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Acquisitions and Dispositiions - Narrative (Details)
$ in Thousands, £ in Millions
3 Months Ended 12 Months Ended
Oct. 31, 2018
USD ($)
Oct. 31, 2018
GBP (£)
Aug. 01, 2018
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 31, 2017
USD ($)
Business Acquisition [Line Items]                                
Goodwill       $ 602,970       $ 598,499         $ 602,970 $ 598,499 $ 373,764  
Total revenues       309,687 $ 302,534 $ 297,584 $ 279,541 273,803 $ 261,531 $ 259,875 $ 253,573   1,189,346 1,048,782 1,002,286  
Net income (loss)       $ (2,375) $ (21,097) $ 4,524 $ (534) $ (6,943) $ 9,588 $ 8,559 $ 24,524   $ (19,482) 35,728 $ (33,933)  
New Voice Media                                
Business Acquisition [Line Items]                                
Acquisition Cost $ 350,179                              
Acquisition cash paid 341,000                              
Foreign Currency Exchange Rate, Translation       1.31335                 1.31335      
Other Payments to Acquire Businesses 9,000                              
Goodwill 210,992     $ 213,540                 $ 213,540      
Intangible assets 154,300     $ 154,300                 154,300      
Acquisition related transaction costs                         $ 253 $ 9,627    
New Voice Media | Customer relationships                                
Business Acquisition [Line Items]                                
Intangible assets 87,000                              
New Voice Media | Trade names                                
Business Acquisition [Line Items]                                
Intangible assets 5,300                              
New Voice Media | Developed technology                                
Business Acquisition [Line Items]                                
Intangible assets $ 62,000                              
TokBox                                
Business Acquisition [Line Items]                                
Business Acquisition, Percentage of Voting Interests Acquired     100.00%                          
Acquisition Cost     $ 32,906                          
Goodwill     20,650                          
Intangible assets     15,602                          
TokBox | Customer relationships                                
Business Acquisition [Line Items]                                
Intangible assets     5,020                          
TokBox | Developed technology                                
Business Acquisition [Line Items]                                
Intangible assets     $ 10,582                          
Disposal Group, Not Discontinued Operations | Hosted Infrastructure Product Line                                
Business Acquisition [Line Items]                                
Disposal Group, Including Discontinued Operation, Consideration                               $ 4,000
Disposal Group, Including Discontinued Operation, Consideration Received At Closing                               1,000
Disposal Group, Including Discontinued Operation, Consideration To Be Received Six Months From Closing                               500
Disposal Group, Discontinued Operation, Consideration To Be Received Based On Achievement Of Financial Objectives                               $ 2,500
Disposal Group, Including Discontinued Operation, Gain on Sale                       $ 1,879        
United Kingdom, Pounds | New Voice Media                                
Business Acquisition [Line Items]                                
Acquisition cash paid | £   £ 260