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Investments (Narrative) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
securities
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
securities
Dec. 31, 2015
USD ($)
Investment Narrative [Line Items]        
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash $ 30,500   $ 28,800  
Derivative Instruments, Gain Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing 1,000 $ 4,600    
Net Amount Assets Liabilities From Repurchase Reverse Repurchase Agreements 2,500   5,500  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held $ 3,677 7,284 $ 6,013 $ 7,284
Policy Loans Percent Of Total Investments 3.10%   3.20%  
Mortgage Loan Percent Of Cash And Invested Assets 8.50%   8.40%  
Proceeds From Sale Of Available For Sale Securities Sold At Loss $ 576,200 242,600    
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments 12,563 11,787    
Available-for-sale Securities, Gross Realized Gains $ 17,893 $ 27,192    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 1,308   1,535  
Securities As Percentage Of Consolidated Stockholder Equity 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%  
Funds Withheld At Interest Percent Of Total Investments 13.10%   13.10%  
Funds withheld at interest $ 5,943,450   $ 5,875,919  
Funds Held Under Reinsurance Agreements Asset Specific Client $ 4,100,000      
Other Invested Assets Percent Of Cash And Invested Assets 3.10%   3.60%  
CALIFORNIA        
Investment Narrative [Line Items]        
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 23.50%   22.10%