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Investments (Non-Cash OTTI Credit Losses Recognized in Earnings) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Investments [Abstract]    
Balance of credit-related OTTI, Beginning $ 2,244 $ 2,446
Reduction for increases in cash flows expected to be collected (50) (50)
Balance of credit-related OTTI, Ending $ 2,194 $ 2,396