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SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
segment
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Segment information      
Number of operating segments | segment 1    
Revenues derived from foreign subsidiaries $ 101,677 $ 92,382  
Identifiable assets $ 359,985   $ 349,197
Total Revenue | Customer Concentration Risk | Customer One      
Segment information      
Percentage of concentration risk 16.00% 13.00%  
Trade receivables | Customer Concentration Risk | Customer      
Segment information      
Percentage of concentration risk 19.00%   22.00%
Outside the United States      
Segment information      
Revenues derived from foreign subsidiaries $ 49,655 $ 43,389  
Identifiable assets 133,775   $ 133,466
Wholly owned foreign subsidiaries      
Segment information      
Revenues derived from foreign subsidiaries $ 45,035 $ 36,013