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Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Net Investment Income [Line Items]        
Gross investment income $ 173,623 $ 170,305 $ 349,108 $ 330,332
Investment expense (2,049) (2,118) (4,022) (3,568)
Net investment income 171,574 168,187 345,086 326,764
Fixed maturity securities, including cash and cash equivalents and loans receivable        
Net Investment Income [Line Items]        
Gross investment income 124,389 96,996 225,673 191,673
Investment funds        
Net Investment Income [Line Items]        
Investment funds 33,861 61,311 85,874 100,246
Equity securities        
Net Investment Income [Line Items]        
Gross investment income 12,797 7,212 23,653 13,392
Arbitrage trading account        
Net Investment Income [Line Items]        
Gross investment income 4,127 3,914 13,313 22,989
Real estate        
Net Investment Income [Line Items]        
Gross investment income $ (1,551) $ 872 $ 595 $ 2,032