Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unrealized gains (losses) on investments arising during the period, deferred tax	$ 14,925	$ 17,521	$ 13,136
Reclassification adjustment for net realized (gains) losses included in net income, deferred tax	2,776	6,218	10,314
Non credit other-than-temporary impairments arising during the period, deferred tax	48	174	612
Reclassification adjustment for non credit other-than-temporary impairment losses recognized in net income, deferred tax	0	0	16
Change in foreign currency translation gains (losses), deferred tax	$ 2,800	$ 1,650	$ 521