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RESTRUCTURING AND FACILITIES CONSOLIDATION INTIATIVES - Narrative (Details) $ in Thousands	1 Months Ended	8 Months Ended	12 Months Ended
	Jul. 31, 2016 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2019 USD ($) employee	Dec. 31, 2018 USD ($) employee	Dec. 31, 2017 USD ($) employee	Oct. 27, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 16,399	$ 17,015	$ 9,436
Accelerated amortization of lease assets due to cease-use			3,692
Long-term portions of accrued restructuring			900	500
2019 Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring and related expense, including accelerated depreciation			11,200
Restructuring expense			7,475
Accelerated amortization of lease assets due to cease-use			3,700
Accelerated rent amortization			3,700
2019 Restructuring Initiative | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 6,103
Number of positions eliminated | employee			120
2019 Restructuring Initiative | Variable And other facilities costs
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 1,400
2019 Restructuring Initiative | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring expense			1,372
Merger Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 5,232	$ 16,134
Number of positions eliminated | employee			40	275	120
Merger Restructuring | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 5,076	$ 14,735	$ 8,500
Merger Restructuring | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring expense			156	1,399
GENBAND Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 600
Restructuring liability assumed						$ 4,100
GENBAND Restructuring | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring liability assumed						3,700
GENBAND Restructuring | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring liability assumed						$ 400
2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 2,000				500
2016 Restructuring | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring expense	1,900				400
2016 Restructuring | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 100				100
Taqua Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 1,800			700
Taqua Restructuring Initiative | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring expense		1,200			200
Taqua Restructuring Initiative | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 600			500
Restructuring estimate | GENBAND Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expense				$ 900	$ 300

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