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Investment in Laramie Energy, LLC - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments | $ 0 |  |  | $ 0 |  |  | $ 46,905,000
Depreciation, depletion, and amortization | $ 22,821,000 |  | $ 22,227,000 | 66,232,000 | $ 65,103,000 |  |
Unrealized gain (loss) on derivative contracts |  |  |  | $ 2,733,000 | (6,328,000) |  |
Laramie Energy Company |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership interest in Laramie Energy, LLC | 46.00% |  |  | 46.00% |  |  |
Equity method investments, fair value | $ 0 | $ 1,900,000 |  | $ 0 |  |  | $ 46,905,000
Equity method investment, aggregate cost |  | 47,200,000 |  |  |  |  |
Impairment of our investment in Laramie Energy |  | $ 45,300,000 |  | 45,294,000 |  |  |
Equity method investments |  |  |  |  |  | $ 0 |
Depreciation, depletion, and amortization | 9,000,000.0 |  | 20,700,000 | 28,300,000 | 63,100,000 |  |
Unrealized gain (loss) on derivative contracts | (5,900,000) |  | $ (4,300,000) | (7,600,000) | $ 6,800,000 |  |
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 | 200,900,000 |  |  | 200,900,000 |  |  |
Balance outstanding on the revolving credit facility | $ 200,000,000.0 |  |  | $ 200,000,000.0 |  |  |

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