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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