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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Investment [Line Items]      
Securities Sold under Agreements to Repurchase $ 0   $ 0
Commercial mortgage loans, Percentage 100.00%   100.00%
Commercial mortgage and other loans, Acquired $ 0 $ 0  
Commercial mortgage and other loans, Sold 101,000 0  
Fixed maturities      
Investment [Line Items]      
Gross unrealized losses 283,803   $ 501,591
Gross unrealized losses of twelve months or more concentrated in various sectors 271,515   432,255
NAIC high or highest quality rating | Fixed maturities      
Investment [Line Items]      
Gross unrealized losses 276,800   485,700
NAIC other than high or highest quality rating | Fixed maturities      
Investment [Line Items]      
Gross unrealized losses $ 7,000   15,900
California      
Investment [Line Items]      
Commercial mortgage loans, Percentage 27.00%    
Texas      
Investment [Line Items]      
Commercial mortgage loans, Percentage 13.00%    
New York      
Investment [Line Items]      
Commercial mortgage loans, Percentage 7.00%    
Europe      
Investment [Line Items]      
Commercial mortgage loans, Percentage 12.00%    
Australia      
Investment [Line Items]      
Commercial mortgage loans, Percentage 3.00%    
Other Income | Equity Securities      
Investment [Line Items]      
Unrealized Gain (Loss) on Investments $ 900 $ 800  
Fixed maturities      
Investment [Line Items]      
Gross unrealized losses of twelve months or more concentrated in various sectors $ 271,500   $ 432,300