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Derivative Instruments (Details) - Not Designated as Hedging Instrument - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest rate derivatives - caps      
Derivative [Line Items]      
Notional amount (in thousands) $ 882,500,000 $ 779,000,000  
Aggregate principal balance on corresponding mortgage loans (in thousands) $ 857,000,000 $ 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) $ 882,500,000 $ 602,500,000 $ 391,000,000
Total cost of interest rate caps (in thousands) $ 200,000 $ 92,000 $ 115,000
Interest rate derivatives - caps | Minimum      
Derivative [Line Items]      
Strike rate 0.75% 3.00% 3.00%
Interest rate derivatives - caps | Maximum      
Derivative [Line Items]      
Strike rate 4.00% 4.00% 7.80%
Interest rate derivatives - floors      
Derivative [Line Items]      
Notional amount (in thousands) $ 0 $ 0 $ 2,000,000,000
Total cost of interest rate caps (in thousands) $ 0 $ 0 $ 75,000
Interest rate derivatives - floors | Minimum      
Derivative [Line Items]      
Strike rate 1.63%
Interest rate derivatives - floors | Maximum      
Derivative [Line Items]      
Strike rate 1.63%