CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Operating revenues, net	$ 197,071	$ 178,968
Expenses:
Direct expenses	158,653	148,203
Selling, general and administrative expenses	9,328	8,266
Total operating expenses	167,981	156,469
Loss on disposal of assets, net	1,073	25
Equity in loss of unconsolidated affiliate	41	487
Operating income	27,976	21,987
Interest expense	7,364	7,409
Loss on debt extinguishment	29,216
Other income, net	(91)	(152)
Total expenses	36,489	7,257
(Loss) earnings before income taxes	(8,513)	14,730
Income tax (benefit) expense	(3,192)	5,892
Net (loss) earnings	$ (5,321)	$ 8,838
Weighted average shares outstanding:
Basic	15,480	15,474
Diluted	15,480	15,502
Net (loss) earnings per share:
Basic	$ (0.34)	$ 0.57
Diluted	$ (0.34)	$ 0.57