Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Operating Activities
Net income	$ 8,110	$ 20,034
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	3,290	3,297
Amortization of other intangible assets and other assets	4,491	2,840
Stock-based compensation expense	9,277	6,260
Income tax benefit (shortfall) from stock-based awards	45	(363)
Excess income tax benefit from stock-based awards	(235)	(217)
Deferred income taxes	6,784	7,521
Changes in operating assets and liabilities:
Accounts receivable	7,452	5,256
Inventories	1,083	(7,350)
Prepaid expenses and other assets	14,266	4,620
Accounts payable	1,195	2,356
Accrued expenses	(2,218)	(4,330)
Deferred income on shipments to distributors	1,736	(598)
Income taxes	(8,324)	(9,818)
Net cash provided by operating activities	46,952	29,508
Investing Activities
Purchases of available-for-sale investments	(43,366)	(78,851)
Proceeds from sales and maturities of available-for-sale investments	28,242	25,674
Purchases of property and equipment	(1,673)	(3,898)
Purchases of other assets	(2,113)	(1,228)
Net cash used in investing activities	(18,910)	(58,303)
Financing Activities
Proceeds from issuance of common stock, net of shares withheld for taxes	5,496	4,915
Excess income tax benefit from stock-based awards	235	217
Payments on debt	(1,250)	(2,500)
Net cash provided by financing activities	4,481	2,632
Increase (decrease) in cash and cash equivalents	32,523	(26,163)
Cash and cash equivalents at beginning of period	95,800	105,426
Cash and cash equivalents at end of period	$ 128,323	$ 79,263