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Fair Value of Financial Instruments Recorded basis and Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
U.S. Treasuries $ 0 $ 146,530
Derivative assets 6,563 2,940
Derivative liabilities 1,218 269
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage-backed securities 3,749,464 3,026,989
U.S. Treasuries 0 146,530
Mortgage loans held for investment, net 11,527 15,738
Derivative assets 6,563 2,940
Repurchase agreements 3,267,984 2,565,902
Non-recourse collateralized financing 3,458 5,520
Derivative liabilities 1,218 269
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage-backed securities 3,749,464 3,026,989
U.S. Treasuries 0 146,530
Mortgage loans held for investment, net [1] 8,566 12,973
Derivative assets 6,563 2,940
Repurchase agreements 3,267,984 [2] 2,565,902
Non-recourse collateralized financing, fair value [1] 3,475 5,554
Derivative liabilities $ 1,218 $ 269
[1] The Company determines the fair value of its mortgage loans held for investment, net and its non-recourse collateralized financing using internally developed cash flow models with inputs similar to those used to estimate the fair value of the Company’s Level 3 non-Agency MBS.
[2] The carrying value of repurchase agreements generally approximates fair value due to their short-term maturities.