Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income (loss)	$ (15,741)	$ 4,452
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization of intangibles	22,004	22,767
Depreciation	11,337	10,306
Stock-based compensation	14,122	16,099
Net loss (gain) on disposal of fixed assets	(57)	450
Deferred income taxes	1,627	(2,218)
Provision for inventories	2,466	2,757
Allowance for doubtful accounts, returns and discounts	216	2,646
Other non-cash adjustments, net	617	564
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable	15,036	(17,429)
Inventories	(85)	(9,914)
Prepaid expenses and other assets	1,847	7,176
Accounts payable	364	5,117
Deferred revenue	3,307	(9,610)
Income taxes payable	(1,482)	(5,927)
Accrued and other liabilities	(5,352)	(6,847)
Net cash provided by operating activities	50,226	20,389
Cash flows from investing activities:
Purchases of investments	(94,123)	(76,164)
Proceeds from maturities of investments	44,876	15,522
Proceeds from sales of investments	30,486	18,248
Acquisition of property and equipment	(9,850)	(12,373)
Other acquisitions		(250)
Net cash used in investing activities	(28,611)	(55,017)
Cash flows from financing activities:
Payments for repurchase of common stock	(14,388)
Proceeds from issuance of common stock, net	4,922	13,301
Net cash provided by (used in) financing activities	(9,466)	13,301
Effect of exchange rate changes on cash and cash equivalents	103	29
Net increase (decrease) in cash and cash equivalents	12,252	(21,298)
Cash and cash equivalents at beginning of period	90,983	96,533
Cash and cash equivalents at end of period	$ 103,235	$ 75,235