CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012
Cash flows from operating activities:
Net income (loss)	$ 39,387	$ (15,741)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization of intangibles	20,569	22,004
Depreciation	12,365	11,337
Stock-based compensation	11,953	14,122
Gain on sale of discontinued operations, net of tax	(14,813)	0
Loss on impairment of fixed assets	149	0
Deferred income taxes	(10,647)	1,627
Provision for inventories	2,813	2,466
Allowance for doubtful accounts, returns and discounts	1,161	2,012
Excess tax benefits from stock-based compensation	0	(80)
Other non-cash adjustments, net	1,220	560
Changes in assets and liabilities:
Accounts receivable	(310)	13,240
Inventories	10,509	(85)
Prepaid expenses and other assets	8,522	1,847
Accounts payable	(5,418)	364
Deferred revenue	5,127	3,307
Income taxes payable	(39,209)	(1,482)
Accrued and other liabilities	(8,244)	(5,352)
Net cash provided by operating activities	35,134	50,146
Cash flows from investing activities:
Purchases of investments	(54,773)	(94,123)
Proceeds from maturities of investments	50,681	44,876
Proceeds from sales of investments	31,506	30,486
Purchases of property and equipment	(11,249)	(9,850)
Proceeds from sale of discontinued operations, net of selling costs	43,527	0
Net cash provided by (used in) investing activities	59,692	(28,611)
Cash flows from financing activities:
Payments for repurchase of common stock	(103,496)	(14,388)
Proceeds from issuance of common stock, net	5,355	4,922
Excess tax benefits from stock-based compensation	0	80
Net cash used in financing activities	(98,141)	(9,386)
Effect of exchange rate changes on cash and cash equivalents	(25)	103
Net (decrease) increase in cash and cash equivalents	(3,340)	12,252
Cash and cash equivalents at beginning of period	96,670	90,983
Cash and cash equivalents at end of period	$ 93,330	$ 103,235