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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Available For Sale Securities Debt Maturities Amortized Cost    
Due in one year or less $ 649,473  
Due after one year through five years 4,976,774  
Due after five year through ten years 7,762,616  
Due after ten years 8,724,169  
Asset and mortgage-backed securities 3,731,763  
Total 25,844,795 $ 23,105,597
Available For Sale Securities Debt Maturities Fair Value    
Due in one year or less 657,750  
Due after one year through five years 5,182,233  
Due after five year through ten years 7,980,594  
Due after ten years 9,754,428  
Asset and mortgage-backed securities 3,836,783  
Total $ 27,411,788 $ 25,480,972