Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ 36,588	$ 31,919	$ (28,175)
Unrealized net gains (losses) on securities:
Unrealized holding net gains (losses) arising during the period	23,711	10,148	(4,645)
Less: reclassification adjustment for net gains included in net income (loss)	(10,089)	(1,273)	(2,657)
Change in unrealized gains (losses) on investments	13,622	8,875	(7,302)
Foreign currency translation adjustments	(575)	217	(230)
Other comprehensive income (loss)	13,047	9,092	(7,532)
Comprehensive income (loss)	$ 49,635	$ 41,011	$ (35,707)