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Investment in Laramie Energy, LLC - Narrative (Details) - USD ($)	Sep. 30, 2021	Jul. 01, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Principal amount of long-term debt	$ 583,000,000		$ 731,523,000
Laramie Energy Company
Schedule of Equity Method Investments [Line Items]
Ownership interest in Laramie Energy, LLC (in Percent)	46.00%
Debt instrument, face amount		$ 160,000,000
Investment in Laramie Energy, LLC	$ 0		$ 0
Laramie Energy Company \| Revolving Credit Facility
Schedule of Equity Method Investments [Line Items]
Principal amount of long-term debt	$ 152,200,000