Condensed Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Net income (loss)	$ 2,465	$ (9,508)
Other comprehensive income (loss)
Changes in foreign currency translation adjustments	(616)	(459)
Changes in unrealized investment loss	0	(29)
Other comprehensive income (loss)	(616)	(488)
Comprehensive income (loss)	$ 1,849	$ (9,996)