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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