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Investments (Narrative) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
Securities
Jun. 30, 2015
USD ($)
Dec. 31, 2015
Securities
Investments [Abstract]      
Fixed income securities with call features, percentage 35.00%    
Fixed income securities with call features, currently callable, percentage 0.20%    
Fixed income securities with call features, currently callable, amount $ 77,200    
Fixed income securities with call features, callable during next 12 months, percentage 2.90%    
Fixed income securities with call features, callable during next 12 months, amount $ 1,100,000    
Fixed income securities with call features, not callable until within 6 months of stated maturity, percentage 68.00%    
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations 97.00%   98.00%
Number of individual securities with unrealized losses | Securities 411   1,246
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade 56.00%   84.00%
Investment Holdings [Line Items]      
Scheduled principal repayments, calls and tenders for available for sale securities $ 1,421,976 $ 886,573  
Fixed Maturity Securities [Member]      
Investment Holdings [Line Items]      
Scheduled principal repayments, calls and tenders for available for sale securities 1,200,000 643,800  
Available For Sale Securities [Member]      
Investment Holdings [Line Items]      
Proceeds from sales of available for sale securities $ 186,100 $ 242,800