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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
CONSOLIDATED BALANCE SHEETS    
Oil and gas properties, unproved properties excluded from amortization (in dollars) $ 207,799us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization $ 204,626us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization
8% convertible preferred stock, par value (in dollars per share) $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
8% convertible preferred stock, authorized shares 10,000,000us-gaap_PreferredStockSharesAuthorized  
8% convertible preferred stock, issued shares 10,703us-gaap_PreferredStockSharesIssued 10,703us-gaap_PreferredStockSharesIssued
8% convertible preferred stock, outstanding shares 10,703us-gaap_PreferredStockSharesOutstanding 10,703us-gaap_PreferredStockSharesOutstanding
8% convertible preferred stock, aggregate liquidation preference (in dollars) 128us-gaap_PreferredStockLiquidationPreferenceValue 128us-gaap_PreferredStockLiquidationPreferenceValue
Preferred stock dividend rate (as a percent) 8.00%us-gaap_PreferredStockDividendRatePercentage 8.00%us-gaap_PreferredStockDividendRatePercentage
Common stock, par value (in dollars per share) $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized shares 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued shares 81,135,849us-gaap_CommonStockSharesIssued 80,754,225us-gaap_CommonStockSharesIssued
Accumulated other comprehensive income, applicable income taxes (in dollars) $ 134us-gaap_OtherComprehensiveIncomeLossTax $ 141us-gaap_OtherComprehensiveIncomeLossTax