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Investments (AFS Fixed Income securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less fair value	$ 447,462
Due after one year through five years fair value	2,146,816
Due after five years through 10 years fair value	1,504,185
Due after 10 years fair value	94,355
Total AFS fixed income securities	$ 4,192,818	$ 4,066,122

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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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