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Repurchase Agreements (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 3,055,069 $ 3,013,110
Repurchage agreement, Weighted Average Interest Rate 0.63% 0.55%
Fair Value of Collateral Pledged $ 3,320,797 $ 3,274,597
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 18 days  
Securitization financing bond [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 7,402 $ 9,834
Repurchage agreement, Weighted Average Interest Rate 1.55% 1.51%
Fair Value of Collateral Pledged $ 8,474 $ 11,000
RMBS [Member] | Agency MBS [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 1,570,894 $ 1,977,338
Repurchage agreement, Weighted Average Interest Rate 0.45% 0.39%
Fair Value of Collateral Pledged $ 1,637,187 $ 2,064,704
RMBS [Member] | Non-Agency MBS [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 56,993 $ 17,594
Repurchage agreement, Weighted Average Interest Rate 1.59% 1.57%
Fair Value of Collateral Pledged $ 70,045 $ 21,787
CMBS [Member] | Agency MBS [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 596,612 $ 253,857
Repurchage agreement, Weighted Average Interest Rate 0.42% 0.36%
Fair Value of Collateral Pledged $ 643,278 $ 291,103
CMBS [Member] | Non-Agency MBS [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 162,501 $ 114,895
Repurchage agreement, Weighted Average Interest Rate 1.08% 1.15%
Fair Value of Collateral Pledged $ 184,039 $ 140,216
CMBS IO [Member] | Agency MBS [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 353,012 $ 372,609
Repurchage agreement, Weighted Average Interest Rate 1.01% 0.92%
Fair Value of Collateral Pledged $ 413,047 $ 430,638
CMBS IO [Member] | Non-Agency MBS [Member]    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements Accounted for as Secured Borrowings $ 307,655 $ 266,983
Repurchage agreement, Weighted Average Interest Rate 1.11% 1.04%
Fair Value of Collateral Pledged $ 364,727 $ 315,149