Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 103,235	$ 90,983
Short-term investments	88,747	70,854
Accounts receivable, net	94,638	109,886
Inventories	68,269	70,649
Deferred income taxes	29,897	28,032
Prepaid expenses and other current assets	19,178	21,474
Total current assets	403,964	391,878
Property and equipment, net	39,121	40,469
Goodwill	212,523	212,417
Intangibles, net	65,647	87,651
Other assets	2,245	1,751
Total assets	723,500	734,166
Current liabilities:
Accounts payable	30,915	30,537
Income taxes payable	1,122	2,290
Deferred revenue	34,660	33,095
Accrued liabilities	39,922	46,896
Total current liabilities	106,619	112,818
Income taxes payable, long-term	46,972	47,307
Deferred income taxes, long-term	4,148	655
Other non-current liabilities	12,453	9,070
Total liabilities	170,192	169,850
Commitments and contingencies (Note 13)
Stockholders' equity:
Preferred stock, $0.001 par value, 5,000 shares authorized; no shares issued or outstanding
Common stock, $0.001 par value, 150,000 shares authorized; 115,732 and 116,257 shares issued and outstanding at September 28, 2012 and December 31, 2011, respectively	116	116
Capital in excess of par value	2,437,539	2,433,164
Accumulated deficit	(1,883,830)	(1,868,089)
Accumulated other comprehensive loss	(517)	(875)
Total stockholders' equity	553,308	564,316
Total liabilities and stockholders' equity	$ 723,500	$ 734,166