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Investments (Fixed Maturities Securities Proceeds) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Proceeds from maturities/prepayments $ 7,898,232 $ 267,555
Fixed maturities | Available-for-sale    
Debt Securities, Available-for-sale [Line Items]    
Proceeds from sales 7,557,132 195,978
Proceeds from maturities/prepayments 138,524 78,080
Gross investment gains from sales and maturities 1,136,902 7,480
Gross investment losses from sales and maturities (55,349) (180)
Write-downs recognized in earnings 0 (693)
(Addition to) release of allowance for credit losses (49) (186)
Non-cash related proceeds $ (202,600) $ 6,500