Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue:
Freight revenue	$ 143,335	$ 126,244
Fuel surcharge revenue	23,881	34,713
Total revenue	167,216	160,957
Operating expenses:
Salaries, wages, and related expenses	58,253	52,874
Fuel expense	31,894	43,176
Operations and maintenance	10,797	12,031
Revenue equipment rentals and purchased transportation	23,208	25,335
Operating taxes and licenses	2,661	2,745
Insurance and claims	10,769	6,106
Communications and utilities	1,527	1,437
General supplies and expenses	3,682	3,809
Depreciation and amortization, including gains and losses on disposition of property and equipment	14,382	13,090
Total operating expenses	157,173	160,603
Operating income	10,043	354
Other expenses (income):
Interest expense	2,204	2,751
Interest income		(4)
Other expenses, net	2,204	2,747
Equity in income of affiliate	1,385	800
Income (loss) before income taxes	9,224	(1,593)
Income tax benefit	(1,003)	(219)
Net income (loss)	$ 10,227	$ (1,374)
Income (loss) per share:
Basic and diluted net income (loss) per share (in Dollars per share)	$ 0.56	$ (0.09)
Basic weighted average shares outstanding (in Shares)	18,145	14,915
Diluted weighted average shares outstanding (in Shares)	18,307	14,915