Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013
Operating Activities
Net income	$ 27,997	$ 39,177
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	9,512	10,050
Amortization of other intangible assets and other assets	13,090	11,051
Stock-based compensation expense	28,173	22,304
Income tax benefit (shortfall) from stock-based awards	413	(621)
Excess income tax benefit from stock-based awards	(654)	(284)
Deferred income taxes	3,894	6,790
Changes in operating assets and liabilities:
Accounts receivable	769	12,599
Inventories	(1,591)	6,213
Prepaid expenses and other assets	12,627	(1,606)
Accounts payable	5,074	(3,017)
Accrued expenses	6,966	(2,864)
Deferred income on shipments to distributors	6,215	(3,169)
Income taxes	(4,898)	(1,429)
Net cash provided by operating activities	107,587	95,194
Investing Activities
Purchases of available-for-sale investments	(137,373)	(164,317)
Proceeds from sales and maturities of available-for-sale investments	100,009	186,936
Purchases of property and equipment	(5,500)	(8,984)
Purchases of other assets	(3,339)	(3,499)
Acquisitions of businesses, net of cash acquired		(86,441)
Net cash used in investing activities	(46,203)	(76,305)
Financing Activities
Proceeds from issuance of common stock, net of shares withheld for taxes	8,559	11,900
Excess income tax benefit from stock-based awards	654	284
Repurchases of common stock	(50,942)	(7,776)
Payments on debt	(3,750)	(12,184)
Net cash used in financing activities	(45,479)	(7,776)
Increase (decrease) in cash and cash equivalents	15,905	11,113
Cash and cash equivalents at beginning of period	95,800	105,426
Cash and cash equivalents at end of period	$ 111,705	$ 116,539