GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) (USD $)	12 Months Ended																							12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Completed Technologies and Patents [Member]		Dec. 31, 2010 Completed Technologies and Patents [Member]		Dec. 31, 2011 Customer Relationships [Member]		Dec. 31, 2010 Customer Relationships [Member]		Dec. 31, 2011 Trade Names [Member]		Dec. 31, 2010 Trade Names [Member]		Dec. 31, 2011 License Agreements [Member]		Dec. 31, 2010 License Agreements [Member]		Dec. 31, 2011 Noncompete Covenants [Member]		Dec. 31, 2010 Noncompete Covenants [Member]		Dec. 31, 2011 Blue Order Solutions AG [Member]	Dec. 31, 2010 Blue Order Solutions AG [Member]	Dec. 31, 2011 Euphonix, Inc. [Member]	Dec. 31, 2010 Euphonix, Inc. [Member]	Dec. 31, 2011 Goodwill Impairment Test 2011 [Member]	Sep. 30, 2011 Goodwill Impairment Test 2011 [Member]	Dec. 31, 2010 Goodwill Impairment Test 2010 [Member]
Carrying amount of Goodwill [Abstract]
Goodwill acquired	$ 418,298,000	$ 418,897,000	$ 399,095,000
Accumulated impairment losses	(171,900,000)	(171,900,000)	(171,900,000)
Goodwill	246,398,000	246,997,000	227,195,000
Finite-Lived Intangible Assets [Line Items]
Reporting unit fair value																												506,000,000	530,000,000
Non Compete Agreement Write Off	200,000
Capitalized Computer Software, Gross	6,876,000	7,285,000
Capitalized Computer Software, Accumulated Amortization	(4,730,000)	(5,644,000)
Forecasted Capitalized Computer Software Amortization Year Two	1,000,000
Changes in carrying amount of Goodwill [Roll Forward]
Goodwill balance at beginning of year	246,997,000	227,195,000
Acquisition purchase accounting allocation																								(105,000)	9,816,000	(176,000)	10,525,000
Foreign exchange and other adjustments	(318,000)	(539,000)
Goodwill balance at end of period	246,398,000	246,997,000	227,195,000
Amortizing Identifiable Intangible Assets [Abstract]
Gross	159,541,000	160,058,000		74,624,000	[1]	74,820,000	[1]	68,226,000	[1]	68,330,000	[1]	14,763,000	[1]	14,772,000	[1]	560,000	[1]	560,000	[1]	1,368,000	[1],[2]	1,576,000	[1],[2]
Accumulated Amortization	(141,017,000)	(130,308,000)		(70,536,000)	[1]	(68,026,000)	[1]	(54,396,000)	[1]	(47,344,000)	[1]	(14,577,000)	[1]	(13,737,000)	[1]	(560,000)	[1]	(560,000)	[1]	(948,000)	[1],[2]	(641,000)	[1],[2]
Net	18,524,000	29,750,000		4,088,000	[1]	6,794,000	[1]	13,830,000	[1]	20,986,000	[1]	186,000	[1]	1,035,000	[1]	0	[1]	0	[1]	420,000	[1],[2]	935,000	[1],[2]
Reporting unit carrying value																												417,000,000	414,900,000
Fair value exceeds carrying value step one test percentage																												21.00%	28.00%
Direct market capitalization approach weight																												67.00%	67.00%
Income approach weight																												11.00%	11.00%
Guideline public company market approach weight																												11.00%	11.00%
Guideline transaction market approach weight																												11.00%	11.00%
Direct market capitalization approach control premium																												45.00%	45.00%
Market capitalization stock trading day period																												20	20
Direct market capitalization average stock price																												$ 8.04	$ 8.73
common stock closing price																												$ 8.53	$ 7.74
Fair value exceeds carrying value percentage																												26.00%	20.00%
market capitalization based on closing stock price																												329,300,000	298,300,000
Carrying value control premium																												27.00%	39.00%
Existence of goodwill impairment																												0		0
Capitalized Computer Software, Net	2,146,000	1,641,000
Capitalized software write off	2,100,000
Capitalized software development costs amortized to cost of product revenues	1,200,000	1,000,000	1,400,000
Forecasted Capitalized Computer Software Amortization Year One	1,000,000
Amortization expense [Abstract]
Amortization expense, identifiable intangible assets	11,200,000	13,000,000	12,500,000																					2,600,000	2,400,000	1,600,000	1,100,000
Future expected amortization expense, identifiable intangible assets
2011	7,000,000
2012	5,000,000
2013	3,000,000
2014	2,000,000
2015	$ 2,000,000

[1] The December 31, 2011 net amounts include immaterial foreign currency translation changes from the December 31, 2010 amounts.

[2] During 2011, the Company wrote-off a fully amortized non-compete agreement with a gross value of approximately $0.2 million.