Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Unrealized gains (losses) on investments arising during the period, tax	$ 7,010	$ 617
Reclassification adjustment for net realized (gains) losses included in net income, tax	366	1,770
Non credit other-than-temporary impairments arising during the period, tax	31	150
Change in foreign currency translation gains (losses), tax	$ 3,584	$ 1,543