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Investment in Laramie Energy, LLC - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Cash contributions |  |  | $ 0 | $ 55,000,000 |  |
Depreciation, depletion, and amortization | $ 11,304,000 | $ 9,643,000 | 33,848,000 | 19,839,000 |  |
Unrealized gain (loss) on derivative contracts |  |  | $ (557,000) | 5,804,000 |  |
Laramie Energy Company |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest in Laramie Energy, LLC | 42.30% |  | 42.30% |  |  |
Cash contributions |  |  |  |  | $ 55,000,000 | $ 27,500,000
Depreciation, depletion, and amortization | $ 12,300,000 | 13,500,000 | $ 38,100,000 | 34,100,000 |  |
Unrealized gain (loss) on derivative contracts | 2,300,000 | $ 12,700,000 | 35,200,000 | $ (16,800,000) |  |
Amount of equity in underlying assets exceeding carrying value by | 63,800,000 |  | $ 63,800,000 |  | $ 67,800,000 |
Amortization of natural gas and oil properties |  |  | 15 years |  |  |
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 | 210,000,000 |  | 210,000,000 |  |  |
Balance outstanding on the revolving credit facility | $ 149,000,000 |  | $ 149,000,000 |  |  |

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