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SEGMENT INFORMATION (Revenue by product) (Details) - USD ($)
$ in Thousands
 12 Months Ended
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