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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2016
Laramie Energy Company |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Other than temporary impairment charge | $ 0 | $ 0 | $ 41,081 |
5% Convertible Senior Notes due 2021 |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Debt instrument, interest rate | 5.00% |  |  | 5.00%
7.75% Senior Secured Note due 2025 |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Debt instrument, interest rate | 7.75% |  |  |

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