Condensed Consolidated Statements Of Comprehensive Income (Loss) (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)	$ (447)	$ 1,566	$ (212)	$ 3,810
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	212	(271)	344	(28)
Unrealized gains (losses) on available-for-sale securities:
Unrealized gains (losses) on available-for-sale securities for the period	(72)	(27)	(73)	25
Reclassification adjustment for (gains) included in net income (loss)	(2)		(6)
Total unrealized gains (losses) on available-for-sale securities	(74)	(27)	(79)	25
Unrealized gains (losses) on foreign exchange forward contracts:
Unrealized gains (losses) on foreign exchange forward contracts for the period	290	(747)	544	(557)
Reclassification adjustment for (gains) losses included in net income (loss)		(57)	170	(96)
Total unrealized gains (losses) on foreign exchange forward contracts	290	(804)	714	(653)
Other comprehensive income (loss), before tax	428	(1,102)	979	(656)
Income tax provision (benefit) related to items of other comprehensive income (loss)	93	(282)	235	(213)
Other comprehensive income (loss), net of tax	335	(820)	744	(443)
Total comprehensive income (loss)	$ (112)	$ 746	$ 532	$ 3,367