CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenues	$ 1,409,409	$ 856,396	$ 2,600,744	$ 1,621,835
Operating expenses
Cost of revenues (excluding depreciation)	1,251,842	747,924	2,312,574	1,409,823
Operating expense (excluding depreciation)	74,830	53,060	148,504	104,070
Depreciation, depletion, and amortization	21,919	12,775	42,876	25,812
General and administrative expense (excluding depreciation)	11,379	12,905	23,044	24,110
Acquisition and integration costs	818	749	3,702	1,381
Total operating expenses	1,360,788	827,413	2,530,700	1,565,196
Operating income	48,621	28,983	70,044	56,639
Other income (expense)
Interest expense and financing costs, net	(20,278)	(10,544)	(38,988)	(18,921)
Debt extinguishment and commitment costs	(3,690)	0	(9,186)	0
Other income, net	2,177	657	2,264	776
Change in value of common stock warrants	(957)	(74)	(2,239)	671
Change in value of contingent consideration	0	0	0	(10,500)
Equity earnings (losses) from Laramie Energy, LLC	491	(2,352)	792	3,224
Total other income (expense), net	(22,257)	(12,313)	(47,357)	(24,750)
Income before income taxes	26,364	16,670	22,687	31,889
Income tax benefit (expense)	1,805	(492)	66,574	(526)
Net income	$ 28,169	$ 16,178	$ 89,261	$ 31,363
Income per share
Basic (in dollars per share)	$ 0.56	$ 0.35	$ 1.78	$ 0.68
Diluted (in dollars per share)	$ 0.56	$ 0.35	$ 1.75	$ 0.68
Weighted-average number of shares outstanding
Basic (in shares)	49,960	45,684	49,529	45,659
Diluted (in shares)	50,074	45,723	55,580	45,700