Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ (3,584)	$ (2,825)	$ (41,629)	$ 13,458
Other comprehensive income:
Foreign currency translation adjustments	(119)	(576)	(192)	52
Unrealized loss on investments, net of tax	(36)	(4)	(10)	(11)
Total other comprehensive income (loss), net of tax	(155)	(580)	(202)	41
Total comprehensive income (loss), net of tax	$ (3,739)	$ (3,405)	$ (41,831)	$ 13,499