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Investments (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Investment [Line Items]          
Securities sold under agreements to repurchase $ 0   $ 0   $ 0
Commercial mortgage loans, Percentage 100.00%   100.00%   100.00%
Commercial mortgage and other loans, Acquired $ 0 $ 0 $ 0 $ 0  
Commercial mortgage and other loans, Sold 0 0 5,000,000 0  
Fixed maturities          
Investment [Line Items]          
Gross Unrealized Losses 37,412,000   37,412,000   $ 142,065,000
Gross unrealized losses of twelve months or more concentrated in various sectors 31,585,000   31,585,000   60,301,000
NAIC high or highest quality rating | Fixed maturities          
Investment [Line Items]          
Gross Unrealized Losses 24,600,000   24,600,000   121,300,000
NAIC other than high or highest quality rating | Fixed maturities          
Investment [Line Items]          
Gross Unrealized Losses $ 12,800,000   $ 12,800,000   20,800,000
California          
Investment [Line Items]          
Commercial mortgage loans, Percentage 19.00%   19.00%    
Texas          
Investment [Line Items]          
Commercial mortgage loans, Percentage 14.00%   14.00%    
New York          
Investment [Line Items]          
Commercial mortgage loans, Percentage 7.00%   7.00%    
Europe          
Investment [Line Items]          
Commercial mortgage loans, Percentage 6.00%   6.00%    
Australia          
Investment [Line Items]          
Commercial mortgage loans, Percentage 4.00%   4.00%    
Mexico          
Investment [Line Items]          
Commercial mortgage loans, Percentage 2.00%   2.00%    
Other Income | Equity securities          
Investment [Line Items]          
Unrealized Gain (Loss) on Investments $ 300,000 $ (200,000) $ 500,000 $ (2,100,000)  
Fixed maturities          
Investment [Line Items]          
Gross unrealized losses of twelve months or more concentrated in various sectors $ 31,600,000   $ 31,600,000   $ 60,300,000