Condensed Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ (2,146)	$ 92
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	(79)	211
Unrealized gains (losses) on available-for-sale securities:
Unrealized gains (losses) for the period	33	(6)
Reclassification adjustment for losses included in net income (loss)	23
Total unrealized gains (losses) on available-for-sale securities	56	(6)
Unrealized gains (losses) on foreign exchange forward contracts:
Unrealized gains (losses) for the period	(139)	323
Reclassification adjustment for (gains) losses included in net income (loss)	(33)	75
Total unrealized gains (losses) on foreign exchange forward contracts	(172)	398
Other comprehensive income (loss), before tax	(195)	603
Income tax provision related to items of other comprehensive income (loss)		136
Other comprehensive income (loss), net of tax	(195)	467
Total comprehensive income (loss)	$ (2,341)	$ 559