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Investments (Company's Sale of AFS Investments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sales of AFS debt securities(1) $ 0 $ 207,001 $ 56,155
Gross realized gains 0 1,427 32
Gross realized losses $ 0 (1,532) (695)
OTTI, AFS investments sold   $ 0 $ 0