Unaudited Condensed Consolidated Statements Of Operations And Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Deferred income tax benefit (expense) for unrealized gains on investments arising during the period	$ 15	$ (5,476)	$ (81)	$ (3,051)