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Monetary Production Payments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Aug. 31, 2013
May 31, 2013
Debt Instrument [Line Items]      
Monetary production payment $ 166,667end_MonetaryProductionPayment    
Alba And Bacchus Fields [Member]      
Debt Instrument [Line Items]      
Monetary production payment $ 25,000end_MonetaryProductionPayment
/ us-gaap_DebtInstrumentAxis
= end_AlbaAndBacchusFieldsMember		 $ 25,000end_MonetaryProductionPayment
/ us-gaap_DebtInstrumentAxis
= end_AlbaAndBacchusFieldsMember		 $ 125,000end_MonetaryProductionPayment
/ us-gaap_DebtInstrumentAxis
= end_AlbaAndBacchusFieldsMember
Effective rate 9.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= end_AlbaAndBacchusFieldsMember		 8.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= end_AlbaAndBacchusFieldsMember		 10.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= end_AlbaAndBacchusFieldsMember