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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2018
Commitments and contingencies |  |
Environmental Remediation Expense | $ 1,500,000 |
Brazil |  |
Commitments and contingencies |  |
Environmental Remediation Expense | $ 1,500,000 | $ 0
Brazil | Reduction of gross receipts tax |  |
Commitments and contingencies |  |
Estimated potential recoveries |  | 16,100,000
Recovery of part of claim |  | 631,000
Brazil | Minimum |  |
Commitments and contingencies |  |
Environmental Loss Contingencies Estimate |  | 1,500,000
Brazil | Maximum |  |
Commitments and contingencies |  |
Environmental Loss Contingencies Estimate |  | 3,000,000
Indemnification agreements |  |
Commitments and contingencies |  |
Liabilities recorded under indemnification agreements |  | $ 0

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