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Investments Investments (AFS Fixed Maturity Securities by Contractual Maturity) (Tables) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less fair value	$ 374,080
Due after one year through five years fair value	2,141,596
Due after five years through 10 years fair value	2,090,677
Due after 10 years fair value	186,187
Available-for-sale Securities, Debt Securities	$ 4,792,540	$ 4,408,203

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- Definition

Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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