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SEGMENT INFORMATION (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) segment | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Segment information |  |  |
Number of operating segments | segment | 1 |  |
Identifiable assets | $ 312,017 |  | $ 285,301
Total Revenue |  |  |
Segment information |  |  |
Percentage of concentration risk | 16.00% | 21.00% |
Trade receivables |  |  |
Segment information |  |  |
Percentage of concentration risk | 20.00% |  | 13.00%
Outside the United States |  |  |
Segment information |  |  |
Revenues derived from foreign subsidiaries | $ 43,680 | $ 36,302 |
Wholly owned foreign subsidiaries |  |  |
Segment information |  |  |
Revenues derived from foreign subsidiaries | 34,579 | $ 32,405 |
Identifiable assets | $ 91,478 |  | $ 88,400

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