Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Operating Activities
Net income	$ 15,426	$ 5,808
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	3,596	3,310
Amortization of other intangible assets and other assets	6,752	7,980
Amortization of debt discount and debt issuance costs	869
Stock-based compensation expense	10,486	10,344
Income tax benefit (shortfall) from stock-based awards		(1,025)
Excess income tax benefit from stock-based awards		(6)
Deferred income taxes	(4,059)	(38)
Changes in operating assets and liabilities:
Accounts receivable	(1,252)	(990)
Inventories	(1,636)	4,580
Prepaid expenses and other assets	6,708	9,159
Accounts payable	5,565	1,559
Accrued expenses	(3,889)	6,260
Deferred income on shipments to distributors	4,038	5,558
Income taxes	945	494
Other non-current liabilities	(1,536)	(10,584)
Net cash provided by operating activities	42,013	42,409
Investing Activities
Purchases of available-for-sale investments	(267,777)	(44,547)
Sales and maturities of available-for-sale investments	25,595	46,654
Purchases of property and equipment	(4,543)	(2,303)
Purchases of other assets	(1,446)	(1,107)
Acquisition of business, net of cash acquired	(13,658)
Net cash used in investing activities	(261,829)	(1,303)
Financing Activities
Proceeds from issuance of long-term debt, net	390,000
Payments on debt	(72,500)	(2,500)
Repurchases of common stock		(18,484)
Payment of taxes withheld for vested stock awards	(13,553)	(7,517)
Proceeds from the issuance of common stock	162
Net cash provided by (used in) financing activities	304,109	(28,501)
Increase in cash and cash equivalents	84,293	12,605
Cash and cash equivalents at beginning of period	141,106	114,085
Cash and cash equivalents at end of period	$ 225,399	$ 126,690