Consolidated Condensed Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Oct. 02, 2011	Oct. 03, 2010
Cash flows from operating activities:
Net income	$ 50,770	$ 41,617
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	5,829	1,672
Depreciation of property, plant and equipment	4,082	3,441
Amortization of intangible assets	3,181	3,788
Amortization of premiums/discounts on investments	4,675	1,972
Tax effect of stock option exercises	(3,624)	(81)
Change in deferred income taxes	(359)	(2,397)
Change in operating assets and liabilities	(2,184)	(3,264)
Net cash provided by operating activities	62,370	46,748
Cash flows from investing activities:
Purchases of investments	(288,045)	(178,080)
Maturities and sale of investments	217,495	58,676
Purchases of property, plant, and equipment	(5,545)	(3,307)
Cash received related to disposition		315
Net cash used in investing activities	(76,095)	(122,396)
Cash flows from financing activities:
Issuance of common stock under stock option plans	27,837	7,324
Stock option buyback		(83)
Repurchase of common stock	(10,000)
Payment of dividends	(10,897)	(6,747)
Tax effect of stock option exercises	3,624	81
Net cash provided by financing activities	10,564	575
Effect of foreign exchange rate changes on cash	133	(6,545)
Net decrease in cash and cash equivalents	(3,028)	(81,618)
Cash and cash equivalents at beginning of period	33,203	119,831
Cash and cash equivalents at end of period	$ 30,175	$ 38,213