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Investments Investments (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
position
Dec. 31, 2017
USD ($)
position
Dec. 31, 2016
USD ($)
Investment Narrative [Line Items]      
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash $ 28,600 $ 31,200  
Net Amount Assets Liabilities From Repurchase Reverse Repurchase Agreements 400 1,100  
Available-for-sale Securities, Amortized Cost Basis 24,006,407 21,966,803  
Available-for-sale Securities $ 23,982,119 $ 23,210,968  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | position 3,109 1,116  
Proceeds From Sale Of Available For Sale Securities Sold At Loss $ 5,784,600 $ 2,550,100 $ 1,055,500
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments 158,870 37,328 47,094
ProceedsFromSaleOfAvailableForSaleEquitySecuritiesSoldAtLoss 32,800 177,700 126,100
Securities for Reverse Repurchase Agreements $ 554,806 $ 413,819  
Mortgage Loan Percent Of Invested Assets 9.10% 8.50%  
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due $ 0 $ 19,156  
Policy Loans Percent Of Invested Assets 2.50% 2.60%  
Funds Withheld At Interest Percent Of Invested Assets 10.60% 11.80%  
Percentage Of Total Gross Unrealized Losses 100.00% 100.00%  
Funds withheld at interest $ 5,761,471 $ 6,083,388  
Funds Held Under Reinsurance Agreements Asset Specific Client $ 3,800,000    
Other Invested Assets Percent Of Invested Assets 3.50% 2.90%  
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 100.00% 100.00%  
Collateral Obtained Percent Of Fair Value Reverse Repurchase Agreements 100.00%    
Available-for-sale Equity Securities, Gross Unrealized Loss $ 1,937 $ 4,351 $ 2,871
Non-Income Producing Securities [Member]      
Investment Narrative [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 41,300 38,800  
Available-for-sale Securities 42,700 39,300  
Canadian Province Of Quebec Securities [Member]      
Investment Narrative [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 913,642 939,837  
Available-for-sale Securities 1,187,526 1,282,944  
Collateral Received Fixed Maturity Securities [Member]      
Investment Narrative [Line Items]      
Available-for-sale Securities 616,584 590,417  
Reported Value Measurement [Member]      
Investment Narrative [Line Items]      
Securities Borrowed 335,781 358,875  
Funds withheld at interest [1] $ 5,655,055 $ 5,955,092  
CALIFORNIA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 18.70%    
TEXAS      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 10.90%    
GEORGIA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 7.40%    
CANADA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 2.70%    
UNITED KINGDOM      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 0.10%    
[1] Carrying values presented herein may differ from those in the Company’s consolidated balance sheets because certain items within the respective financial statement captions may be measured at fair value on a recurring basis.