CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues	$ 689,981	$ 1,401,638	$ 2,409,365	$ 4,002,382
Operating expenses
Cost of revenues (excluding depreciation)	585,289	1,265,755	2,236,778	3,578,329
Operating expense (excluding depreciation)	69,458	83,237	209,876	231,741
Depreciation, depletion, and amortization	22,821	22,227	66,232	65,103
Impairment expense	0	0	67,922	0
General and administrative expense (excluding depreciation)	9,818	11,391	31,823	34,435
Acquisition and integration costs	(155)	623	600	4,325
Total operating expenses	687,231	1,383,233	2,613,231	3,913,933
Operating income (loss)	2,750	18,405	(203,866)	88,449
Other income (expense)
Interest expense and financing costs, net	(17,523)	(18,348)	(52,611)	(57,336)
Debt extinguishment and commitment costs	0	0	0	(9,186)
Other income, net	610	83	1,089	2,347
Change in value of common stock warrants	0	(826)	4,270	(3,065)
Equity losses from Laramie Energy, LLC	0	(85,633)	(46,905)	(84,841)
Total other income (expense), net	(16,913)	(104,724)	(94,157)	(152,081)
Loss before income taxes	(14,163)	(86,319)	(298,023)	(63,632)
Income tax benefit (expense)	(108)	2,428	20,855	69,002
Net income (loss)	$ (14,271)	$ (83,891)	$ (277,168)	$ 5,370
Income (loss) per share
Basic (in dollars per share)	$ (0.27)	$ (1.65)	$ (5.20)	$ 0.11
Diluted (in dollars per share)	$ (0.27)	$ (1.65)	$ (5.20)	$ 0.11
Weighted-average number of shares outstanding
Basic (in shares)	53,374	50,942	53,265	49,973
Diluted (in shares)	53,374	50,942	53,265	50,071