Condensed Consolidated Statements of Comprehensive Income (Loss) (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
Statement of Comprehensive Income [Abstract]
Net income	$ 23,263	$ 9,429	$ 56,333	$ 88,038
Other comprehensive income (loss), net of tax effects:
Foreign currency translation adjustments	2,377	(11,705)	6,828	(17,867)
Changes in unrealized holding gains or losses on available-for-sale securities, net of reclassification adjustment for realized gains and losses	775	(99)	595	(383)
Changes in defined benefit plan liabilities	(21)	65	387	383
Total other comprehensive income (loss), net of tax effects	3,131	(11,739)	7,810	(17,867)
Comprehensive income (loss)	$ 26,394	$ (2,310)	$ 64,143	$ 70,171