SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended			36 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Product Revenues									$ 546,371	$ 559,907	$ 509,215
Services revenues									131,565	118,615	119,755
Total net revenues	185,304	164,965	161,344	166,323	195,347	165,059	162,160	155,956	677,936	678,522	628,970
Revenues	185,304	164,965	161,344	166,323	195,347	165,059	162,160	155,956	677,936	678,522	628,970
Long-lived assets	61,059				69,597				61,059	69,597		61,059
Minimum percentage of revenue not attained by any individual country other than the country of domicile (in hundredths)												10.00%
Video Editing Products [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Percentage accounted for of Company's consolidated net revenues (in hundredths)									11.00%	13.00%	13.00%
Video Storage and Workflow Solutions [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Percentage accounted for of Company's consolidated net revenues (in hundredths)									21.00%	18.00%	16.00%
Digital Audio Software and Workstation Solutions [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Percentage accounted for of Company's consolidated net revenues (in hundredths)									14.00%	16.00%	15.00%
Video Products [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Product Revenues									278,979	282,263	259,151
Audio Products [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Product Revenues									267,392	277,644	250,064
Services Revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Services revenues									131,565	118,615	119,755
Revenues from United States [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									277,615	283,854	252,474
Revenues									277,615	283,854	252,474
Revenues from other countries [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									400,321	394,668	376,496
Revenues									400,321	394,668	376,496
Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									330,378	334,849	300,073
Revenues									330,378	334,849	300,073
Europe, Middle East and Africa [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									257,215	248,507	251,148
Revenues									257,215	248,507	251,148
Asia-Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									90,343	95,166	77,749
Revenues									90,343	95,166	77,749
United States [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Long-lived assets	48,433				59,587				48,433	59,587		48,433
Other Countries [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Long-lived assets	$ 12,626				$ 10,010				$ 12,626	$ 10,010		$ 12,626