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Repurchase Agreements (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 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 $ 3,402,964 $ 3,013,110
Repurchage agreement, Weighted Average Interest Rate 0.56% 0.55%
Fair Value of Collateral Pledged $ 3,690,154 $ 3,274,597
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 27 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 $ 8,211 $ 9,834
Repurchage agreement, Weighted Average Interest Rate 1.54% 1.51%
Fair Value of Collateral Pledged $ 8,999 $ 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 $ 1,786,642 $ 1,977,338
Repurchage agreement, Weighted Average Interest Rate 0.40% 0.39%
Fair Value of Collateral Pledged $ 1,856,421 $ 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 $ 57,775 $ 17,594
Repurchage agreement, Weighted Average Interest Rate 1.61% 1.57%
Fair Value of Collateral Pledged $ 69,906 $ 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 $ 740,454 $ 253,857
Repurchage agreement, Weighted Average Interest Rate 0.36% 0.36%
Fair Value of Collateral Pledged $ 807,758 $ 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 $ 168,920 $ 114,895
Repurchage agreement, Weighted Average Interest Rate 1.04% 1.15%
Fair Value of Collateral Pledged $ 194,021 $ 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 $ 360,837 $ 372,609
Repurchage agreement, Weighted Average Interest Rate 0.94% 0.92%
Fair Value of Collateral Pledged $ 420,519 $ 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 $ 280,125 $ 266,983
Repurchage agreement, Weighted Average Interest Rate 1.06% 1.04%
Fair Value of Collateral Pledged $ 332,530 $ 315,149