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STOCK-BASED COMPENSATION Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
May 24, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, capital shares reserved for future issuance (in shares)     2,400,000
Common stock reserved for issuance to participants (in shares) 922,985    
Stock-based compensation $ 184 $ 696  
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 0 $ 0  
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 251,048 45,329  
Stock-based compensation $ 184 $ 696  
Non-Employee Director | Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 56,048    
Non-option equity instruments, outstanding, number (in shares) 1,359,692    
Americas, Asia Pacific and Europe | Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of shares issued based on performance of ebitda 70.00%    
Percentage of shares issued based on performance of group adjusted ebitda 30.00%    
Corporate | Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of shares issued based on performance of group adjusted ebitda 50.00%    
Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage 33.00%    
Tranche One | Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance and service conditions (in shares) 195,000    
Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage 33.00%    
Tranche Three      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage 34.00%