Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Operating Activities
Net income	$ 6,378	$ 8,110
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	2,987	3,290
Amortization of other intangible assets and other assets	6,521	4,491
Stock-based compensation expense	10,519	9,277
Income tax benefit (shortfall) from stock-based awards	1,773	45
Excess income tax benefit from stock-based awards	(1,785)	(235)
Deferred income taxes	6,844	6,784
Changes in operating assets and liabilities:
Accounts receivable	6,564	7,452
Inventories	(6,424)	1,083
Prepaid expenses and other assets	8,584	14,266
Accounts payable	447	1,195
Accrued expenses	(5,046)	21,367
Deferred income on shipments to distributors	(1,049)	1,736
Income taxes	(8,409)	(8,324)
Other non-current liabilities	(3,816)	(23,585)
Net cash provided by operating activities	24,088	46,952
Investing Activities
Purchases of available-for-sale investments	(13,037)	(43,366)
Proceeds from sales and maturities of available-for-sale investments	57,739	28,242
Purchases of property and equipment	(1,991)	(1,673)
Purchases of other assets	(935)	(2,113)
Acquisition of business, net of cash acquired	(76,899)
Net cash used in investing activities	(35,123)	(18,910)
Financing Activities
Proceeds from issuance of common stock, net of cash paid for withheld taxes	(2,561)	5,496
Excess income tax benefit from stock-based awards	1,785	235
Repurchases of common stock	(10,138)
Payment of acquisition-related contingent consideration	(4,464)
Payments on debt	(2,583)	(1,250)
Net cash provided by (used in) financing activities	(17,961)	4,481
Increase (decrease) in cash and cash equivalents	(28,996)	32,523
Cash and cash equivalents at beginning of period	141,706	95,800
Cash and cash equivalents at end of period	$ 112,710	$ 128,323