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Assets Held for Sale (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Impairment | $ 3,562,000 | $ 5,321,000 |
Oil and gas properties | 121,137,000 |  |
Other property and equipment | 34,000 |  |
Less: accumulated depreciation, depletion, amortization and impairment | (95,326,000) |  |
Total assets | 25,845,000 |  | $ 26,728,000
Asset retirement obligation | (10,155,000) |  |
Total liabilities | (10,155,000) |  |
Net assets | 15,690,000 |  |
Proved Oil And Gas Properties [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Impairment | 0 | $ 0 |
Proved Oil And Gas Properties [Member] | Assets held for sale [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Impairment | $ 3,600,000 |  | $ 9,400,000

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