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Derivative Instruments (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Credit default swaps      
Derivative [Line Items]      
Change in market value threshold for settlement $ 250,000    
Not Designated as Hedging Instrument | Interest rate derivatives - caps      
Derivative [Line Items]      
Notional amount (in thousands) 779,000,000 $ 968,000,000  
Aggregate principal balance on corresponding mortgage loans (in thousands) $ 779,000,000 $ 870,000,000  
Not Designated as Hedging Instrument | Interest rate derivatives - caps | Minimum      
Derivative [Line Items]      
Strike rate 3.00% 3.00%  
Not Designated as Hedging Instrument | Interest rate derivatives - caps | Maximum      
Derivative [Line Items]      
Strike rate 4.00% 7.80%  
Not Designated as Hedging Instrument | Interest rate derivatives - floors      
Derivative [Line Items]      
Notional amount (in thousands) $ 0 $ 5,000,000,000  
Not Designated as Hedging Instrument | Interest rate derivatives - floors | Minimum      
Derivative [Line Items]      
Strike rate   (0.25%)  
Not Designated as Hedging Instrument | Interest rate derivatives - floors | Maximum      
Derivative [Line Items]      
Strike rate   1.63%  
Not Designated as Hedging Instrument | Interest rate derivatives - caps      
Derivative [Line Items]      
Notional amount (in thousands) 602,500,000 $ 391,000,000 $ 727,000,000
Total cost of interest rate caps (in thousands) $ 92,000 $ 115,000 $ 362,000
Not Designated as Hedging Instrument | Interest rate derivatives - caps | Minimum      
Derivative [Line Items]      
Strike rate 3.00% 3.00% 2.43%
Not Designated as Hedging Instrument | Interest rate derivatives - caps | Maximum      
Derivative [Line Items]      
Strike rate 4.00% 7.80% 7.80%
Not Designated as Hedging Instrument | Interest rate derivatives - floors      
Derivative [Line Items]      
Notional amount (in thousands) $ 0 $ 2,000,000,000 $ 4,000,000,000
Total cost of interest rate caps (in thousands) $ 0 $ 75,000 $ 138,000
Not Designated as Hedging Instrument | Interest rate derivatives - floors | Minimum      
Derivative [Line Items]      
Strike rate 1.63% 1.38%
Not Designated as Hedging Instrument | Interest rate derivatives - floors | Maximum      
Derivative [Line Items]      
Strike rate 1.63% 2.00%