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SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
segment
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Segment information          
Number of operating segments | segment     1    
Revenues $ 60,335 $ 65,835 $ 121,689 $ 129,510  
Identifiable assets $ 185,398   $ 185,398   $ 179,919
Sales          
Segment information          
Percentage of concentration risk 18.00% 19.00% 19.00% 19.00%  
Trade receivables          
Segment information          
Percentage of concentration risk     17.00%    
Outside the United States          
Segment information          
Revenues $ 27,550 $ 29,659 $ 55,721 $ 58,234  
Wholly owned foreign subsidiaries          
Segment information          
Revenues 24,810 $ 26,313 50,095 $ 51,920  
Identifiable assets $ 82,311   $ 82,311   $ 73,378