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Fair Value Disclosure - Reconciliation of Level 3 Investments (Details) - CMBS [Member]
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Fair value at December 31, 2016 $ 0
Transfers into Level III 254,484
Net realized loss on investments (4,076)
Net increase in unrealized gain on investments 13,488
Sales and repayments of investments (71,073)
Amortization of purchase discount, net (921)
Fair value at September 30, 2017 $ 191,902