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Consolidated Statement Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statement Of Operations      
Revenues $ 316,032us-gaap_OilAndGasRevenue $ 337,664us-gaap_OilAndGasRevenue $ 219,058us-gaap_OilAndGasRevenue
Cost of Operations:      
Operating expenses 86,990us-gaap_OperatingCostsAndExpenses 105,444us-gaap_OperatingCostsAndExpenses 58,536us-gaap_OperatingCostsAndExpenses
Depreciation, depletion and amortization 175,744us-gaap_DepreciationDepletionAndAmortization 143,048us-gaap_DepreciationDepletionAndAmortization 66,564us-gaap_DepreciationDepletionAndAmortization
Impairment of oil and gas properties 476,721us-gaap_ImpairmentOfOilAndGasProperties 9,566us-gaap_ImpairmentOfOilAndGasProperties 53,072us-gaap_ImpairmentOfOilAndGasProperties
Goodwill impairment loss 259,238us-gaap_GoodwillImpairmentLoss    
Insurance proceeds (10,786)end_ProceedsFromInsurance    
General and administrative 14,827us-gaap_GeneralAndAdministrativeExpense 19,124us-gaap_GeneralAndAdministrativeExpense 21,085us-gaap_GeneralAndAdministrativeExpense
Total Expenses 1,002,734us-gaap_OperatingExpenses 277,182us-gaap_OperatingExpenses 199,257us-gaap_OperatingExpenses
Income (Loss) From Operations (686,702)us-gaap_OperatingIncomeLoss 60,482us-gaap_OperatingIncomeLoss 19,801us-gaap_OperatingIncomeLoss
Derivatives:      
Realized losses (175)us-gaap_DerivativeGainLossOnDerivativeNet    
Unrealized gains (losses) 10,818us-gaap_UnrealizedGainLossOnDerivatives (1,843)us-gaap_UnrealizedGainLossOnDerivatives 5,141us-gaap_UnrealizedGainLossOnDerivatives
Interest expense (108,934)us-gaap_InterestExpense (104,516)us-gaap_InterestExpense (84,122)us-gaap_InterestExpense
Letter of credit fees (8,492)us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts (33,425)us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts (21,903)us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts
Financing and transaction costs (10,954)us-gaap_SellingGeneralAndAdministrativeExpense (6,974)us-gaap_SellingGeneralAndAdministrativeExpense (6,016)us-gaap_SellingGeneralAndAdministrativeExpense
Loss on early extinguishment of financing agreements (34,297)end_NoncashGainLossOnEarlyExtinguishmentOfFinancingAgreements   (21,661)end_NoncashGainLossOnEarlyExtinguishmentOfFinancingAgreements
Litigation settlement expense (19,034)us-gaap_LitigationSettlementExpense    
Reorganization items (43,222)us-gaap_ReorganizationItems    
Unrealized gain (loss) on foreign currency exchange 5,710us-gaap_ForeignCurrencyTransactionGainLossUnrealized (3,116)us-gaap_ForeignCurrencyTransactionGainLossUnrealized 8,080us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Other income (expense) 338us-gaap_OtherNonoperatingIncomeExpense 355us-gaap_OtherNonoperatingIncomeExpense (11,318)us-gaap_OtherNonoperatingIncomeExpense
Total Other Expense (208,242)us-gaap_NonoperatingIncomeExpense (149,519)us-gaap_NonoperatingIncomeExpense (131,799)us-gaap_NonoperatingIncomeExpense
Loss Before Income Taxes (894,944)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (89,037)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (111,998)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Petroleum Revenue Tax ("PRT") Expense 4,900end_PetroleumRevenueTaxIncomeTaxExpenseBenefit 6,689end_PetroleumRevenueTaxIncomeTaxExpenseBenefit 16,973end_PetroleumRevenueTaxIncomeTaxExpenseBenefit
Corporate Tax Benefit (59,589)end_CorporateIncomeTaxExpenseBenefit (247)end_CorporateIncomeTaxExpenseBenefit (2,745)end_CorporateIncomeTaxExpenseBenefit
Income Tax Expense (Benefit) (54,689)us-gaap_IncomeTaxExpenseBenefit 6,442us-gaap_IncomeTaxExpenseBenefit 14,228us-gaap_IncomeTaxExpenseBenefit
Net Loss (840,255)us-gaap_NetIncomeLoss (95,479)us-gaap_NetIncomeLoss (126,226)us-gaap_NetIncomeLoss
Preferred Stock Dividends 1,329us-gaap_PreferredStockDividendsIncomeStatementImpact 1,823us-gaap_PreferredStockDividendsIncomeStatementImpact 1,823us-gaap_PreferredStockDividendsIncomeStatementImpact
Net Loss to Common Stockholders $ (841,584)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (97,302)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (128,049)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net Loss per Common Share:      
Basic and Diluted $ (16.61)us-gaap_EarningsPerShareBasicAndDiluted $ (2.07)us-gaap_EarningsPerShareBasicAndDiluted $ (3.01)us-gaap_EarningsPerShareBasicAndDiluted
Weighted Average Number of Common Shares Outstanding:      
Basic and Diluted 50,674us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 47,088us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 42,533us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted