CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenue	$ 974,717	$ 703,714	$ 598,155
Cost of goods sold before depreciation, depletion and amortization	768,839	573,318	498,660
Selling, general and administrative expenses	87,978	61,850	59,424
Depreciation, depletion and amortization	43,570	23,849	18,868
Loss on revaluation of contingent consideration, net	932	0	0
Gain on sale of assets, net	(468)	(625)	(232)
Income from operations	73,866	45,322	21,435
Interest expense, net	(21,734)	(20,431)	(11,332)
Derivative loss	(60,016)	(3,556)	(29,964)
Gain on early extinguishment of debt	0	11	985
Other income, net	3,569	2,385	1,771
(Loss) income from continuing operations before income taxes	(4,315)	23,731	(17,105)
Income tax expense	779	2,156	1,168
(Loss) income from continuing operations	(5,094)	21,575	(18,273)
Loss from discontinued operations, net of taxes	(320)	(993)	(1,856)
Net (loss) income	$ (5,414)	$ 20,582	$ (20,129)
Basic (loss) income per share:
Income (loss) from continuing operations	$ (0.36)	$ 1.59	$ (1.42)
Loss from discontinued operations, net of income tax (in dollars per share)	(0.02)	(0.07)	(0.14)
Net income (loss) per share - basic (in dollars per share)	(0.38)	1.52	(1.56)
Diluted (loss) income per share:
Income (loss) from continuing operations	(0.36)	1.55	(1.42)
Loss from discontinued operations, net of taxes (in dollars per share)	(0.02)	(0.07)	(0.14)
Net income (loss) per share - diluted (in dollars per share)	$ (0.38)	$ 1.48	$ (1.56)
Weighted average shares outstanding:
Basic (in shares)	14,080	13,541	12,917
Diluted (in shares)	14,080	13,898	12,917