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Investments (Rollforward of Allowance for Credit Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ 6,187 $ 14,190 $ 2,846 $ 64,771
Additions for credit losses not previously recorded 439 296 4,895 1,112
Change in allowance on securities with previous allowance (1,706) (260) (2,393) 537
Reduction for securities sold during the period 0 0 (428) (50,758)
Write-offs charged against the allowance 0 (10,032) 0 (10,032)
Recoveries of amounts previously written off 0 (120) 0 (1,556)
Ending balance 4,920 4,074 4,920 4,074
States, Municipalities and Territories        
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Beginning balance 1,834 3,347 2,776 2,844
Additions for credit losses not previously recorded 0 0 0 0
Change in allowance on securities with previous allowance (1,834) (575) (2,776) (72)
Reduction for securities sold during the period 0 0 0 0
Write-offs charged against the allowance 0 0 0 0
Recoveries of amounts previously written off 0 0 0 0
Ending balance 0 2,772 0 2,772
Corporate Securities        
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Beginning balance 3,743 10,723 0 60,193
Additions for credit losses not previously recorded 0 0 3,825 705
Change in allowance on securities with previous allowance (529) 315 (611) 1,240
Reduction for securities sold during the period 0   0 (50,758)
Write-offs charged against the allowance 0 (10,032) 0 (10,032)
Recoveries of amounts previously written off 0 0 0 (342)
Ending balance 3,214 1,006 3,214 1,006
Residential Mortgage Backed Securities        
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Beginning balance 610 120 70 1,734
Additions for credit losses not previously recorded 439 296 1,070 407
Change in allowance on securities with previous allowance 657 0 994 (631)
Reduction for securities sold during the period 0   (428) 0
Write-offs charged against the allowance 0 0 0 0
Recoveries of amounts previously written off 0 (120) 0 (1,214)
Ending balance $ 1,706 $ 296 $ 1,706 $ 296