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RESTRUCTURING ACCRUALS - Narrative (Details) $ in Thousands	1 Months Ended	8 Months Ended	12 Months Ended
	Jul. 31, 2016 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2018 USD ($) employee	Dec. 31, 2017 USD ($) employee	Dec. 31, 2016 USD ($)	Oct. 27, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 17,015	$ 9,436	$ 2,740
Long-term portions of accrued restructuring			500	$ 200
Merger Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 16,134
Number of positions eliminated | employee			275	120
Expected future cost			$ 5,000
Merger Restructuring | Employee severance
Restructuring Cost and Reserve [Line Items]
Restructuring expense			14,735	$ 8,508
Merger Restructuring | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring expense			1,399
GENBAND Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expense			0	0
Restructuring liability assumed						$ 4,100
GENBAND Restructuring | Employee severance
Restructuring Cost and Reserve [Line Items]
Restructuring expense			0	0
Restructuring liability assumed						3,700
GENBAND Restructuring | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring expense			0	0
Restructuring liability assumed						$ 400
2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 2,000			531	1,500
2016 Restructuring | Employee severance
Restructuring Cost and Reserve [Line Items]
Restructuring expense	1,900			405
2016 Restructuring | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 100		0	126
Taqua Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 1,800		753	1,200
Taqua Restructuring Initiative | Employee severance
Restructuring Cost and Reserve [Line Items]
Restructuring expense		1,200		245	1,000
Taqua Restructuring Initiative | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 600	0	508	$ 200
Restructuring estimate | GENBAND Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 900	$ 300

X

- Definition

This item represents liabilities associated with restructuring or exit activities of the acquiree, existing at the acquisition date (present liabilities of the acquiree).

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Amount expected to be recognized in earnings for the specified restructuring cost.

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