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INTANGIBLE ASSETS - Changes in intangible assets by type (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
INTANGIBLE ASSETS |  |  |
Balance at beginning of the year | R$ 673,262 | R$ 836,096 | R$ 972,089
Foreign exchange effect | 127,770 | 19,195 | 107,434
Acquisition | 154,250 | 100,313 | 67,388
Disposal |  |  | (3,879)
Amortization | (332,704) | (282,342) | (306,936)
Balance at end of the year | 622,578 | 673,262 | 836,096
Supplier relationships |  |  |
INTANGIBLE ASSETS |  |  |
Balance at beginning of the year | 21,415 | 26,719 | 32,786
Amortization | (4,637) | (5,304) | (6,067)
Balance at end of the year | 16,778 | 21,415 | 26,719
Software development |  |  |
INTANGIBLE ASSETS |  |  |
Balance at beginning of the year | 364,812 | 415,640 | 490,829
Foreign exchange effect | 42,890 | 6,137 | 28,598
Acquisition | 154,250 | 100,313 | 67,388
Disposal |  |  | (3,791)
Amortization | (188,083) | (157,278) | (167,384)
Balance at end of the year | R$ 373,869 | 364,812 | 415,640
Estimated useful lives | 7 years |  |
Customers contracts and relationships |  |  |
INTANGIBLE ASSETS |  |  |
Balance at beginning of the year | R$ 283,423 | 387,299 | 440,774
Foreign exchange effect | 83,806 | 12,586 | 77,593
Disposal |  |  | (88)
Amortization | (136,525) | (116,462) | (130,980)
Balance at end of the year | 230,704 | 283,423 | 387,299
Others |  |  |
INTANGIBLE ASSETS |  |  |
Balance at beginning of the year | 3,612 | 6,438 | 7,700
Foreign exchange effect | 1,074 | 472 | 1,243
Amortization | (3,459) | (3,298) | (2,505)
Balance at end of the year | R$ 1,227 | R$ 3,612 | R$ 6,438
Estimated useful lives | 5 years |  |
Minimum | Supplier relationships |  |  |
INTANGIBLE ASSETS |  |  |
Estimated useful lives | 5 years |  |
Minimum | Customers contracts and relationships |  |  |
INTANGIBLE ASSETS |  |  |
Estimated useful lives | 5 years |  |
Maximum | Supplier relationships |  |  |
INTANGIBLE ASSETS |  |  |
Estimated useful lives | 20 years |  |
Maximum | Customers contracts and relationships |  |  |
INTANGIBLE ASSETS |  |  |
Estimated useful lives | 20 years |  |

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- Definition The increase in intangible assets other than goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_vi&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease in intangible assets other than goodwill resulting from disposals. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_ii&doctype=Standard -URIDate 2020-01-01 + Details
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