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SEGMENT INFORMATION (Revenue by product) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of products and services [line items] |  |  |
Net sales | $ 9,700,296 | $ 7,223,975 | $ 7,877,449
Semi-finished |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 123,752 | 19,878 | 88,264
Slabs |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 715,513 | 0 | 0
Hot rolled |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 3,366,697 | 2,763,403 | 3,049,433
Cold rolled |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 1,321,663 | 1,110,671 | 1,176,019
Coated |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 3,391,328 | 2,900,009 | 3,004,700
Roll-formed and tubular |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 472,253 | 413,991 | 509,034
Other products |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 309,090 | 16,023 | 49,999
Total sales |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | $ 9,700,296 | $ 7,223,975 | $ 7,877,449

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