Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Unrealized gains (losses) on investments arising during the period, deferred tax	$ 19,404	$ 3,790	$ 19,037	$ 8,237
Reclassification adjustment for net realized (gains) losses included in net income, deferred tax	870	865	2,390	719
Non credit other-than-temporary impairments arising during the period, deferred tax	13	53	163	263
Reclassification adjustment for non-credit other-than-temporary impairment losses recognized in net income, deferred tax				15
Change in foreign currency translation gains (losses), deferred tax	$ 566	$ 452	$ 975	$ 1,851