ACQUISITIONS (Narrative) (Details) (USD $)	12 Months Ended	0 Months Ended			12 Months Ended	0 Months Ended
	Dec. 31, 2014	Oct. 16, 2014	Sep. 19, 2014	Dec. 03, 2013	Dec. 31, 2013	Sep. 04, 2013	Aug. 01, 2013
Business Acquisition [Line Items]
Net revenues	$ 6,800,000
Net loss from continuing operations	100,000
Central Desktop
Business Acquisition [Line Items]
Acquisition related costs	400,000
Earn-out liability		2,900,000
Intangible assets	9,200,000
Negotiated sales price		25,076,000
Preliminary working capital and other adjustments		(76,000)
TalkPoint
Business Acquisition [Line Items]
Acquisition related costs	400,000
Indemnification asset			1,100,000
Uncertain tax position			1,100,000
Earn-out liability			6,400,000
Intangible assets	28,400,000
Negotiated sales price			55,583,000
Preliminary working capital and other adjustments			917,000
Powwownow
Business Acquisition [Line Items]
Acquisition related costs					400,000
Indemnification asset				8,200,000
Uncertain tax position				8,000,000
Interest payable				200,000
Earn-out liability	1,900,000			3,800,000
Contingent Consideration, Liability, change in amount	1,900,000
Intangible assets					35,568,000
Adjustment to deferred tax liabilities				6,000,000
Negotiated sales price				52,499,000
Preliminary working capital and other adjustments				684,000
ACT
Business Acquisition [Line Items]
Acquisition related costs	1,400,000
Indemnification asset						3,700,000
Indemnification asset, Prepaid expenses and other current assets						1,100,000
Indemnification asset, Other assets						2,600,000
Uncertain tax position						3,400,000
Interest payable						300,000
Intangible assets					31,000,000
Adjustment to deferred tax liabilities, Total						10,900,000
Adjustment to deferred tax liabilities						5,500,000
Negotiated sales price						51,485,000
Preliminary working capital and other adjustments						1,515,000
Copper
Business Acquisition [Line Items]
Acquisition related costs	400,000
Negotiated sales price							10,300,000
Preliminary working capital and other adjustments							200,000
Developed technology | Central Desktop
Business Acquisition [Line Items]
Amortization period (in years)	7 years
Intangible assets, preliminary valuation		6,000,000
Developed technology | TalkPoint
Business Acquisition [Line Items]
Amortization period (in years)	7 years
Intangible assets, preliminary valuation			16,000,000
Customer relationships | Central Desktop
Business Acquisition [Line Items]
Amortization period (in years)	10 years
Intangible assets, preliminary valuation		1,100,000
Customer relationships | TalkPoint
Business Acquisition [Line Items]
Amortization period (in years)	10 years
Intangible assets, preliminary valuation			9,500,000
Customer relationships | Powwownow
Business Acquisition [Line Items]
Amortization period (in years)	10 years
Intangible assets, preliminary valuation				29,000,000
Customer relationships | ACT
Business Acquisition [Line Items]
Amortization period (in years)	10 years
Intangible assets, preliminary valuation						30,200,000
Customer relationships | Copper
Business Acquisition [Line Items]
Intangible assets, preliminary valuation							6,400,000
Non-compete agreements | Central Desktop
Business Acquisition [Line Items]
Amortization period (in years)	5 years
Intangible assets, preliminary valuation		1,800,000
Non-compete agreements | TalkPoint
Business Acquisition [Line Items]
Amortization period (in years)	5 years
Intangible assets, preliminary valuation			2,200,000
Non-compete agreements | Powwownow
Business Acquisition [Line Items]
Amortization period (in years)	3 years
Intangible assets, preliminary valuation				2,100,000
Non-compete agreements | ACT
Business Acquisition [Line Items]
Amortization period (in years)	5 years
Intangible assets, preliminary valuation						800,000
Trade names | Central Desktop
Business Acquisition [Line Items]
Amortization period (in years)	2 years
Intangible assets, preliminary valuation		300,000
Trade names | TalkPoint
Business Acquisition [Line Items]
Amortization period (in years)	2 years
Intangible assets, preliminary valuation			700,000
Trade names | Powwownow
Business Acquisition [Line Items]
Amortization period (in years)	10 years
Intangible assets, preliminary valuation				4,400,000
Goodwill | Copper
Business Acquisition [Line Items]
Intangible assets, preliminary valuation							3,300,000
Adjustments / reclassifications | ACT
Business Acquisition [Line Items]
Intangible assets						1,300,000
Domestic | ACT
Business Acquisition [Line Items]
Uncertain tax position						$ 200,000