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Investment in Laramie Energy, LLC - Equity Method Investees Net income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]
Depreciation, depletion, and amortization	$ 23,548	$ 22,128	$ 46,428	$ 43,411
Unrealized (gain) loss on derivative instruments			(5,517)	2,048
Laramie Energy Company
Schedule of Equity Method Investments [Line Items]
Depreciation, depletion, and amortization	8,772	10,042	15,756	19,321
Unrealized (gain) loss on derivative instruments	$ 731	$ 4,139	$ 182	$ 1,725

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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-Section 45
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