Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Operating Activities
Net income (loss)	$ 14,320	$ (1,960)
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Depreciation of property and equipment	3,543	3,253
Amortization of other intangible assets and other assets	2,280	3,057
Stock-based compensation expense	6,693	9,473
Income tax benefit from employee stock-based awards	2,656	1,184
Excess income tax benefit from employee stock-based awards	(2,426)	(1,142)
Deferred income taxes	3,101	1,366
Changes in operating assets and liabilities:
Accounts receivable	(6,074)	(11,704)
Inventories	447	(759)
Prepaid expenses and other assets	4,581	(4,499)
Accounts payable	4,209	(4,787)
Accrued expenses	(5,087)	(1,634)
Deferred income on shipments to distributors	3,307	2,293
Income taxes	(5,403)	3,233
Net cash provided by (used in) operating activities	26,147	(2,626)
Investing Activities
Purchases of available-for-sale investments	(82,845)	(31,492)
Proceeds from sales and maturities of marketable securities	60,518	55,092
Purchases of property and equipment	(2,428)	(2,697)
Purchases of other assets	(850)	(584)
Acquisition of business, net of cash acquired		(27,546)
Net cash used in investing activities	(25,605)	(7,227)
Financing Activities
Proceeds from issuance of common stock, net of shares withheld for taxes	106	(3,580)
Excess income tax benefit from employee stock-based awards	2,426	1,142
Repurchases of common stock		(606)
Payments on debt		(7,174)
Net cash provided by (used in) financing activities	2,532	(10,218)
Increase (decrease) in cash and cash equivalents	3,074	(20,071)
Cash and cash equivalents at beginning of period	94,964	138,567
Cash and cash equivalents at end of period	$ 98,038	$ 118,496