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Equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Investment fair value changes, net $ 128,049 $ (588,438) $ 35,500
Realized gains, net (17,993) (30,424) (23,821)
Net income before provision for income taxes 338,091 (586,455) 176,623
Interest expense 426,749 448,005 $ 479,808
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gains on Available-for-Sale Securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Investment fair value changes, net (388) 388  
Realized gains, net (16,461) (12,553)  
Net income before provision for income taxes (16,849) (12,165)  
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income before provision for income taxes 4,127 3,188  
Interest expense $ 4,127 $ 3,188