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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Brazil | Reduction of gross receipts tax |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Recovery of part of claim | $ 2,700,000 | $ 1,600,000 |  | $ 700,000 |
Brazil | Reduction of gross receipts tax | Minimum |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Estimated potential gain contingency, recoveries | 2,600,000 |  |  |  |
Brazil | Reduction of gross receipts tax | Maximum |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Estimated potential gain contingency, recoveries | 3,000,000 |  |  |  |
Indemnification agreements |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Liabilities recorded under indemnification agreements | 0 |  | $ 0 |  |
Tax Assessment | Brazil |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Estimated loss contingency |  |  |  |  | $ 6,100,000
Loss contingency liability recorded | $ 0 |  |  |  |
Tax Assessment, Interest | Brazil |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Estimated loss contingency |  |  |  |  | 2,300,000
Tax Assessment, Penalites | Brazil |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Estimated loss contingency |  |  |  |  | $ 800,000

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