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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 |

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