Consolidated Statement of Shareholders' Equity - 3 months ended Apr. 03, 2016 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance, Shares at Dec. 31, 2015	84,856,000	84,856,000
Beginning Balance at Dec. 31, 2015	$ 825,667	$ 170	$ 311,008	$ 566,613	$ (52,124)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under stock plans, shares		196,000
Issuance of common stock under stock plans	3,440		3,440
Stock-based compensation expense	6,804		6,804
Payment of dividends	(5,950)			(5,950)
Net income	14,885			14,885
Net unrealized gain (loss) on cash flow hedges, net of tax of $82	(585)				(585)
Reclassification of net realized loss on cash flow hedges	4				4
Net unrealized gain (loss) on available-for-sale investments, net of tax of $267	1,281				1,281
Reclassification of net realized (gain) loss on the sale of available-for-sale investments	13				13
Foreign currency translation adjustment, net of tax of $329	$ 5,160				5,160
Ending Balance, Shares at Apr. 03, 2016	85,052,000	85,052,000
Ending Balance at Apr. 03, 2016	$ 850,719	$ 170	$ 321,252	$ 575,548	$ (46,251)