Consolidated Statement of Shareholders' Equity - 9 months ended Oct. 04, 2015 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance, Shares at Dec. 31, 2014	86,542	86,542
Beginning Balance at Dec. 31, 2014	$ 736,437	$ 173	$ 251,717	$ 523,946	$ (39,399)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under stock plans, shares		1,509
Issuance of common stock under stock plans	27,440	$ 3	27,437
Stock repurchased during period, shares		(3,206)
Repurchase of common stock	(126,351)	$ (6)		(126,345)
Stock-based compensation expense	17,070		17,070
Excess tax benefit from stock option exercises	9,937		9,937
Tax benefit for research and development credits as a result of stock options	183		183
Payment of dividends	(12,137)			(12,137)
Net income	168,328			168,328
Net unrealized loss on cash flow hedges, net of tax of $28	(423)				(423)
Reclassification of net realized loss on cash flow hedges	269				269
Net unrealized loss on available-for-sale investments, net of tax of $55	(100)				(100)
Reclassification of net realized gain on the sale of available-for-sale investments	(240)				(240)
Foreign currency translation adjustment, net of tax of $525	$ (7,620)				(7,620)
Ending Balance, Shares at Oct. 04, 2015	84,845	84,845
Ending Balance at Oct. 04, 2015	$ 812,793	$ 170	$ 306,344	$ 553,792	$ (47,513)