SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Segment Reporting, Revenue Reconciling Item [Line Items]
Product Revenues	$ 123,026	$ 129,488	$ 242,964	$ 266,234
Revenues From Divestitures or Exited Product Lines	(2,848)	0	(2,848)	0	91,000
Services revenues	34,405	32,295	66,607	61,301
Total net revenues	157,431	161,783	309,571	327,535
Revenues	157,431	161,783	309,571	327,535
Video Products [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Product Revenues	67,865	64,486	121,287	130,996
Audio Products [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Product Revenues	58,009	65,002	124,525	135,238
Services Revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Services revenues	34,405	32,295	66,607	61,301
Revenues from United States [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	59,552	71,004	120,122	137,043
Revenues	59,552	71,004	120,122	137,043
Revenues from other countries [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	97,879	90,779	189,449	190,492
Revenues	97,879	90,779	189,449	190,492
Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	73,342	85,311	146,832	164,530
Revenues	73,342	85,311	146,832	164,530
Europe, Middle East and Africa [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	61,769	55,120	117,290	119,680
Revenues	61,769	55,120	117,290	119,680
Asia-Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	22,320	21,352	45,449	43,325
Revenues	$ 22,320	$ 21,352	$ 45,449	$ 43,325