Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income, Net of Tax, Beginning Balance	$ 118,651
Other comprehensive income	56,363	(176,620)	67,612
Accumulated Other Comprehensive Income, Net of Tax, Ending Balance	175,014	118,651
Accumulated Net Unrealized Investment Gain [Member]
Accumulated Other Comprehensive Income, Net of Tax, Beginning Balance	99,960	282,503	213,114
Other comprehensive income	70,024	(182,543)	69,389
Accumulated Other Comprehensive Income, Net of Tax, Ending Balance	169,984	99,960	282,503
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income, Net of Tax, Beginning Balance	18,691	12,768	14,545
Other comprehensive income	(13,661)	5,923	(1,777)
Accumulated Other Comprehensive Income, Net of Tax, Ending Balance	5,030	18,691	12,768
Accumulated other comprehensive income [Member]
Other comprehensive income	$ 56,363	$ (176,620)	$ 67,612

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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