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RELATED PARTY TRANSACTIONS (Transactions between related parties) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related party transactions [abstract] |  |  |
Revenue from sale of goods and services, related party transactions | $ 449,665 | $ 593,729 | $ 917,218
Purchases of goods and services, related party transactions | 516,481 | 658,343 | 634,912
Finance income (expense) with related parties | 5,698 | 8,533 | 9,330
Dividends received | 6,299 | 3,111 | 8,837
Other income (expense), related party transactions | 1,807 | 1,915 | 1,504
Outstanding balances for related party transactions [abstract] |  |  |
Amounts receivable, related party transactions | 182,075 | 102,349 |
Non-consolidated parties |  |  |
Related party transactions [abstract] |  |  |
Revenue from sale of goods, related party transactions | 432,511 | 515,123 | 774,526
Revenue from rendering of services, related party transactions | 173 | 171 | 176
Purchases of goods, related party transactions | 347,638 | 408,309 | 483,182
Services received, related party transactions | 9,421 | 14,563 | 10,266
Finance income (expense) with related parties | 7,182 | 9,478 | 9,330
Dividends received | 6,299 | 3,111 | 8,837
Other income (expense), related party transactions | 765 | 929 | 1,012
Outstanding balances for related party transactions [abstract] |  |  |
Amounts receivable, related party transactions | 227,074 | 167,312 |
Advances to suppliers | 6,647 | 8,017 |
Amounts payable, related party transactions | (30,407) | (44,784) |
Other related parties |  |  |
Related party transactions [abstract] |  |  |
Revenue from sale of goods, related party transactions | 15,972 | 77,375 | 141,230
Revenue from rendering of services, related party transactions | 1,009 | 1,060 | 1,286
Purchases of goods, related party transactions | 83,738 | 71,324 | 50,928
Services received, related party transactions | 75,483 | 155,289 | 90,536
Purchases of goods and services received, related party transactions | 201 | 8,859 | 0
Finance expense lease contracts with related parties | (1,484) | (945) | 0
Other income (expense), related party transactions | 1,042 | 986 | $ 492
Outstanding balances for related party transactions [abstract] |  |  |
Amounts receivable, related party transactions | 3,674 | 5,027 |
Advances to suppliers | 7,732 | 15,936 |
Amounts payable, related party transactions | (29,095) | (41,849) |
Lease liabilities with other related parties | $ (3,550) | $ (7,310) |

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