Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Operating Activities
Net income	$ 22,389	$ 32,646
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	6,427	6,634
Amortization of other intangible assets and other assets	8,839	5,635
Stock-based compensation expense	18,559	13,684
Income tax benefit (shortfall) from stock-based awards	377	(489)
Excess income tax benefit from stock-based awards	(589)	(243)
Deferred income taxes	4,665	9,277
Changes in operating assets and liabilities:
Accounts receivable	3,082	9,388
Inventories	(123)	(1,028)
Prepaid expenses and other assets	3,394	5,023
Accounts payable	3,846	(2,271)
Accrued expenses	(4,902)	(6,013)
Deferred income on shipments to distributors	2,584	293
Income taxes	(5,130)	(6,439)
Net cash provided by operating activities	63,418	66,097
Investing Activities
Purchases of available-for-sale investments	(117,744)	(121,994)
Proceeds from sales and maturities of available-for-sale investments	61,803	146,870
Purchases of property and equipment	(3,339)	(6,498)
Purchases of other assets	(2,726)	(2,438)
Net cash provided by (used in) investing activities	(62,006)	15,940
Financing Activities
Proceeds from issuance of common stock, net of shares withheld for taxes	8,943	9,512
Excess income tax benefit from stock-based awards	589	243
Repurchases of common stock	(10,954)
Payments on debt	(2,500)	(3,750)
Net cash provided by (used in) financing activities	(3,922)	6,005
Increase (decrease) in cash and cash equivalents	(2,510)	88,042
Cash and cash equivalents at beginning of period	95,800	105,426
Cash and cash equivalents at end of period	$ 93,290	$ 193,468