Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015
Operating Activities
Net income	$ 41,385	$ 23,928
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	9,912	9,293
Amortization of other intangible assets and other assets	21,461	21,686
Stock-based compensation expense	30,057	30,798
Income tax benefit (shortfall) from stock-based awards	(1,238)	1,727
Excess income tax benefit from stock-based awards	(373)	(2,118)
Deferred income taxes	(1,460)	1,571
Changes in operating assets and liabilities:
Accounts receivable	(11,322)	12,097
Inventories	(1,558)	2,259
Prepaid expenses and other assets	7,404	8,409
Accounts payable	1,280	(5,686)
Accrued expenses	8,930	(280)
Deferred income on shipments to distributors	11,573	(2,825)
Income taxes	1,459	(3,413)
Other non-current liabilities	(10,891)	(10,031)
Net cash provided by operating activities	106,619	87,415
Investing Activities
Purchases of available-for-sale investments	(131,741)	(55,433)
Sales and maturities of available-for-sale investments	129,511	136,262
Purchases of property and equipment	(8,545)	(7,281)
Purchases of other assets	(4,994)	(5,291)
Acquisition of business, net of cash acquired		(76,899)
Net cash used in investing activities	(15,769)	(8,642)
Financing Activities
Proceeds from issuance of long-term debt, net		81,238
Payments on debt	(5,000)	(92,206)
Repurchases of common stock	(40,543)	(71,448)
Payment of taxes withheld for vested stock awards	(10,521)	(12,652)
Proceeds from the issuance of common stock	8,451	12,575
Excess income tax benefit from stock-based awards	373	2,118
Payment of acquisition-related contingent consideration	(9,500)	(4,464)
Net cash used in financing activities	(56,740)	(84,839)
Increase (decrease) in cash and cash equivalents	34,110	(6,066)
Cash and cash equivalents at beginning of period	114,085	141,706
Cash and cash equivalents at end of period	$ 148,195	$ 135,640