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INTANGIBLE ASSETS AND GOODWILL (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Oct. 27, 2017
Sep. 26, 2016
Intangible Assets And Goodwill              
Weighted average amortization period (years)   7 years 10 months 18 days 7 years 9 months 7 days        
Cost $ 338,150       $ 281,450    
Accumulated amortization 86,759       37,036    
Net carrying value 251,391       244,414    
Amortization expense   $ 49,723 $ 17,112 $ 7,500      
Estimated future amortization expense for intangible assets              
2019 47,411            
2020 46,552            
2021 40,571            
2022 34,156            
2023 26,756            
Thereafter 55,945            
Total 251,391            
Impairment of intangible assets   0 5,471 0      
Goodwill [Roll Forward]              
Goodwill       52,499 338,822    
Accumulated impairment losses       (3,106) (3,106)    
Goodwill at the beginning of the period   335,716 49,393        
Goodwill at the end of the period 383,655 335,716 49,393 49,393 335,716    
Amortization and Impairment of Intangible Assets   $ 49,723 $ 22,583 7,500      
In-process research and development              
Intangible Assets And Goodwill              
Cost 5,600       5,600    
Accumulated amortization 0       0    
Net carrying value 5,600       5,600    
Developed technology              
Intangible Assets And Goodwill              
Weighted average amortization period (years)   6 years 10 months 27 days 6 years 10 months 25 days        
Cost 182,880       153,380    
Accumulated amortization 63,187       24,211    
Net carrying value 119,693       129,169    
Estimated future amortization expense for intangible assets              
Impairment of intangible assets 5,500            
Goodwill [Roll Forward]              
Amortization and Impairment of Intangible Assets   $ 38,976 $ 18,358 6,038      
Customer relationships              
Intangible Assets And Goodwill              
Weighted average amortization period (years)   9 years 5 months 10 days 9 years 3 months 26 days        
Cost 146,940       120,840    
Accumulated amortization 22,218       12,015    
Net carrying value 124,722       108,825    
Goodwill [Roll Forward]              
Amortization and Impairment of Intangible Assets   $ 10,203 $ 4,145 1,462      
Trade names              
Intangible Assets And Goodwill              
Weighted average amortization period (years)   5 years 2 months 12 days 3 years        
Cost 2,000       900    
Accumulated amortization 624       80    
Net carrying value 1,376       820    
Goodwill [Roll Forward]              
Amortization and Impairment of Intangible Assets   $ 544 $ 80 $ 0      
Internal use software              
Intangible Assets And Goodwill              
Weighted average amortization period (years)   3 years 3 years        
Cost 730       730    
Accumulated amortization 730       730    
Net carrying value 0       $ 0    
Edgewater              
Goodwill [Roll Forward]              
Acquisition   $ 48,053 $ 0        
Goodwill at the end of the period $ 48,053            
GENBAND              
Goodwill [Roll Forward]              
Acquisition   0 285,825        
Goodwill at the end of the period           $ 285,825  
Taqua, LLC              
Goodwill [Roll Forward]              
Acquisition   0 498        
Write-off of goodwill attributable to dissolved subsidiary   $ (114) $ 0        
Goodwill at the end of the period             $ 9,581