Condensed Consolidated Statements of Comprehensive Income (Loss) Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudted) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (4,554)	$ 1,903	$ (14,702)	$ 8,112
Other comprehensive income (loss):
Change in foreign currency translation adjustment	1,142	1,108	(837)	190
Net change on unrealized gains (losses) on available-for-sale investments	20	1	17	(3)
Other comprehensive loss	1,162	1,109	(820)	187
Comprehensive income (loss)	$ (3,392)	$ 3,012	$ (15,522)	$ 8,299