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Investments (Narrative) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Securities
Sep. 30, 2015
USD ($)
Dec. 31, 2015
Securities
Investments [Abstract]      
Fixed income securities with call features, percentage 36.00%    
Fixed income securities with call features, currently callable, percentage 0.10%    
Fixed income securities with call features, currently callable, amount $ 46,600    
Fixed income securities with call features, callable during next 12 months, percentage 3.40%    
Fixed income securities with call features, callable during next 12 months, amount $ 1,300,000    
Fixed income securities with call features, not callable until within 6 months of stated maturity, percentage 69.00%    
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations 97.00%   98.00%
Number of individual securities with unrealized losses | Securities 364   1,246
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade 53.00%   84.00%
Investment Holdings [Line Items]      
Scheduled principal repayments, calls and tenders for available for sale securities $ 1,853,281 $ 1,280,927  
Fixed Maturity Securities [Member]      
Investment Holdings [Line Items]      
Scheduled principal repayments, calls and tenders for available for sale securities 1,500,000 1,000,000  
Available For Sale Securities [Member]      
Investment Holdings [Line Items]      
Proceeds from sales of available for sale securities $ 364,000 $ 269,700