Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015
Operating Activities
Net income	$ 21,367	$ 13,953
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	6,675	6,029
Amortization of other intangible assets and other assets	15,534	14,697
Stock-based compensation expense	20,861	21,576
Income tax benefit (shortfall) from stock-based awards	(1,127)	2,781
Excess income tax benefit from stock-based awards	(91)	(2,056)
Deferred income taxes	817	3,892
Changes in operating assets and liabilities:
Accounts receivable	1,611	1,724
Inventories	(2,888)	(6,534)
Prepaid expenses and other assets	3,282	452
Accounts payable	(1,680)	(3,359)
Accrued expenses	4,372	(1,027)
Deferred income on shipments to distributors	3,773	(2,132)
Income taxes	(1,338)	(7,171)
Other non-current liabilities	(10,737)	(5,622)
Net cash provided by operating activities	60,431	37,203
Investing Activities
Purchases of available-for-sale investments	(92,222)	(46,908)
Sales and maturities of available-for-sale investments	78,950	92,759
Purchases of property and equipment	(5,146)	(4,714)
Purchases of other assets	(2,215)	(1,871)
Acquisition of business, net of cash acquired		(76,899)
Net cash used in investing activities	(20,633)	(37,633)
Financing Activities
Payments on debt	(5,000)	(5,083)
Repurchases of common stock	(36,103)	(10,418)
Payment of taxes withheld for vested stock awards	(9,399)	(10,783)
Proceeds from the issuance of common stock	7,362	12,467
Excess income tax benefit from stock-based awards	91	2,056
Payment of acquisition-related contingent consideration	(9,500)	(4,464)
Net cash used in financing activities	(52,549)	(16,225)
Decrease in cash and cash equivalents	(12,751)	(16,655)
Cash and cash equivalents at beginning of period	114,085	141,706
Cash and cash equivalents at end of period	$ 101,334	$ 125,051