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Investments (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
securities
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
securities
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
securities
Investment Narrative [Line Items]          
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash $ 38,500   $ 38,500   $ 28,800
Net Amount Assets Liabilities From Repurchase Reverse Repurchase Agreements 7,900   7,900   $ 5,500
Proceeds From Sale Of Available For Sale Securities Sold At Loss 484,700 $ 317,300 1,771,400 $ 903,100  
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments $ 7,678 $ 9,054 $ 30,712 $ 43,397  
Policy Loans Percent Of Total Investments 2.70%   2.70%   3.20%
Mortgage Loan Percent Of Cash And Invested Assets 8.70%   8.70%   8.40%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 1,165   1,165   1,535
Securities As Percentage Of Consolidated Stockholder Equity 10.00%   10.00%    
Securities Borrowed Or Pledged, Minimum Fair Value Percentage     100.00%    
Collateral Obtained Percent Of Fair Value Reverse Repurchase Agreements     100.00%    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 100.00%   100.00%   100.00%
Funds Withheld At Interest Percent Of Total Investments 12.10%   12.10%   13.10%
Funds withheld at interest $ 6,020,336   $ 6,020,336   $ 5,875,919
Funds Held Under Reinsurance Agreements Asset Specific Client $ 4,000,000   $ 4,000,000    
Other Invested Assets Percent Of Cash And Invested Assets 3.10%   3.10%   3.60%
CALIFORNIA          
Investment Narrative [Line Items]          
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 21.20%   21.20%   22.10%