SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Product Revenues	$ 90,878	$ 131,655	$ 333,841	$ 397,889
Revenues From Divestitures or Exited Product Lines	1,807	0	(1,041)	0	93,500
Services revenues	36,297	33,043	102,905	94,343
Total net revenues	127,175	164,698	436,746	492,232
Revenues	127,175	164,698	436,746	492,232
Video Products [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Product Revenues	47,089	67,653	167,002	198,632
Audio Products [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Product Revenues	41,982	64,002	167,880	199,257
Services Revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Services revenues	36,297	33,043	102,905	94,343
Revenues from United States [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	53,203	68,675	181,492	206,414
Revenues	53,203	68,675	181,492	206,414
Revenues from other countries [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	73,972	96,023	255,254	285,818
Revenues	73,972	96,023	255,254	285,818
Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	62,272	86,396	211,802	250,924
Revenues	62,272	86,396	211,802	250,924
Europe, Middle East and Africa [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	47,502	56,114	162,093	175,793
Revenues	47,502	56,114	162,093	175,793
Asia-Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	17,401	22,188	62,851	65,515
Revenues	$ 17,401	$ 22,188	$ 62,851	$ 65,515