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SEGMENT INFORMATION (Revenue by product) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of products and services [line items] |  |  |
Net sales | $ 11,454,807 | $ 9,700,296 | $ 7,223,975
Semi-finished |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 103,099 | 123,752 | 19,878
Slabs |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 1,818,235 | 715,513 | 0
Hot rolled |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 3,961,144 | 3,366,697 | 2,763,403
Cold rolled |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 1,264,940 | 1,321,663 | 1,110,671
Coated |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 3,506,040 | 3,391,328 | 2,900,009
Roll-formed and tubular |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 437,514 | 472,253 | 413,991
Other products |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | 363,835 | 309,090 | 16,023
Total sales |  |  |
Disclosure of products and services [line items] |  |  |
Net sales | $ 11,454,807 | $ 9,700,296 | $ 7,223,975

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