4,357
Maintenance	9,671	8,092
Rents and leases	11,250	8,081
Purchased labor and owner operators	17,985	18,325
Fuel and fuel-related expenses	37,235	30,130
Other operating expenses	16,932	15,325
Other loss (income)	76	(38)
Total operating expenses	211,916	183,881
Income (loss) from operations before undernoted	(4,168)	1,507
Interest expense, net	1,311	1,342
Income (loss) from operations before income taxes	(5,479)	165
Income tax expense	337	389
Net loss	$ (5,816)	$ (224)
Loss per share:
Basic and Diluted	$ (0.36)	$ (0.01)
Weighted average number of shares:
Basic	16,367,109	16,315,374
Diluted	16,367,109	16,315,374