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Investments (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
securities
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
securities
Jun. 30, 2015
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
securities
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Investment Narrative [Line Items]                
Proceeds From Sale Of Available For Sale Securities Sold At Loss $ 343,300 $ 651,300 $ 585,800 $ 850,900        
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments 22,556 14,475 34,343 28,071        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held 6,974 7,284 6,974 7,284 $ 7,284 $ 7,284 $ 7,284 $ 7,284
Financing Receivable, Recorded Investment, Past Due $ 0   $ 0     $ 0    
Policy Loans Percent Of Total Investments 3.20%   3.20%     3.50%    
Mortgage Loan To Value Ratio on Approval     75.00%          
Mortgage Loan Percent Of Cash And Invested Assets 7.40%   7.40%     7.50%    
Available-for-sale Securities, Gross Realized Gains $ 53,615 $ 20,009 $ 80,807 $ 39,210        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 908   908     2,080    
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 12.90%   12.90%     14.00%    
Funds withheld at interest $ 5,899,289   $ 5,899,289     $ 5,880,203    
Funds Held Under Reinsurance Agreements Asset Specific Client $ 4,000,000   $ 4,000,000          
Other Invested Assets Percent Of Cash And Invested Assets 3.70%   3.70%     3.10%    
CALIFORNIA                
Investment Narrative [Line Items]                
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 24.10%   24.10%     22.30%