Quarterly report pursuant to Section 13 or 15(d)

Collateralized Borrowings in Securitization Trusts, at Fair Value (Details)

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Collateralized Borrowings in Securitization Trusts, at Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Collateralized borrowings in securitization trust, at fair value $ 1,400,571us-gaap_LongTermDebtFairValue $ 1,209,663us-gaap_LongTermDebtFairValue
Debt, Weighted Average Interest Rate 3.60%us-gaap_DebtWeightedAverageInterestRate 3.60%us-gaap_DebtWeightedAverageInterestRate