Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016
Operating Activities
Net Income	$ 51,944	$ 41,385
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	11,068	9,912
Amortization of other intangible assets and other assets	20,531	21,461
Amortization of debt discount and debt issuance costs	6,984
Stock-based compensation expense	33,007	30,057
Income tax shortfall from stock-based awards		(1,611)
Deferred income taxes	(5,703)	(1,460)
Changes in operating assets and liabilities:
Accounts receivable	(1,587)	(11,322)
Inventories	(13,196)	(1,558)
Prepaid expenses and other assets	23,506	7,404
Accounts payable	1,746	1,280
Accrued expenses	9,720	8,930
Deferred income on shipments to distributors	11,039	11,573
Income taxes	(424)	1,459
Other non-current liabilities	(7,269)	(10,891)
Net cash provided by operating activities	141,366	106,619
Investing Activities
Purchases of available-for-sale investments	(471,938)	(131,741)
Sales and maturities of available-for-sale investments	143,765	129,511
Purchases of property and equipment	(10,494)	(8,545)
Purchases of other assets	(2,622)	(4,994)
Acquisition of business, net of cash acquired	(13,658)
Net cash used in investing activities	(354,947)	(15,769)
Financing Activities
Proceeds from issuance of long-term debt, net	389,468
Payments on debt	(72,500)	(5,000)
Repurchases of common stock		(40,543)
Payment of taxes withheld for vested stock awards	(14,870)	(10,148)
Proceeds from the issuance of common stock	6,836	8,451
Payment of acquisition-related contingent consideration		(9,500)
Net cash provided by (used in) financing activities	308,934	(56,740)
Increase in cash and cash equivalents	95,353	34,110
Cash and cash equivalents at beginning of period	141,106	114,085
Cash and cash equivalents at end of period	$ 236,459	$ 148,195