CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues	$ 515,301	$ 1,409,409	$ 1,719,384	$ 2,600,744
Operating expenses
Cost of revenues (excluding depreciation)	441,278	1,251,842	1,651,489	2,312,574
Operating expense (excluding depreciation)	67,027	74,830	140,418	148,504
Depreciation, depletion, and amortization	22,128	21,919	43,411	42,876
Impairment expense	0	0	67,922	0
General and administrative expense (excluding depreciation)	10,221	11,379	22,005	23,044
Acquisition and integration costs	90	818	755	3,702
Total operating expenses	540,744	1,360,788	1,926,000	2,530,700
Operating income (loss)	(25,443)	48,621	(206,616)	70,044
Other income (expense)
Interest expense and financing costs, net	(16,414)	(20,278)	(35,088)	(38,988)
Debt extinguishment and commitment costs	0	(3,690)	0	(9,186)
Other income, net	455	2,177	479	2,264
Change in value of common stock warrants	0	(957)	4,270	(2,239)
Equity earnings (losses) from Laramie Energy, LLC	(1,874)	491	(46,905)	792
Total other income (expense), net	(17,833)	(22,257)	(77,244)	(47,357)
Income (loss) before income taxes	(43,276)	26,364	(283,860)	22,687
Income tax benefit	2,716	1,805	20,963	66,574
Net income (loss)	$ (40,560)	$ 28,169	$ (262,897)	$ 89,261
Income (loss) per share
Basic (in dollars per share)	$ (0.76)	$ 0.56	$ (4.94)	$ 1.78
Diluted (in dollars per share)	$ (0.76)	$ 0.56	$ (4.94)	$ 1.75
Weighted-average number of shares outstanding
Basic (in shares)	53,265	49,960	53,246	49,529
Diluted (in shares)	53,265	50,074	53,246	55,580