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Derivative Instruments (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Jun. 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 819,000,000   $ 968,000,000
Aggregate principal balance on corresponding mortgage loans (in thousands) $ 819,000,000   $ 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 $ 3,000,000,000   $ 5,000,000,000
Not Designated as Hedging Instrument | Interest rate floors | Minimum      
Derivative [Line Items]      
Strike rate (0.25%)   (0.25%)
Not Designated as Hedging Instrument | Interest rate floors | Maximum      
Derivative [Line Items]      
Strike rate (0.25%)   1.63%
Not Designated as Hedging Instrument | Interest rate caps      
Derivative [Line Items]      
Notional amount $ 602,500,000 $ 228,500,000  
Total cost of interest rate caps (in thousands) $ 92,000 $ 62,000  
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