Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue:
Trucking revenue	$ 83,207	$ 81,434	$ 163,414	$ 161,227
Strategic Capacity Solutions revenue	41,762	30,028	79,166	55,123
Base revenue	124,969	111,462	242,580	216,350
Fuel surcharge revenue	28,329	28,276	56,207	55,416
Total revenue	153,298	139,738	298,787	271,766
Operating expenses and costs:
Purchased transportation	44,538	35,730	85,788	66,208
Salaries, wages and employee benefits	38,703	34,663	74,542	70,230
Fuel and fuel taxes	30,704	33,017	63,707	68,613
Operations and maintenance	11,629	13,649	24,691	25,157
Depreciation and amortization	11,148	10,852	22,603	21,767
Insurance and claims	5,903	7,024	11,887	12,413
Operating taxes and licenses	1,355	1,696	2,801	2,704
Communications and utilities	1,094	984	2,133	2,069
Gain on disposal of assets, net	(179)	(429)	(522)	(819)
Other	4,146	3,497	7,943	7,195
Total operating expenses and costs	149,041	140,683	295,573	275,537
Operating income (loss)	4,257	(945)	3,214	(3,771)
Other expenses (income):
Interest expense	744	947	1,455	1,784
Defense costs	2,163		2,528
Other, net	(16)	(46)	48	(99)
Total other expenses, net	2,891	901	4,031	1,685
Income (loss) before income taxes	1,366	(1,846)	(817)	(5,456)
Income tax expense (benefit)	644	(448)	50	(1,584)
Net income (loss) and Comprehensive income (loss)	$ 722	$ (1,398)	$ (867)	$ (3,872)
Net income (loss) per share information:
Average shares outstanding (Basic) (in Shares)	10,346	10,293	10,343	10,299
Basic earnings (loss) per share (in Dollars per share)	$ 0.07	$ (0.14)	$ (0.08)	$ (0.38)
Average shares outstanding (Diluted) (in Shares)	10,478	10,293	10,343	10,299
Diluted earnings (loss) per share (in Dollars per share)	$ 0.07	$ (0.14)	$ (0.08)	$ (0.38)