Consolidated Statement of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2013	$ 643,912	$ 174	$ 211,440	$ 462,131	$ (29,833)
Beginning Balance, Shares at Dec. 31, 2013	86,831,000	86,831,000
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under stock option plans, shares		1,146,000
Issuance of common stock under stock option plans	15,651		15,651
Repurchase of common stock, shares		(932,000)
Repurchase of common stock	(35,140)			(35,140)
Stock-based compensation expense	11,258		11,258
Excess tax benefit from stock option exercises	7,178		7,178
Tax benefit for research and development credits as a result of stock option accounting	160		160
Net income	94,854			94,854
Net unrealized loss on cash flow hedges, net of tax of $2	(173)				(173)
Reclassification adjustments for loss (gain) included in net income	101				101
Net unrealized gain on available-for-sale investments, net of tax of $133	1,441				1,441
Reclassification of net realized gain on the sale of available-for-sale investments	(651)				(651)
Foreign currency translation adjustment, net of tax of $501	(4,639)				(4,639)
Ending Balance at Sep. 28, 2014	$ 733,952	$ 174	$ 245,687	$ 521,845	$ (33,754)
Ending Balance, Shares at Sep. 28, 2014	87,045,000	87,045,000