Investment in Laramie Energy, LLC - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Depreciation, depletion, and amortization	$ 22,227,000	$ 13,192,000	$ 65,103,000	$ 39,004,000
Unrealized gain (loss) on derivative contracts			$ (6,328,000)	(8,105,000)
Laramie Energy Company
Schedule of Equity Method Investments [Line Items]
Ownership interest in Laramie Energy, LLC	46.00%		46.00%
Fair value of investment	$ 51,815,000		$ 51,815,000		$ 136,656,000
Investment in Laramie Energy, LLC	133,300,000		133,300,000
Impairment of equity method investment	81,500,000		81,515,000
Depreciation, depletion, and amortization	20,700,000	20,700,000	63,100,000	52,700,000
Unrealized gain (loss) on derivative contracts	(4,300,000)	$ (3,200,000)	6,800,000	$ (6,700,000)
Amount of equity in underlying assets exceeding carrying value by	161,800,000		161,800,000		$ 85,200,000
Revolving Credit Facility \| Laramie Energy Company
Schedule of Equity Method Investments [Line Items]
Credit facility, maximum borrowing amount	400,000,000		400,000,000
Asset borrowing base	240,000,000		240,000,000
Balance outstanding on the revolving credit facility	$ 204,700,000		$ 204,700,000

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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