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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Available For Sale Securities Debt Maturities Amortized Cost    
Due in one year or less $ 900,166  
Due after one year through five years 7,939,821  
Due after five year through ten years 9,533,025  
Due after ten years 12,740,424  
Asset and mortgage-backed securities 4,800,269  
Total 35,913,705 $ 35,281,412
Available For Sale Securities Debt Maturities Fair Value    
Due in one year or less 905,385  
Due after one year through five years 8,084,053  
Due after five year through ten years 9,779,934  
Due after ten years 14,372,085  
Asset and mortgage-backed securities 4,803,803  
Total $ 37,945,260 $ 38,150,820