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Investment in Laramie Energy, LLC - Additional Information (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |
Depreciation, depletion, and amortization | $ 21,283,000 | $ 20,957,000 |
Unrealized gain (loss) on derivative contracts | $ (28,351,000) | (5,255,000) |
Laramie Energy Company |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest in Laramie Energy, LLC | 46.00% |  |
Equity method investments, fair value | $ 1,874,000 |  | $ 46,905,000
Equity method investment, aggregate cost | 47,200,000 |  |
Impairment of our investment in Laramie Energy | 45,294,000 |  |
Depreciation, depletion, and amortization | 9,300,000 | 21,400,000 |
Unrealized gain (loss) on derivative contracts | 2,400,000 | $ 2,700,000 |
Revolving Credit Facility | Laramie Energy Company |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Credit facility, maximum borrowing amount | 400,000,000 |  |
Asset borrowing base | 220,000,000 |  |
Balance outstanding on the revolving credit facility | $ 190,000,000.0 |  |

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