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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 776,005
Due after one year through five years	6,682,598
Due after five year through ten years	8,706,784
Due after ten years	9,866,952
Asset and mortgage-backed securities	4,044,545
Total	30,076,884	$ 28,322,977
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	783,582
Due after one year through five years	7,007,050
Due after five year through ten years	9,309,939
Due after ten years	11,903,257
Asset and mortgage-backed securities	4,157,148
Total	$ 33,160,976	$ 29,642,905

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