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Investments (Rollforward of Allowance for Credit Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Beginning balance $ 14,190 $ 50,186 $ 64,771 $ 0
Additions for credit losses not previously recorded 296 25,923 1,112 82,335
Change in allowance on securities with previous allowance (260)   537  
Reduction for securities sold during the period 0   (50,758)  
Write-offs charged against the allowance (10,032)   (10,032)  
Recoveries of amounts previously written off (120)   (1,556)  
Reduction for securities with credit losses due to intent to sell   (14,490)   (20,716)
Ending balance 4,074 61,619 4,074 61,619
United States Municipalities, States and Territories        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Beginning balance 3,347 0 2,844 0
Additions for credit losses not previously recorded 0 0 0 0
Change in allowance on securities with previous allowance (575)   (72)  
Reduction for securities sold during the period 0   0  
Write-offs charged against the allowance 0   0  
Recoveries of amounts previously written off 0   0  
Reduction for securities with credit losses due to intent to sell   0   0
Ending balance 2,772 0 2,772 0
Corporate Securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Beginning balance 10,723 46,749 60,193 0
Additions for credit losses not previously recorded 0 6,296 705 53,045
Change in allowance on securities with previous allowance 315   1,240  
Reduction for securities sold during the period 0   (50,758)  
Write-offs charged against the allowance (10,032)   (10,032)  
Recoveries of amounts previously written off 0   (342)  
Reduction for securities with credit losses due to intent to sell   0   0
Ending balance 1,006 53,045 1,006 53,045
Commercial Mortgage Backed Securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Beginning balance 0 2,660 0 0
Additions for credit losses not previously recorded 0 19,183 0 27,521
Change in allowance on securities with previous allowance 0   0  
Reduction for securities sold during the period 0   0  
Write-offs charged against the allowance 0   0  
Recoveries of amounts previously written off 0   0  
Reduction for securities with credit losses due to intent to sell   (14,490)   (20,168)
Ending balance 0 7,353 0 7,353
Residential Mortgage Backed Securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Beginning balance 120 777 1,734 0
Additions for credit losses not previously recorded 296 444 407 1,221
Change in allowance on securities with previous allowance 0   (631)  
Reduction for securities sold during the period 0   0  
Write-offs charged against the allowance 0   0  
Recoveries of amounts previously written off (120)   (1,214)  
Reduction for securities with credit losses due to intent to sell   0   0
Ending balance 296 1,221 296 1,221
Other Asset Backed Securities        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Beginning balance 0 0 0 0
Additions for credit losses not previously recorded 0 0 0 548
Change in allowance on securities with previous allowance 0   0  
Reduction for securities sold during the period 0   0  
Write-offs charged against the allowance 0   0  
Recoveries of amounts previously written off 0   0  
Reduction for securities with credit losses due to intent to sell   0   (548)
Ending balance $ 0 $ 0 $ 0 $ 0