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Derivative Instruments (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Credit Default Swap      
Derivative [Line Items]      
Notional amount $ 50,000,000.0    
Maximum exposure 1,200,000    
Change in market value threshold for settlement 250,000    
Not Designated as Hedging Instrument | Interest rate caps      
Derivative [Line Items]      
Notional amount 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 caps | Minimum      
Derivative [Line Items]      
Strike rate (3.00%)   (3.00%)
Not Designated as Hedging Instrument | Interest rate caps | Maximum      
Derivative [Line Items]      
Strike rate (4.00%)   (7.80%)
Not Designated as Hedging Instrument | Interest rate floors      
Derivative [Line Items]      
Notional amount $ 0   $ 5,000,000,000
Not Designated as Hedging Instrument | Interest rate floors | Minimum      
Derivative [Line Items]      
Strike rate     (0.25%)
Not Designated as Hedging Instrument | Interest rate floors | Maximum      
Derivative [Line Items]      
Strike rate     (1.63%)
Not Designated as Hedging Instrument | Interest rate caps      
Derivative [Line Items]      
Notional amount 602,500,000 $ 348,500,000  
Total cost of interest rate caps (in thousands) $ 92,000 $ 89,000  
Not Designated as Hedging Instrument | Interest rate caps | Minimum      
Derivative [Line Items]      
Strike rate (3.00%) (3.00%)  
Not Designated as Hedging Instrument | Interest rate caps | Maximum      
Derivative [Line Items]      
Strike rate (4.00%) (7.80%)  
Not Designated as Hedging Instrument | Interest rate floors      
Derivative [Line Items]      
Notional amount $ 0 $ 2,000,000,000  
Strike rate 1.63%  
Total cost of interest rate caps (in thousands) $ 0 $ 75,000