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Derivative Instruments (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Interest rate derivatives - caps      
Derivative [Line Items]      
Notional amount (in thousands) $ 962,500   $ 779,000
Aggregate principal balance on corresponding mortgage loans (in thousands) $ 857,250   $ 779,000
Interest rate derivatives - caps | Minimum      
Derivative [Line Items]      
Strike rate 0.75%   3.00%
Interest rate derivatives - caps | Maximum      
Derivative [Line Items]      
Strike rate 4.00%   4.00%
Interest rate derivatives - caps      
Derivative [Line Items]      
Notional amount (in thousands) $ 882,500 $ 602,500  
Total cost of interest rate caps (in thousands) $ 200 $ 92  
Interest rate derivatives - caps | Minimum      
Derivative [Line Items]      
Strike rate 0.75% 3.00%  
Interest rate derivatives - caps | Maximum      
Derivative [Line Items]      
Strike rate 4.00% 4.00%