Fair Value of Financial Instruments Recorded basis and Fair Value (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets		$ 4,290	$ 6,563
Derivative liabilities		974	1,218
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage-backed securities		5,188,163	3,749,464
Mortgage loans held for investment, net	[1]	9,405	11,527
Derivative assets		4,290	6,563
Repurchase agreements	[2]		3,267,984
Non-recourse collateralized financing	[1]	2,733	3,458
Derivative liabilities		974	1,218
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage-backed securities		5,188,163	3,749,464
Mortgage loans held for investment, net	[1]	8,642	8,566
Derivative assets		4,290	6,563
Repurchase agreements	[2]	4,752,348	3,267,984
Non-recourse collateralized financing	[1]	2,743	3,475
Derivative liabilities		$ 974	$ 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.