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SEGMENT INFORMATION (Revenue by product) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of products and services [line items]      
Net sales $ 8,735,435 $ 10,192,818 $ 11,454,807
Semi-finished      
Disclosure of products and services [line items]      
Net sales 3,632 51,496 103,099
Slabs      
Disclosure of products and services [line items]      
Net sales 1,047,311 1,753,090 1,818,235
Hot rolled      
Disclosure of products and services [line items]      
Net sales 2,880,055 3,275,941 3,961,144
Cold rolled      
Disclosure of products and services [line items]      
Net sales 1,101,963 1,165,406 1,264,940
Coated      
Disclosure of products and services [line items]      
Net sales 3,015,132 3,263,463 3,506,040
Roll-formed and tubular      
Disclosure of products and services [line items]      
Net sales 413,337 380,688 437,514
Other products      
Disclosure of products and services [line items]      
Net sales 274,005 302,734 363,835
Total sales      
Disclosure of products and services [line items]      
Net sales $ 8,735,435 $ 10,192,818 $ 11,454,807