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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Schedule of Investments [Line Items]          
Loans Acquired $ 167,000 $ 0 $ 167,000 $ 0  
Loans Sold 0 0 0 0  
Commercial mortgage and others loans Purchased with Credit Deterioration     0   $ 0
Accrued Investment Income Write Down 0 0 0 0  
Repurchase Agreements 0   0   0
Securities Lending $ 0   $ 0   $ 0
Commercial mortgage loans, Percentage 100.00%   100.00%   100.00%
Fixed maturities purchased with credit deterioration     $ 0   $ 0
Fixed maturities          
Schedule of Investments [Line Items]          
Gross Unrealized Losses $ 34,950   34,950   23,882
Gross unrealized losses of twelve months or more concentrated in various sectors 248   248   6,072
NAIC high or highest quality rating | Fixed maturities          
Schedule of Investments [Line Items]          
Gross Unrealized Losses 31,100   31,100   17,400
NAIC other than high or highest quality rating | Fixed maturities          
Schedule of Investments [Line Items]          
Gross Unrealized Losses $ 3,800   $ 3,800   6,500
California          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 27.00%   27.00%    
Texas          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 13.00%   13.00%    
New York          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 10.00%   10.00%    
Europe          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 13.00%   13.00%    
Australia          
Schedule of Investments [Line Items]          
Commercial mortgage loans, Percentage 3.00%   3.00%    
Other Income | Fixed maturities          
Schedule of Investments [Line Items]          
Unrealized Gain (Loss) on Investments $ 252,200 10,500 $ (300,100) 61,600  
Other Income | Equity Securities          
Schedule of Investments [Line Items]          
Unrealized Gain (Loss) on Investments 6,700 $ 3,300 (9,000) $ 1,700  
Fixed maturities          
Schedule of Investments [Line Items]          
Gross unrealized losses of twelve months or more concentrated in various sectors $ 200   $ 200   $ 6,100