CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenues	$ 1,401,638	$ 909,781	$ 4,002,382	$ 2,531,616
Operating expenses
Cost of revenues (excluding depreciation)	1,265,755	822,785	3,578,329	2,232,608
Operating expense (excluding depreciation)	83,237	54,905	231,741	158,975
Depreciation, depletion, and amortization	22,227	13,192	65,103	39,004
General and administrative expense (excluding depreciation)	11,391	11,871	34,435	35,981
Acquisition and integration costs	623	2,134	4,325	3,515
Total operating expenses	1,383,233	904,887	3,913,933	2,470,083
Operating income	18,405	4,894	88,449	61,533
Other income (expense)
Interest expense and financing costs, net	(18,348)	(10,425)	(57,336)	(29,346)
Debt extinguishment and commitment costs	0	0	(9,186)	0
Other income, net	83	85	2,347	861
Change in value of common stock warrants	(826)	(1,067)	(3,065)	(396)
Change in value of contingent consideration	0	0	0	(10,500)
Equity earnings (losses) from Laramie Energy, LLC	(85,633)	1,050	(84,841)	4,274
Total other income (expense), net	(104,724)	(10,357)	(152,081)	(35,107)
Income (loss) before income taxes	(86,319)	(5,463)	(63,632)	26,426
Income tax benefit (expense)	2,428	(359)	69,002	(885)
Net income (loss)	$ (83,891)	$ (5,822)	$ 5,370	$ 25,541
Income (loss) per share
Basic (in dollars per share)	$ (1.65)	$ (0.13)	$ 0.11	$ 0.55
Diluted (in dollars per share)	$ (1.65)	$ (0.13)	$ 0.11	$ 0.55
Weighted-average number of shares outstanding
Basic (in shares)	50,942	45,709	49,973	45,676
Diluted (in shares)	50,942	45,709	50,071	45,721