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ACQUISITIONS AND DISPOSITIONS - Disposition - Sovernet (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 08, 2017
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets and liabilities disposed          
Purchase of non-controlling interests     $ 9,663 $ 2,026 $ 3,598
Loss on deconsolidation of subsidiary       529  
Impairment charges     0 0 11,425
Goodwill impairment     $ 0    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sovernet          
Disposition          
Contingent consideration $ 2,000        
Fair value of contingent consideration       0  
Total cash proceeds including working capital adjustments 25,926        
Assets and liabilities disposed          
Cash 1,821        
Accounts receivable 1,696        
Inventory 639        
Prepayments and other current assets 1,034        
Property, plant and equipment 25,294        
Other assets 288        
Accounts payable and accrued liabilities (1,718)        
Advance payments and deposits (1,897)        
Net assets disposed 27,157        
Consideration less net assets disposed (1,231)        
Transaction costs: (1,156)        
(Loss) Gain (2,387)        
Purchase of non-controlling interests 700        
Non-controlling interest book value 0        
Loss on deconsolidation of subsidiary 500        
Transaction-related charges       $ 600 600
Impairment charges   $ 11,100     11,100
Impairment of long-lived assets   3,600     3,600
Goodwill impairment   $ 7,500     $ 7,500
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sovernet | Maximum          
Disposition          
Contingent consideration $ 4,000