Consolidated Statement of Shareholders' Equity and Comprehensive Income (USD $) In Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Gain (Loss)	Comprehensive Income
Beginning Balance at Dec. 31, 2010	$ 473,311	$ 82	$ 102,620	$ 379,826	$ (9,217)
Beginning Balance, Shares at Dec. 31, 2010	41,065	41,065
Issuance of common stock under stock option plans	20,819	2	20,817
Issuance of common stock under stock option plans, Shares	(1,004)	1,000
Stock-based compensation expense	4,309		4,309
Excess tax benefit from stock option exercises	2,425		2,425
Payment of dividends	(7,096)			(7,096)
Comprehensive income:
Net income	32,733			32,733		32,733
Net unrealized loss on available-for-sale investments, net of tax of $35	(177)				(177)	(177)
Foreign currency translation adjustment, net of tax of $469	13,961				13,961	13,961
Comprehensive income						46,517
Ending Balance (unaudited) at Jul. 03, 2011	$ 540,285	$ 84	$ 130,171	$ 405,463	$ 4,567
Ending Balance, Shares (unaudited) at Jul. 03, 2011	42,065	42,065