CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Revenues	$ 715,505	$ 689,981	$ 515,301	$ 1,204,083	$ 1,399,134	$ 1,401,638	$ 1,409,409	$ 1,191,335	$ 3,124,870	$ 5,401,516	$ 3,410,728
Operating expenses
Cost of revenues (excluding depreciation)									2,947,697	4,803,589	3,003,116
Operating expense (excluding depreciation)									277,427	312,899	215,284
Depreciation, depletion, and amortization									90,036	86,121	52,642
Asset impairment loss									85,806	0	0
General and administrative expense (excluding depreciation)									41,288	46,223	47,426
Acquisition and integration costs									614	4,704	10,319
Total operating expenses									3,442,868	5,253,536	3,328,787
Operating income (loss)	(114,132)	2,750	(25,443)	(181,173)	59,531	18,405	48,621	21,423	(317,998)	147,980	81,941
Other income (expense)
Interest expense and financing costs, net									(70,222)	(74,839)	(39,768)
Debt extinguishment and commitment costs									0	(11,587)	(4,224)
Other income, net									1,049	2,516	1,046
Change in value of common stock warrants									4,270	(3,199)	1,801
Change in value of contingent consideration									0	0	(10,500)
Equity earnings (losses) from Laramie Energy, LLC									(46,905)	(89,751)	9,464
Total other expense, net									(111,808)	(176,860)	(42,181)
Income (loss) before income taxes									(429,806)	(28,880)	39,760
Income tax benefit (expense)									20,720	69,689	(333)
Net income (loss)	$ (131,918)	$ (14,271)	$ (40,560)	$ (222,337)	$ 35,439	$ (83,891)	$ 28,169	$ 61,092	$ (409,086)	$ 40,809	$ 39,427
Income (loss) per share
Basic (USD per share)	$ (2.47)	$ (0.27)	$ (0.76)	$ (4.18)	$ 0.68	$ (1.65)	$ 0.56	$ 1.23	$ (7.68)	$ 0.80	$ 0.85
Diluted (USD per share)	$ (2.47)	$ (0.27)	$ (0.76)	$ (4.18)	$ 0.68	$ (1.65)	$ 0.56	$ 1.14	$ (7.68)	$ 0.80	$ 0.85
Weighted-average number of shares outstanding
Basic (in shares)									53,295	50,352	45,726
Diluted (in shares)									53,295	50,470	45,755