Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014
Operating Activities
Net income	$ 13,953	$ 22,389
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	6,029	6,427
Amortization of other intangible assets and other assets	14,697	8,839
Stock-based compensation expense	21,576	18,559
Income tax benefit from stock-based awards	2,781	377
Excess income tax benefit from stock-based awards	(2,056)	(589)
Deferred income taxes	3,892	4,665
Changes in operating assets and liabilities:
Accounts receivable	1,724	3,082
Inventories	(6,534)	(123)
Prepaid expenses and other assets	452	3,394
Accounts payable	(3,359)	3,846
Accrued expenses	(1,027)	19,697
Deferred income on shipments to distributors	(2,132)	2,584
Income taxes	(7,171)	(5,130)
Other non-current liabilities	(5,622)	(24,599)
Net cash provided by operating activities	37,203	63,418
Investing Activities
Purchases of available-for-sale investments	(46,908)	(117,744)
Proceeds from sales and maturities of available-for-sale investments	92,759	61,803
Purchases of property and equipment	(4,714)	(3,339)
Purchases of other assets	(1,871)	(2,726)
Acquisition of business, net of cash acquired	(76,899)
Net cash used in investing activities	(37,633)	(62,006)
Financing Activities
Proceeds from issuance of common stock, net of cash paid for withheld taxes	1,684	8,943
Excess income tax benefit from stock-based awards	2,056	589
Repurchases of common stock	(10,418)	(10,954)
Payment of acquisition-related contingent consideration	(4,464)
Payments on debt	(5,083)	(2,500)
Net cash used in financing activities	(16,225)	(3,922)
Decrease in cash and cash equivalents	(16,655)	(2,510)
Cash and cash equivalents at beginning of period	141,706	95,800
Cash and cash equivalents at end of period	$ 125,051	$ 93,290