Unaudited Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 43,785	$ 70,460
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,745	12,125
Purchase premium amortization on investments	878	2,018
Non-cash stock-based compensation	12,492	10,806
Income tax benefit associated with stock option exercises	483	926
Excess tax benefit from stock-based compensation	(665)	(1,374)
Gain on Sale of Investments	0	(3,126)
Impairment charges	2,000	0
Deferred income taxes	(4,381)	(1,602)
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable	(13,951)	12,469
Inventories	(33,499)	(14,603)
Prepaid expenses and other assets	(8,795)	74
Accounts payable	40,993	(26,855)
Accrued employee compensation	(1,153)	(6,005)
Other accrued liabilities	8,721	(2,126)
Deferred revenue	404	(12,120)
Income taxes payable	1,737	(3,507)
Net cash provided by operating activities	72,794	37,560
Cash flows from investing activities:
Purchases of short-term investments	(128,322)	(308,787)
Proceeds from sales and maturities of short-term investments	214,341	223,733
Purchase of property and equipment	(11,709)	(11,492)
Payments for patents	(275)	0
Payments from sale of cost method investment	3,890	0
Payments made in connection with business acquisitions	(147,215)	(28,625)
Net cash used in investing activities	(69,290)	(125,171)
Cash flows from financing activities:
Purchase and retirement of treasury stock	(486)	(815)
Proceeds from exercise of stock options	5,630	10,757
Proceeds from issuance of common stock under employee stock purchase plan	2,139	1,998
Excess tax benefit from stock-based compensation	665	1,374
Net cash provided by financing activities	7,948	13,314
Net increase (decrease) in cash and cash equivalents	11,452	(74,297)
Cash and cash equivalents, at beginning of period	149,032	208,898
Cash and cash equivalents, at end of period	$ 160,484	$ 134,601