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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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