CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012
Cash flows from operating activities:
Net income (loss)	$ 2,621	$ (7,511)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization of intangibles	13,805	14,777
Depreciation	8,140	7,519
Stock-based compensation	8,008	9,502
Gain on sale of discontinued operations, net of tax	(14,819)
Loss on impairment of fixed assets	149
Deferred income taxes	(9,307)	1,330
Provision for inventories	2,143	1,735
Allowance for doubtful accounts, returns and discounts	1,062	2,275
Excess tax benefits from stock-based compensation		(75)
Other non-cash adjustments, net	777	398
Changes in assets and liabilities:
Accounts receivable	(1,390)	4,867
Inventories	7,167	907
Prepaid expenses and other assets	3,541	(3,184)
Accounts payable	(2,929)	(684)
Deferred revenue	3,937	4,448
Income taxes payable	(877)	(2,560)
Accrued and other liabilities	(2,946)	(5,605)
Net cash provided by operating activities	19,082	28,139
Cash flows from investing activities:
Purchases of investments	(39,117)	(57,661)
Proceeds from maturities of investments	36,838	26,110
Proceeds from sales of investments	27,506	16,483
Purchases of property and equipment	(8,755)	(6,708)
Proceeds from sale of discontinued operations, net of selling costs	43,638
Net cash provided by (used in) investing activities	60,110	(21,776)
Cash flows from financing activities:
Payments for repurchase of common stock	(95,372)	(6,953)
Proceeds from issuance of common stock, net	2,818	2,016
Excess tax benefits from stock-based compensation		75
Net cash used in financing activities	(92,554)	(4,862)
Effect of exchange rate changes on cash and cash equivalents	(105)	(38)
Net (decrease) increase in cash and cash equivalents	(13,467)	1,463
Cash and cash equivalents at beginning of period	96,670	90,983
Cash and cash equivalents at end of period	$ 83,203	$ 92,446