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RESTRUCTURING ACCRUALS - Restructuring Initiatives (Details) - USD ($)
$ in Thousands
 1 Months Ended 8 Months Ended 12 Months Ended
Jul. 31, 2016
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     $ 10,176    
Initiatives charged to expense     17,015 $ 9,436 $ 2,740
Balance at the end of the period     979 10,176  
Taqua Restructuring Initiative          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     365 602  
Initiatives charged to expense   $ 1,800   753 1,200
Adjustments for changes in estimate       (49)  
Cash payments       (941)  
Balance at the end of the period       365 602
2016 Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     95 497  
Initiatives charged to expense $ 2,000     531 1,500
Adjustments for changes in estimate       (26)  
Cash payments       (907)  
Balance at the end of the period       95 497
Merger Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     7,595    
Initiatives charged to expense     16,134    
Adjustments for changes in estimate     (5)    
Cash payments     (21,043)    
Balance at the end of the period     2,681 7,595  
GENBAND Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     2,121 0  
Liability assumed in connection with Merger     0 4,094  
Initiatives charged to expense     0 0  
Adjustments for changes in estimate     886 (281)  
Cash payments     (2,890) (1,692)  
Balance at the end of the period     117 2,121 0
Employee severance | Taqua Restructuring Initiative          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     0 384  
Initiatives charged to expense   1,200   245 1,000
Adjustments for changes in estimate       (49)  
Cash payments       (580)  
Balance at the end of the period       0 384
Employee severance | 2016 Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     0 497  
Initiatives charged to expense 1,900     405  
Adjustments for changes in estimate       (26)  
Cash payments       (876)  
Balance at the end of the period       0 497
Employee severance | Merger Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     7,595 0  
Initiatives charged to expense     14,735 8,508  
Adjustments for changes in estimate     (5) 0  
Cash payments     (20,415) (913)  
Balance at the end of the period     1,910 7,595 0
Employee severance | GENBAND Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     1,916 0  
Liability assumed in connection with Merger     0 3,663  
Initiatives charged to expense     0 0  
Adjustments for changes in estimate     487 (158)  
Cash payments     (2,403) (1,589)  
Balance at the end of the period     0 1,916 0
Facilities | Taqua Restructuring Initiative          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     365 218  
Initiatives charged to expense   $ 600 0 508 200
Adjustments for changes in estimate     0 0  
Cash payments     (332) (361)  
Balance at the end of the period     33 365 218
Facilities | 2016 Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     95 0  
Initiatives charged to expense $ 100   0 126  
Adjustments for changes in estimate     0 0  
Cash payments     (37) (31)  
Balance at the end of the period     58 95 0
Facilities | Merger Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     0    
Initiatives charged to expense     1,399    
Adjustments for changes in estimate     0    
Cash payments     (628)    
Balance at the end of the period     771 0  
Facilities | GENBAND Restructuring          
Restructuring Reserve [Roll Forward]          
Balance at the beginning of the period     205 0  
Liability assumed in connection with Merger     0 431  
Initiatives charged to expense     0 0  
Adjustments for changes in estimate     399 (123)  
Cash payments     (487) (103)  
Balance at the end of the period     $ 117 $ 205 $ 0