Investment in Laramie Energy, LLC - Equity Method Investees Net loss (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Asset impairment loss	$ 85,806	$ 0	$ 0
Depreciation, depletion, and amortization	90,036	86,121	52,642
Unrealized (gain) loss on derivative contracts	(3,322)	9,350	2,122
Laramie Energy Company
Schedule of Equity Method Investments [Line Items]
Asset impairment loss	0	355,220	0
Depreciation, depletion, and amortization	34,966	82,632	66,604
Unrealized (gain) loss on derivative contracts	$ 4,245	$ (4,283)	$ 4,063

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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