Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Net income	$ 29,940	$ 26,990	$ 79,907	$ 65,126
Other comprehensive income (loss):
Pension liability adjustments (net of tax of $39 and $49, for the three months ended 2014 and 2013, and $178 and $233 for the nine months ended 2014 and 2013, respectively)	4	(24)	(1)	(349)
Unrealized (loss) gain on investments	(1,773)	(532)	1,811	546
Foreign currency translation adjustments	(14,962)	10,273	(15,273)	(2,998)
Comprehensive income	$ 13,209	$ 36,707	$ 66,444	$ 62,325