Consolidated Condensed Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010
Cash flows from operating activities:
Net income	$ 32,733	$ 23,472
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	4,309	394
Depreciation of property, plant and equipment	2,669	2,282
Amortization of intangible assets	2,130	2,462
Amortization of premium/discounts on investments	2,996	1,091
Tax effect of stock option exercises	(2,425)	76
Change in deferred income taxes	(642)	(789)
Change in operating assets and liabilities	6,309	(7,711)
Net cash provided by operating activities	48,079	21,277
Cash flows from investing activities:
Purchase of investments	(168,165)	(116,600)
Maturities and sale of investments	114,803	35,486
Purchases of property, plant, and equipment	(3,625)	(2,231)
Cash received related to disposition		315
Net cash used in investing activities	(56,987)	(83,030)
Cash flows from financing activities:
Issuance of common stock under stock option plans	20,819	395
Stock option buyback		(83)
Payment of dividends	(7,096)	(4,365)
Tax effect of stock option exercises	2,425	(76)
Net cash provided by (used in) financing activities	16,148	(4,129)
Effect of foreign exchange rate changes on cash	2,233	(16,007)
Net increase (decrease) in cash and cash equivalents	9,473	(81,889)
Cash and cash equivalents at beginning of period	33,203	119,831
Cash and cash equivalents at end of period	$ 42,676	$ 37,942