CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues	$ 1,191,335	$ 765,439
Operating expenses
Cost of revenues (excluding depreciation)	1,060,732	661,899
Operating expense (excluding depreciation)	73,674	51,010
Depreciation, depletion, and amortization	20,957	13,037
General and administrative expense (excluding depreciation)	11,665	11,205
Acquisition and integration costs	2,884	632
Total operating expenses	1,169,912	737,783
Operating income	21,423	27,656
Other income (expense)
Interest expense and financing costs, net	(18,710)	(8,377)
Debt extinguishment and commitment costs	(5,496)	0
Other income, net	87	119
Change in value of common stock warrants	(1,282)	745
Change in value of contingent consideration	0	(10,500)
Equity earnings from Laramie Energy, LLC	301	5,576
Total other income (expense), net	(25,100)	(12,437)
Income (loss) before income taxes	(3,677)	15,219
Income tax benefit (expense)	64,769	(34)
Net income	$ 61,092	$ 15,185
Income per share
Basic (in dollars per share)	$ 1.23	$ 0.33
Diluted (in dollars per share)	$ 1.14	$ 0.33
Weighted-average number of shares outstanding
Basic (in shares)	49,127	45,634
Diluted (in shares)	55,550	45,677