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Investment in Laramie Energy, LLC - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 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 | $ 11,284,000 | $ 5,100,000 | 22,544,000 | 10,196,000 |  |
Unrealized gain (loss) on derivative contracts |  |  | $ (3,656,000) | 5,408,000 |  |
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
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 | 131,000,000 |  | 131,000,000 |  |  |
Depreciation, depletion, and amortization | 12,500,000 | 13,000,000 | 25,800,000 | 20,600,000 |  |
Unrealized gain (loss) on derivative contracts | 8,700,000 | $ (35,400,000) | 32,900,000 | $ (29,500,000) |  |
Amount of equity in underlying assets exceeding carrying value by | $ 65,100,000 |  | $ 65,100,000 |  | $ 67,800,000 |
Amortization of natural gas and oil properties |  |  | 15 years |  |  |

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