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FINANCIAL INSTRUMENTS - Reconciliation of Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Assets, at beginning of period | $ 437,099 |
Derecognition of call option |  | $ 455
Assets, at end of period | 687,764 | 437,099
Reconciliation of changes in fair value measurement, liabilities [abstract] |  |
Liabilities, at beginning of period | 99,183 |
Liabilities, at end of period | 249,050 | 99,183
Other financial liabilities related to business combinations | Level 3 of fair value hierarchy |  |
Reconciliation of changes in fair value measurement, liabilities [abstract] |  |
Liabilities, at beginning of period | 9,767 | 23,905
Fair value remeasurement | 85 | (6,700)
Reclassification to amortized cost |  | (1,778)
Acquisition of business | 6,835 | 3,029
Payments | (7,695) | (8,947)
Interests | 260 | 258
Liabilities, at end of period | 9,252 | 9,767
Foreign exchange forward contracts | Level 3 of fair value hierarchy |  |
Reconciliation of changes in fair value measurement, liabilities [abstract] |  |
Liabilities, at beginning of period | 0 | 2,797
Fair value remeasurement |  | (1,611)
Reclassification to amortized cost |  | 0
Acquisition of business |  | 0
Payments |  | (1,186)
Interests |  | 0
Liabilities, at end of period |  | 0
Convertible notes | Level 3 of fair value hierarchy |  |
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Assets, at beginning of period | 0 |
Fair value measurement | 0 |
Acquisition of business | 0 |
Payments | 3,350 |
Interests | 75 |
Assets, at end of period | 3,425 | 0
Call Options on Minority Interest | Level 3 of fair value hierarchy |  |
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Assets, at beginning of period | $ 0 | 455
Fair value measurement |  | 0
Derecognition of call option |  | (455)
Acquisition of business |  | 0
Payments |  | 0
Interests |  | 0
Assets, at end of period |  | $ 0

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- Definition Expiry date 2020-01-01: The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity. Effective 2020-01-01: The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 28 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_28_c&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_b&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_e&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 23 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_23&doctype=Standard -URIDate 2019-03-27 + Details
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