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Investments (Narrative) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
securities
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
securities
Dec. 31, 2016
USD ($)
Investment Narrative [Line Items]        
Proceeds From Sale Of Available For Sale Securities Sold At Loss $ 1,263,600 $ 428,600    
Sales of fixed maturity securities available-for-sale 1,898,722 1,563,956    
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash 30,700   $ 31,200  
Derivative Instruments, Gain Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing 2,400 1,000    
Net Amount Assets Liabilities From Repurchase Reverse Repurchase Agreements 400   1,100  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held $ 3,677 3,677 $ 3,677 $ 6,013
Policy Loans Percent Of Total Investments 2.60%   2.60%  
Mortgage Loan Percent Of Cash And Invested Assets 8.60%   8.50%  
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments $ 20,380 8,687    
Proceeds From Sale Of Available For Sale Equity Securities Sold At Loss 28,400 147,600    
Available-for-sale Equity Securities, Gross Unrealized Loss 950 3,876    
Available-for-sale Securities, Gross Realized Gains $ 10,966 17,893    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | securities 2,114   1,116  
Securities As Percentage Of Consolidated Stockholder Equity 10.00%      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 100.00%   100.00%  
Funds Withheld At Interest Percent Of Total Investments 11.70%   11.80%  
Funds withheld at interest $ 6,005,892   $ 6,083,388  
Funds Held Under Reinsurance Agreements Asset Specific Client $ 4,000,000      
Other Invested Assets Percent Of Cash And Invested Assets 2.90%   2.90%  
Gain (Loss) on Sale of Equity Investments $ (4,137) $ 0    
CALIFORNIA        
Investment Narrative [Line Items]        
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 19.60%      
TEXAS        
Investment Narrative [Line Items]        
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 8.60%      
GEORGIA        
Investment Narrative [Line Items]        
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 7.50%      
CANADA        
Investment Narrative [Line Items]        
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 2.40%