Consolidated Statement of Shareholders' Equity - 6 months ended Jul. 05, 2015 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance, Shares at Dec. 31, 2014	86,542,000	86,542,000
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 option plans, shares		1,280,000
Issuance of common stock under stock plans	$ 21,457	$ 2	21,455
Stock repurchased during period, shares	(720,000)	(720,000)
Repurchase of common stock	$ (35,848)	$ (1)		(35,847)
Stock-based compensation expense	11,577		11,577
Excess tax benefit from stock option exercises	9,358		9,358
Tax benefit for research and development credits as a result of stock options	48		48
Payment of dividends	(6,110)			(6,110)
Net income	64,216			64,216
Net unrealized loss on cash flow hedges, net of tax of $25	(283)				(283)
Reclassification of net realized loss into current operations	179				179
Net unrealized gain on available-for-sale investments, net of tax of $6	566				566
Reclassification of net realized gain on the sale of available-for-sale investments	(221)				(221)
Foreign currency translation adjustment, net of tax of $529	$ (8,240)				(8,240)
Ending Balance, Shares at Jul. 05, 2015	87,102	87,102,000
Ending Balance at Jul. 05, 2015	$ 793,136	$ 174	$ 294,155	$ 546,205	$ (47,398)