Annual report pursuant to Section 13 and 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
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Collateralized borrowings in securitization trusts, at fair value $ 3,037,196 $ 2,000,110
Debt, Weighted Average Interest Rate 3.40% 3.60%