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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 978,683
Due after one year through five years	7,550,595
Due after five year through ten years	9,208,763
Due after ten years	12,697,898
Asset and mortgage-backed securities	4,798,031
Total	35,233,970	$ 30,211,787
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	986,160
Due after one year through five years	7,649,023
Due after five year through ten years	9,323,786
Due after ten years	14,053,438
Asset and mortgage-backed securities	4,772,547
Total	$ 36,784,954	$ 38,150,820

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