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Investment in Laramie Energy, LLC - Equity Method Investees Net income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]
Depreciation, depletion, and amortization	$ 22,880	$ 21,283
Unrealized (gain) loss on derivative instruments	(6,922)	28,351
Laramie Energy Company
Schedule of Equity Method Investments [Line Items]
Depreciation, depletion, and amortization	6,984	9,279
Unrealized (gain) loss on derivative instruments	$ (549)	$ (2,414)

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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-Publisher FASB
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