CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Revenue	$ 162,520	$ 138,178	$ 290,261	$ 249,093
Cost of goods sold before depreciation, depletion and amortization	132,720	118,182	243,877	216,847
Selling, general and administrative expenses	16,400	13,580	30,922	27,223
Depreciation, depletion and amortization	4,570	3,771	9,424	7,393
Gain on sale of assets	(31)	(8)	(26)	(599)
Income (loss) from operations	8,861	2,653	6,064	(1,771)
Interest expense, net	(2,588)	(2,905)	(5,360)	(5,774)
Derivative loss	(1,916)	(577)	(20,362)	(3,968)
(Loss) gain on extinguishment of debt	(6)	0	4,304	0
Other income, net	499	989	997	1,520
Income (loss) from continuing operations before income taxes	4,850	160	(14,357)	(9,993)
Income tax benefit (expense)	3,088	(106)	8,285	(294)
Income (loss) from continuing operations	7,938	54	(6,072)	(10,287)
Loss from discontinued operations, net of taxes	(1,263)	(362)	(1,617)	(251)
Net income (loss)	$ 6,675	$ (308)	$ (7,689)	$ (10,538)
Basic income (loss) per share:
Loss from continuing operations (usd per share)	$ 0.63	$ 0.00	$ (0.49)	$ (0.85)
(Loss) income from discontinued operations, net of taxes (usd per share)	$ (0.10)	$ (0.03)	$ (0.13)	$ (0.02)
Net loss per share – basic (usd per share)	$ 0.53	$ (0.03)	$ (0.62)	$ (0.87)
Diluted income (loss) per share:
Income (loss) from continuing operations (usd per share)	$ 0.59	$ 0.00	$ (0.49)	$ (0.85)
Loss from discontinued operations, net of taxes (usd per share)	$ (0.09)	$ (0.03)	$ (0.13)	$ (0.02)
Net income (loss) per share – diluted (usd per share)	$ 0.50	$ (0.03)	$ (0.62)	$ (0.87)
Weighted average shares outstanding:
Basic weighted average common shares outstanding	12,550	12,163	12,455	12,152
Denominator for diluted earnings per share	13,634	12,163	12,455	12,152