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Investments (Rollforward of Allowance for Credit Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning balance $ 64,771 $ 0 [1]
Additions for credit losses not previously recorded 1,112 94,560
Change in allowance on securities with previous allowance (482)  
Reduction for securities with credit losses due to intent to sell (209) (22,436)
Reduction for securities sold during the period (50,758) (7,353)
Write-offs charged against the allowance (10,032)  
Recoveries of amounts previously written off (1,556)  
Ending balance 2,846 64,771
United States Municipalities, States and Territories    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning balance 2,844 0 [1]
Additions for credit losses not previously recorded 0 2,844
Change in allowance on securities with previous allowance (68)  
Reduction for securities with credit losses due to intent to sell   0
Reduction for securities sold during the period 0 0
Write-offs charged against the allowance 0  
Recoveries of amounts previously written off 0  
Ending balance 2,776 2,844
Corporate Securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning balance 60,193 0 [1]
Additions for credit losses not previously recorded 705 60,193
Change in allowance on securities with previous allowance 443  
Reduction for securities with credit losses due to intent to sell (209) 0
Reduction for securities sold during the period (50,758) 0
Write-offs charged against the allowance (10,032)  
Recoveries of amounts previously written off (342)  
Ending balance 0 60,193
Commercial Mortgage Backed Securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning balance 0 0 [1]
Additions for credit losses not previously recorded 0 29,241
Change in allowance on securities with previous allowance 0  
Reduction for securities with credit losses due to intent to sell 0 (21,888)
Reduction for securities sold during the period 0 (7,353)
Write-offs charged against the allowance 0  
Recoveries of amounts previously written off 0  
Ending balance 0 0
Residential Mortgage Backed Securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning balance 1,734 0 [1]
Additions for credit losses not previously recorded 407 1,734
Change in allowance on securities with previous allowance (857)  
Reduction for securities with credit losses due to intent to sell 0 0
Reduction for securities sold during the period 0 0
Write-offs charged against the allowance 0  
Recoveries of amounts previously written off (1,214)  
Ending balance 70 1,734
Other Asset Backed Securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Beginning balance 0 0 [1]
Additions for credit losses not previously recorded 0 548
Change in allowance on securities with previous allowance 0  
Reduction for securities with credit losses due to intent to sell 0 (548)
Reduction for securities sold during the period 0 0
Write-offs charged against the allowance 0  
Recoveries of amounts previously written off 0  
Ending balance $ 0 $ 0
[1] The allowance for credit loss associated with available for sale fixed maturity securities was applied prospectively upon adoption of authoritative guidance effective January 1, 2020. See Note 1 - Significant Accounting Policies for further details.