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Derivative Instruments (Details) - Not Designated as Hedging Instrument - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Interest rate derivatives - caps      
Derivative [Line Items]      
Notional amount (in thousands) $ 917,500,000   $ 779,000,000
Aggregate principal balance on corresponding mortgage loans (in thousands) $ 725,000,000   $ 779,000,000
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) $ 192,500,000 $ 167,500,000  
Total cost of interest rate caps (in thousands) $ 20,000 $ 38,000  
Interest rate derivatives - caps | Minimum      
Derivative [Line Items]      
Strike rate 0.75% 3.00%  
Interest rate derivatives - caps | Maximum      
Derivative [Line Items]      
Strike rate 3.00% 3.50%