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SEGMENT INFORMATION (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) segment | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
Segment information |  |  |
Number of operating segments | segment | 1 |  |
Identifiable assets | $ 343,990 |  | $ 305,828
Total Revenue |  |  |
Segment information |  |  |
Percentage of concentration risk | 13.00% | 16.00% |
Trade receivables |  |  |
Segment information |  |  |
Percentage of concentration risk | 13.00% |  | 20.00%
Outside the United States |  |  |
Segment information |  |  |
Revenues derived from foreign subsidiaries | $ 43,389 | $ 43,680 |
Wholly owned foreign subsidiaries |  |  |
Segment information |  |  |
Revenues derived from foreign subsidiaries | 36,013 | $ 34,579 |
Identifiable assets | $ 123,749 |  | $ 95,777

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