Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011
Operating Activities
Net income	$ 34,829	$ 11,412
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	6,749	6,680
Amortization of other intangible assets and other assets	4,559	6,077
Stock-based compensation expense	15,865	18,074
Income tax benefit from employee stock-based awards	2,627	2,083
Excess income tax benefit from employee stock-based awards	(2,450)	(1,963)
Deferred income taxes	1,625	181
Changes in operating assets and liabilities:
Accounts receivable	(17,315)	(23,562)
Inventories	(1,299)	2,022
Prepaid expenses and other assets	4,806	(1,021)
Accounts payable	8,766	259
Accrued expenses	(5,203)	(2,841)
Deferred income on shipments to distributors	1,372	5,157
Income taxes	(13,672)	3,672
Net cash provided by operating activities	41,259	26,230
Investing Activities
Purchases of available-for-sale investments	(105,169)	(75,856)
Proceeds from sales and maturities of marketable securities	186,514	104,831
Purchases of property and equipment	(5,095)	(5,058)
Purchases of other assets	(7,919)	(665)
Acquisition of businesses, net of cash acquired		(27,262)
Net cash provided by (used in) investing activities	68,331	(4,010)
Financing Activities
Proceeds from issuance of common stock, net of shares withheld for taxes	2,922	2,489
Excess income tax benefit from employee stock-based awards	2,450	1,963
Repurchases of common stock	(36,173)	(23,241)
Payments on debt		(7,174)
Net cash used in financing activities	(30,801)	(25,963)
Increase (decrease) in cash and cash equivalents	78,789	(3,743)
Cash and cash equivalents at beginning of period	94,964	138,567
Cash and cash equivalents at end of period	$ 173,753	$ 134,824