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ACQUISITION - Schedule of Fair Value of Acquired Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Intangible assets:    
Goodwill $ 116,217 $ 116,217
SingleHop, LLC    
Business Acquisition [Line Items]    
Cash   2,823
Prepaid expenses and other assets   2,227
Property, plant and equipment   14,253
Other long-term assets   576
Intangible assets:    
Goodwill   66,008
Total assets acquired   140,787
Accounts payable and accrued liabilities   2,819
Deferred revenue   2,434
Long term liabilities   534
Net assets acquired   135,000
SingleHop, LLC | Noncompete agreements    
Intangible assets:    
Finite lived intangible assets   4,000
SingleHop, LLC | Trade names    
Intangible assets:    
Finite lived intangible assets   1,700
SingleHop, LLC | Technology    
Intangible assets:    
Finite lived intangible assets   15,100
SingleHop, LLC | Customer relationships    
Intangible assets:    
Finite lived intangible assets   $ 34,100