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Financial Derivatives (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Derivative [Line Items]    
Low Range Of Spread On Written Credit Derivatives 0.15%efc_LowRangeOfSpreadOnWrittenCreditDerivatives 0.15%efc_LowRangeOfSpreadOnWrittenCreditDerivatives
High Range Of Spread On Written Credit Derivatives 5.00%efc_HighRangeOfSpreadOnWrittenCreditDerivatives 5.00%efc_HighRangeOfSpreadOnWrittenCreditDerivatives
Credit Default Swap, Selling Protection [Member]    
Derivative [Line Items]    
Total net up-front payments received $ 41.1efc_UpFrontFeesReceivedOnCreditDerivatives
/ us-gaap_CreditDerivativesByContractTypeAxis
= us-gaap_CreditDefaultSwapSellingProtectionMember		 $ 28.9efc_UpFrontFeesReceivedOnCreditDerivatives
/ us-gaap_CreditDerivativesByContractTypeAxis
= us-gaap_CreditDefaultSwapSellingProtectionMember