Consolidated Statements Of Income (Loss) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements Of Income (Loss) [Abstract]
Revenue	$ 206,159	$ 174,124	$ 600,428	$ 500,980
Operating expenses:
Salaries, wages and other employee benefits	79,958	67,031	229,452	197,719
Purchased transportation	32,814	29,986	97,431	83,828
Depreciation and amortization	3,976	4,620	12,373
Maintenance	9,656	7,622	26,742	21,509
Rents and leases	10,469	7,152	27,725	21,002
Purchased labor and owner operators	19,579	17,214	58,163	47,015
Fuel and fuel-related expenses	34,509	21,910	100,713	64,760
Other operating expenses	15,933	14,479	47,403	43,501
Other income	4	41	(101)	(105)
Total operating expenses	206,898	170,055	599,901	493,243
Income (loss) from continuing operations before undernoted	(739)	4,069	527	7,737
Interest expense, net	1,694	1,792	4,347	5,815
Income (loss) from continuing operations before income taxes	(2,433)	2,277	(3,820)	1,922
Income tax expense (recovery)	987	408	2,121	(237)
Net income (loss) from continuing operations	(3,420)	1,869	(5,941)	2,159
Discontinued operations, net of income taxes		93		602
Net income (loss)	$ (3,420)	$ 1,962	$ (5,941)	$ 2,761
Basic:
Net loss from continuing operations	$ (0.21)	$ 0.11	$ (0.36)	$ 0.13
Discontinued operations income		$ 0.01		$ 0.04
Net loss	$ (0.21)	$ 0.12	$ (0.36)	$ 0.17
Diluted:
Net loss from continuing operations	$ (0.21)	$ 0.11	$ (0.36)	$ 0.13
Discontinued operations income		$ 0.01		$ 0.04
Net loss	$ (0.21)	$ 0.12	$ (0.36)	$ 0.17
Weighted average number of shares:
Basic	16,330,171	16,277,202	16,325,250	16,270,067
Diluted	16,330,171	16,359,468	16,325,250	16,359,203