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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Available For Sale Securities Debt Maturities Amortized Cost    
Due in one year or less $ 837,801  
Due after one year through five years 6,853,278  
Due after five year through ten years 9,113,078  
Due after ten years 9,803,968  
Asset and mortgage-backed securities 3,932,442  
Total 30,540,567 $ 30,211,787
Available For Sale Securities Debt Maturities Fair Value    
Due in one year or less 849,530  
Due after one year through five years 7,132,145  
Due after five year through ten years 9,548,835  
Due after ten years 11,190,478  
Asset and mortgage-backed securities 3,973,805  
Total $ 32,694,793 $ 32,093,625