CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues
Revenues	$ 1,865,045	$ 2,066,337	$ 3,108,025
Operating expenses
Cost of revenues (excluding depreciation)	1,636,339	1,787,368	2,937,472
Operating expense (excluding depreciation)	166,069	136,338	140,900
Lease operating expense	147	5,283	5,673
Depreciation, depletion and amortization	31,617	19,918	14,897
Impairment expense	0	9,639	0
Loss on sale of assets, net	0	0	624
General and administrative expense	42,073	44,271	34,304
Acquisition and integration expense	5,294	2,006	11,687
Total operating expenses	1,881,539	2,004,823	3,145,557
Operating income (loss)	(16,494)	61,514	(37,532)
Other income (expense)
Interest expense and financing costs, net	(28,506)	(20,156)	(17,995)
Loss on termination of financing agreements	0	(19,669)	(1,788)
Other income (expense), net	(98)	(291)	(312)
Change in value of common stock warrants	2,962	(3,664)	4,433
Change in value of contingent consideration	10,770	(18,450)	2,849
Equity earnings (losses) from Laramie Energy, LLC	(22,381)	(55,983)	2,849
Total other income (expense), net	(37,253)	(118,213)	(9,964)
Loss before income taxes	(53,747)	(56,699)	(47,496)
Income tax benefit	7,912	16,788	455
Net loss	$ (45,835)	$ (39,911)	$ (47,041)
Loss per share
Basic (USD per share)	$ (1.08)	$ (1.06)	$ (1.44)
Diluted (USD per share)	$ (1.08)	$ (1.06)	$ (1.44)
Weighted-average number of shares outstanding
Basic (in shares)	42,349	37,678	32,739
Diluted (in shares)	42,349	37,678	32,739