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v3.19.1

INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2018
INTANGIBLE ASSETS |
Summary of intangible assets |
|  |  |  |  |  | Customer |  |  |  |
|  | Supplier |  | Software |  | contracts and |  |  |  |
|  | relationships |  | development |  | relationships |  | Others |  | Total
Balance as of January 01, 2016 |  | 47,571 |  | 808,482 |  | 911,483 |  | 68,225 |  | 1,835,761
Foreign exchange effect |  | — |  | (60,464) |  | (140,812) |  | (7,509) |  | (208,785)
Acquisition |  | — |  | 40,643 |  | — |  | 13,401 |  | 54,044
Disposal |  | — |  | (2,145) |  | — |  | (13,050) |  | (15,195)
Amortization |  | (7,845) |  | (149,911) |  | (155,063) |  | (5,316) |  | (318,135)
(-) Effect of selling of subsidiary |  | — |  | — |  | — |  | (27,749) |  | (27,749)
Balance as of December 31, 2016 |  | 39,726 |  | 636,605 |  | 615,608 |  | 28,002 |  | 1,319,941
Foreign exchange effect |  | — |  | 2,947 |  | 3,835 |  | 884 |  | 7,666
Acquisition |  | — |  | 37,939 |  | — |  | — |  | 37,939
Disposal |  | — |  | — |  | (27,652) |  | — |  | (27,652)
Amortization |  | (6,940) |  | (149,150) |  | (125,621) |  | (3,486) |  | (285,197)
(-) Assets held for sale |  | — |  | (37,512) |  | (25,396) |  | (17,700) |  | (80,608)
Balance as of December 31, 2017 |  | 32,786 |  | 490,829 |  | 440,774 |  | 7,700 |  | 972,089
Foreign exchange effect |  | — |  | 28,598 |  | 77,593 |  | 1,243 |  | 107,434
Acquisition |  | — |  | 67,388 |  | — |  | — |  | 67,388
Disposal |  | — |  | (3,791) |  | (88) |  | — |  | (3,879)
Amortization |  | (6,067) |  | (167,384) |  | (130,980) |  | (2,505) |  | (306,936)
Balance as of December 31, 2018 |  | 26,719 |  | 415,640 |  | 387,299 |  | 6,438 |  | 836,096
Estimated useful lives |  | 5 to 20 years |  | 7 years |  | 5 to 20 years |  | 5 years |  |
Summary of intangible assets by segment |
|  | 2018 |  | 2017 |  | 2016
Brazil |  | 295,107 |  | 351,578 |  | 412,134
Special Steel |  | 136,910 |  | 152,640 |  | 219,878
South America |  | 1,441 |  | 1,863 |  | 7,606
North America |  | 402,638 |  | 466,008 |  | 680,323
|  | 836,096 |  | 972,089 |  | 1,319,941

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