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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Schedule of Investments [Line Items]      
Loans acquired $ 0 $ 0  
Loans Sold 0 5,000  
Fixed Maturity Purchased with Credit Deterioration 0    
Accrued Investment Income Write Down 0    
Securities sold under agreements to repurchase $ 0   $ 0
Commercial mortgage loans, Percentage 100.00%   100.00%
Loans on non-accrual status recognized in interest income $ 0    
Commercial Mortgage and other loans purchased with Credit Deterioration 0    
Fixed maturities      
Schedule of Investments [Line Items]      
Gross Unrealized Losses 175,616   $ 23,843
Gross unrealized losses of twelve months or more concentrated in various sectors 51,737   20,712
NAIC high or highest quality rating | Fixed maturities      
Schedule of Investments [Line Items]      
Gross Unrealized Losses 138,400   16,000
NAIC other than high or highest quality rating | Fixed maturities      
Schedule of Investments [Line Items]      
Gross Unrealized Losses $ 37,200   7,800
California      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 20.00%    
Texas      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 14.00%    
New York      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 8.00%    
Europe      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 9.00%    
Mexico      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 3.00%    
Australia      
Schedule of Investments [Line Items]      
Commercial mortgage loans, Percentage 2.00%    
Other Income | Equity securities      
Schedule of Investments [Line Items]      
Unrealized Gain (Loss) on Investments $ (800) $ 700  
Fixed maturities      
Schedule of Investments [Line Items]      
Gross unrealized losses of twelve months or more concentrated in various sectors $ 51,700   $ 20,700