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RESTRUCTURING AND FACILITIES CONSOLIDATION INTIATIVES - Restructuring Initiatives (Details) - USD ($)
$ in Thousands
 1 Months Ended 8 Months Ended 12 Months Ended
Jul. 31, 2016
Jun. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     $ 979    
Initiatives charged to expense     16,399 $ 17,015 $ 9,436
Cash payments       (1,000)  
Balance at the end of the period     3,510 979  
2019 Restructuring Initiative          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     0    
Initiatives charged to expense     7,475    
Cash payments     (4,374)    
Balance at the end of the period     3,101 0  
Merger Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     2,681 7,595  
Initiatives charged to expense     5,232 16,134  
Adjustments for changes in estimate       (5)  
Cash payments     (6,733) (21,043)  
Balance at the end of the period     409 2,681 7,595
GENBAND Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     117 2,121  
Initiatives charged to expense     600    
Adjustments for changes in estimate       886  
Cash payments       (2,890)  
Balance at the end of the period       117 2,121
2016 Restructuring          
Restructuring Reserve [Roll Forward]          
Initiatives charged to expense $ 2,000       500
Taqua Restructuring Initiative          
Restructuring Reserve [Roll Forward]          
Initiatives charged to expense   $ 1,800     700
Severance | 2019 Restructuring Initiative          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     0    
Initiatives charged to expense     6,103    
Cash payments     (3,993)    
Balance at the end of the period     2,110 0  
Severance | Merger Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     1,910 7,595  
Initiatives charged to expense     5,076 14,735 8,500
Adjustments for changes in estimate       (5)  
Cash payments     (6,577) (20,415)  
Balance at the end of the period     409 1,910 7,595
Severance | GENBAND Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     0 1,916  
Adjustments for changes in estimate       487  
Cash payments       (2,403)  
Balance at the end of the period       0 1,916
Severance | 2016 Restructuring          
Restructuring Reserve [Roll Forward]          
Initiatives charged to expense 1,900       400
Severance | Taqua Restructuring Initiative          
Restructuring Reserve [Roll Forward]          
Initiatives charged to expense   1,200     200
Facilities          
Restructuring Reserve [Roll Forward]          
Balance at the end of the period     900    
Facilities | 2019 Restructuring Initiative          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     0    
Initiatives charged to expense     1,372    
Cash payments     (381)    
Balance at the end of the period     991 0  
Facilities | Merger Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     771 0  
Initiatives charged to expense     156 1,399  
Adjustments for changes in estimate       0  
Cash payments     (156) (628)  
Balance at the end of the period     0 771 0
Facilities | GENBAND Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     117 205  
Adjustments for changes in estimate       399  
Cash payments       (487)  
Balance at the end of the period     0 117 205
Facilities | 2016 Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     58 95  
Initiatives charged to expense $ 100       100
Cash payments     (58) (37)  
Balance at the end of the period     0 58 95
Facilities | Taqua Restructuring Initiative          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     33 365  
Initiatives charged to expense   $ 600     500
Cash payments       (332)  
Balance at the end of the period     0 $ 33 $ 365
Accounting Standards Update 2016-02 | Merger Restructuring          
Restructuring Reserve [Roll Forward]          
Adjustment for the impact of ASC 842 adoption     (771)    
Accounting Standards Update 2016-02 | Severance | Merger Restructuring          
Restructuring Reserve [Roll Forward]          
Adjustment for the impact of ASC 842 adoption     0    
Accounting Standards Update 2016-02 | Facilities | Merger Restructuring          
Restructuring Reserve [Roll Forward]          
Adjustment for the impact of ASC 842 adoption     (771)    
Accounting Standards Update 2016-02 | Facilities | GENBAND Restructuring          
Restructuring Reserve [Roll Forward]          
Adjustment for the impact of ASC 842 adoption     (117)    
Accounting Standards Update 2016-02 | Facilities | Taqua Restructuring Initiative          
Restructuring Reserve [Roll Forward]          
Adjustment for the impact of ASC 842 adoption     $ (33)