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Fair Value of Financial Instruments Recorded basis and Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets $ 6,030 $ 6,563
Derivative liabilities 0 1,218
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage-backed securities 4,842,447 3,749,464
Mortgage loans held for investment, net 10,862 11,527
Derivative assets 6,030 6,563
Repurchase agreements 4,252,893 3,267,984
Non-recourse collateralized financing 3,219 3,458
Derivative liabilities 0 1,218
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage-backed securities 4,842,447 3,749,464
Mortgage loans held for investment, net [1] 7,458 8,566
Derivative assets 6,030 6,563
Repurchase agreements 4,252,893 [2] 3,267,984
Non-recourse collateralized financing, fair value [1] 3,073 3,475
Derivative liabilities $ 0 $ 1,218
[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.