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Acquisitions and Divestitures - Divestitures (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of property | $ 12,800 | $ 5,774 | $ 12,333 | $ 1,075
Impairment |  | 6,887 | 4,684 | 46,109
Proved oil and gas properties |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Impairment |  | $ 3,600 |  | 9,400
Non-operated oil and natural gas properties |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Impairment |  |  | $ 3,600 | $ 9,400
Secured Promissory Note Due March 2017 |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Debt principal amount | $ 4,000 |  |  |
Debt stated interest rate (percent) | 10.00% |  |  |

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