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OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Operating Segment Reporting |  |  |
Revenue | $ 15,640 | $ 41,285 | $ 41,285
Long-lived Assets | 563,316 |  | 557,565
Investment in MSC | 123,484 |  | 127,814
Canada |  |  |
Operating Segment Reporting |  |  |
Revenue | 8,943 |  | 15,868
Long-lived Assets | 83,798 |  | 84,119
Mexico |  |  |
Operating Segment Reporting |  |  |
Revenue | 5,798 |  | 25,417
Long-lived Assets | 25,873 |  | 26,524
United States |  |  |
Operating Segment Reporting |  |  |
Revenue | 899 |  |
Long-lived Assets | 138,670 |  | 127,617
Argentina |  |  |
Operating Segment Reporting |  |  |
Long-lived Assets | $ 314,975 |  | $ 319,305

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