Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue:
Operating revenue	$ 132,887	$ 145,489
Operating expenses:
Salaries, wages and employee benefits	37,872	35,839
Fuel expense	17,978	33,003
Depreciation and amortization	10,671	11,455
Insurance and claims	6,194	5,984
Operations and maintenance	12,140	13,062
Purchased transportation	38,770	41,250
Operating taxes and licenses	1,320	1,446
Communications and utilities	863	1,039
Gain on disposal of assets	(503)	(343)
Other	3,991	3,797
Total operating expenses	129,296	146,532
Operating income (loss)	3,591	(1,043)
Other expenses (income):
Interest expense, net	630	711
Defense costs		365
Loss on extinguishment of debt	750
Other, net	202	64
Total other expenses, net	1,582	1,140
Income (loss) before income taxes	2,009	(2,183)
Income tax expense (benefit)	893	(594)
Net income (loss) and comprehensive income (loss)	$ 1,116	$ (1,589)
Net income (loss) per share information:
Average shares outstanding (basic) (in Shares)	10,395	10,339
Basic earnings (loss) per share (in Dollars per share)	$ 0.11	$ (0.15)
Average shares outstanding (diluted) (in Shares)	10,516	10,339
Diluted earnings (loss) per share (in Dollars per share)	$ 0.11	$ (0.15)