CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 04, 2015	Sep. 28, 2014	Oct. 04, 2015	Sep. 28, 2014
Foreign currency translation adjustments, tax	$ 0		$ 0
Unrealized gains (losses) on marketable securities arising during period, tax	48	$ (139)	(896)	$ 1,103
Reclassification adjustment for gains included in net income, tax	(126)	(348)	(335)	(591)
Amortization of prior service (benefit) costs, tax	$ (42)	$ (42)	$ (127)	$ (127)