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Investments (Credit Losses Related to Debt Securities) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance for credit loss beginning balance $ 0 $ 0 $ 0 $ 552,000
No allowance for credit losses has been previously recognized 553,000 0 553,000 0
Securities sold during the period 0 0 0 (552,000)
Allowance for credit loss ending balance 553,000 0 553,000 0
Corporate Debt        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance for credit loss beginning balance 0   0 552,000
No allowance for credit losses has been previously recognized 553,000   553,000  
Securities sold during the period       (552,000)
Allowance for credit loss ending balance $ 553,000 $ 0 $ 553,000 $ 0