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Investments Investments (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
position
Dec. 31, 2014
USD ($)
position
Dec. 31, 2013
USD ($)
Investment Narrative [Line Items]      
Available-for-sale Securities, Amortized Cost Basis $ 17,575,507 $ 14,010,604  
Available-for-sale Securities $ 17,708,156 $ 14,885,583  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | position 2,080 932  
Proceeds From Sale Of Available For Sale Securities Sold At Loss $ 1,523,600 $ 1,016,500 $ 1,104,000
Available-for-sale Securities, Gross Realized Losses 71,893 31,295 $ 60,575
Securities Sold under Agreements to Repurchase 0 92,446  
Securities for Reverse Repurchase Agreements $ 443,435 $ 298,466  
Mortgage Loan Percent Of Invested Assets 7.50% 7.40%  
Policy Loans Percent Of Invested Assets 3.50% 3.50%  
Funds Withheld At Interest Percent Of Invested Assets 14.00% 16.10%  
Percentage Of Total Gross Unrealized Losses 100.00% 100.00%  
Funds withheld at interest $ 5,880,203 $ 5,922,561  
Funds Held Under Reinsurance Agreements Asset Specific Client $ 4,100,000    
Other Invested Assets Percent Of Invested Assets 3.10% 3.30%  
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 100.00% 100.00%  
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 101,400    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0 $ 107,158  
Non-Income Producing Securities [Member]      
Investment Narrative [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 116,000 42,700  
Available-for-sale Securities 123,000 52,800  
Canadian Province Of Quebec Securities [Member]      
Investment Narrative [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 943,484 1,006,315  
Available-for-sale Securities 1,525,903 1,599,673  
Reported Value Measurement [Member]      
Investment Narrative [Line Items]      
Securities Borrowed 259,540 201,050  
Funds withheld at interest [1] 5,956,380 5,897,202  
Mortgage Receivable [Member]      
Investment Narrative [Line Items]      
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due $ 0 $ 0  
CALIFORNIA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 22.30% 18.70%  
[1] Carrying values presented herein differ from those presented in the consolidated balance sheets because certain items within the respective financial statement caption are embedded derivatives and are measured at fair value on a recurring basis.