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ACQUISITIONS AND DISPOSITIONS - Purchase Price Allocation - US Telecom (Details) - USD ($)
$ in Thousands
1 Months Ended
Jul. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Purchase price allocation:        
Goodwill   $ 63,970 $ 63,970 $ 62,873
U.S. Telecom        
Consideration Transferred        
Cash consideration $ 9,100      
Purchase price allocation:        
Property, plant and equipment 10,200      
Deferred tax liabilities 3,500      
Other long term liabilities 700      
Goodwill $ 3,100