Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Net income	$ 24,578	$ 26,648	$ 49,967	$ 38,136
Other comprehensive income (loss):
Pension liability adjustments (net of tax of $67 and $69, for the three months ended 2014 and 2013, and $160 and $172 for the six months ended 2014 and 2013, respectively)	39	(131)	(5)	(325)
Unrealized gain (loss) on investments	2,276	(540)	3,584	1,078
Foreign currency translation adjustments	6,850	(8,021)	(311)	(13,271)
Comprehensive income	$ 33,743	$ 17,956	$ 53,235	$ 25,618