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Derivative Instruments and Hedging Activities - Components of Investment Fair Value Changes (Details) - Trading - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Realized Gains (Losses) $ 438 $ 921 $ 3,651 $ 921
Unrealized Gains (Losses) 20,555 24,022 34,553 24,022
Interest rate caps        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Realized Gains (Losses) 1,568 921 6,388 921
Unrealized Gains (Losses) (1,143) $ 24,022 (130) $ 24,022
Options        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Realized Gains (Losses) (1,130)   (2,737)  
Unrealized Gains (Losses) 974   0  
Interest rate swaps        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Realized Gains (Losses) 0   0  
Unrealized Gains (Losses) $ 20,724   $ 34,683