CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 28, 2014	Mar. 29, 2013
Cash flows from operating activities:
Net income (loss)	$ (5,410)	$ 6,421
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization of intangibles	6,666	7,033
Depreciation	4,227	4,040
Stock-based compensation	3,807	3,986
Gain on sale of discontinued operations, net of tax	0	(14,956)
Loss on impairment of fixed assets	0	101
Deferred income taxes	3,510	(204)
Provision for excess and obsolete inventories	722	567
Allowance for doubtful accounts, returns and discounts	(536)	1,116
Excess tax benefits from stock-based compensation	(185)	0
Other non-cash adjustments, net	462	408
Changes in assets and liabilities:
Accounts receivable	(1,927)	(10,888)
Inventories	5,900	6,832
Prepaid expenses and other assets	(6,671)	(8,597)
Accounts payable	(2,533)	(2,796)
Deferred revenue	6,382	2,667
Income taxes payable	278	(1,257)
Accrued and other liabilities	(3,447)	(216)
Net cash provided by (used in) operating activities	11,245	(5,743)
Cash flows from investing activities:
Purchases of investments	(14,084)	(25,908)
Proceeds from maturities of investments	15,382	16,249
Proceeds from sales of investments	0	4,000
Purchases of property and equipment	(3,431)	(4,274)
Proceeds from sale of discontinued operations, net of selling costs	0	44,336
Net cash (used in) provided by investing activities	(2,133)	34,403
Cash flows from financing activities:
Payments for repurchase of common stock	(29,075)	(9,268)
Proceeds from (repurchases of) common stock issued to employees	(1,377)	2,508
Excess tax benefits from stock-based compensation	185	0
Net cash used in financing activities	(30,267)	(6,760)
Effect of exchange rate changes on cash and cash equivalents	18	(106)
Net (decrease) increase in cash and cash equivalents	(21,137)	21,794
Cash and cash equivalents at beginning of period	90,329	96,670
Cash and cash equivalents at end of period	$ 69,192	$ 118,464