Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue:
Operating revenue	$ 153,618	$ 141,822	$ 452,405	$ 413,587
Operating expenses:
Salaries, wages and employee benefits	39,388	34,771	113,930	105,001
Fuel expense	28,449	33,224	92,156	101,837
Depreciation and amortization	10,671	11,633	33,274	33,399
Insurance and claims	6,466	6,807	18,353	19,220
Operations and maintenance	12,863	12,319	37,554	37,476
Purchased transportation	43,755	37,470	129,543	103,677
Operating taxes and licenses	1,414	1,400	4,215	4,104
Communications and utilities	1,026	1,014	3,159	3,084
Gain on disposal of assets, net	(302)	(626)	(824)	(1,444)
Other	4,469	4,014	12,412	11,208
Total operating expenses	148,199	142,026	443,772	417,562
Operating income (loss)	5,419	(204)	8,633	(3,975)
Other expenses (income):
Interest expense	816	967	2,271	2,752
Defense costs	65		2,593
Other, net	4	(611)	52	(711)
Total other expenses, net	885	356	4,916	2,041
Income (loss) before income taxes	4,534	(560)	3,717	(6,016)
Income tax expense (benefit)	1,817	42	1,867	(1,542)
Net income (loss) and Comprehensive income (loss)	$ 2,717	$ (602)	$ 1,850	$ (4,474)
Net income (loss) per share information:
Average shares outstanding (Basic) (in Shares)	10,357	10,322	10,350	10,324
Basic earnings (loss) per share (in Dollars per share)	$ 0.26	$ (0.06)	$ 0.18	$ (0.43)
Average shares outstanding (Diluted) (in Shares)	10,476	10,322	10,482	10,324
Diluted earnings (loss) per share (in Dollars per share)	$ 0.26	$ (0.06)	$ 0.18	$ (0.43)