Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010
Cash flows from operating activities:
Net income including noncontrolling interests	$ 35,063	$ 40,080
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:
Depreciation and amortization	3,840	3,151
Share-based compensation	7,574	6,318
Provision for doubtful accounts	92	154
Provision for obsolete inventory	850	359
Provision for warranty costs	1,334	1,150
Provision for deferred income taxes		133
Income tax benefit from exercise of stock options granted prior to January 1, 2006	1,058	1,631
Excess tax benefit from share-based payment arrangements	(89)	(537)
Changes in operating assets and liabilities:
Increase in accounts receivable	(2,433)	(10,338)
Decrease in royalties receivable	4,748
Increase in inventories	(776)	(5,910)
Increase in deferred cost of goods sold	(5,135)	(4,499)
(Increase) decrease in prepaid expenses	(2,043)	1,243
Increase in other assets	(101)	(1,963)
Increase (decrease) in accounts payable	(2,045)	5,084
Decrease in accrued compensation	(6,257)	(1,752)
Decrease in accrued liabilities	(831)	(1,291)
Increase in income taxes payable	676	1,073
Increase (decrease) in deferred revenue	(1,394)	2,703
Increase in other liabilities	654	1,064
Net cash provided by operating activities	34,785	37,853
Cash flows from investing activities:
Purchase of short-term investments		(75,986)
Proceeds from sale and maturities of short-term investments		132,975
Purchases of property and equipment	(2,123)	(3,930)
Increase in intangible assets	(848)	(911)
Net cash provided by (used in) investing activities	(2,971)	52,148
Cash flows from financing activities:
Repayments of capital lease obligations	(27)	(28)
Proceeds from issuance of common stock	5,127	5,662
Excess tax benefit from share-based payment arrangements	89	537
Dividends paid		(117,506)
Net cash provided by (used in) financing activities	5,189	(111,335)
Effect of foreign currency exchange rates on cash	386	251
Net increase (decrease) in cash and cash equivalents	37,389	(21,083)
Cash and cash equivalents at beginning of period	88,305	132,054
Cash and cash equivalents at end of period	$ 125,694	$ 110,971