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Repurchase Agreements (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 2,540,759   $ 2,898,952
Secured borrowing, weighted average interest rate 1.47%   1.03%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 2,747,457   $ 3,149,839
Weighted average maturity remaining 19 days 20 days  
Securitization financing bond      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 3,912   $ 4,803
Secured borrowing, weighted average interest rate 2.45%   2.00%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 4,249   $ 5,278
CMBS | Agency MBS      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 1,192,447   $ 1,005,726
Secured borrowing, weighted average interest rate 1.21%   0.82%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 1,252,560   $ 1,095,002
CMBS | Non-Agency MBS      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 31,407   $ 66,881
Secured borrowing, weighted average interest rate 2.23%   1.63%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 38,934   $ 77,840
CMBS IO | Agency MBS      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 353,922   $ 346,892
Secured borrowing, weighted average interest rate 2.04%   1.57%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 415,988   $ 407,481
CMBS IO | Non-Agency MBS      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 293,725   $ 291,199
Secured borrowing, weighted average interest rate 2.13%   1.67%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 343,600   $ 341,139
RMBS | Agency MBS      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 665,346   $ 1,157,302
Secured borrowing, weighted average interest rate 1.29%   0.82%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 692,126   $ 1,191,147
RMBS | Non-Agency MBS      
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]      
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount $ 0   $ 26,149
Secured borrowing, weighted average interest rate 0.00%   1.98%
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements $ 0   $ 31,952