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SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Segment information          
Number of operating segments | segment     1    
Revenues derived from foreign subsidiaries $ 64,968 $ 61,040 $ 186,657 $ 190,550  
Identifiable assets $ 193,041   $ 193,041   $ 179,919
Revenues          
Segment information          
Percentage of concentration risk 18.00% 24.00% 19.00% 20.00%  
Trade receivables          
Segment information          
Percentage of concentration risk     19.00%    
Outside the United States          
Segment information          
Revenues derived from foreign subsidiaries $ 30,409 $ 26,670 $ 86,130 $ 84,904  
Wholly owned foreign subsidiaries          
Segment information          
Revenues derived from foreign subsidiaries 27,265 $ 23,218 77,360 $ 75,138  
Identifiable assets $ 83,502   $ 83,502   $ 73,378