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SEGMENT INFORMATION (Revenue by product) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of products and services [line items]      
Net sales $ 16,090,744 $ 8,735,435 $ 10,192,818
Total sales      
Disclosure of products and services [line items]      
Net sales 16,090,744 8,735,435 10,192,818
Semi-finished      
Disclosure of products and services [line items]      
Net sales 167,138 3,632 51,496
Slabs      
Disclosure of products and services [line items]      
Net sales 1,304,437 1,047,311 1,753,090
Hot rolled      
Disclosure of products and services [line items]      
Net sales 6,356,576 2,880,055 3,275,941
Cold rolled      
Disclosure of products and services [line items]      
Net sales 1,990,143 1,101,963 1,165,406
Coated      
Disclosure of products and services [line items]      
Net sales 5,303,394 3,015,132 3,263,463
Roll-formed and tubular      
Disclosure of products and services [line items]      
Net sales 659,609 413,337 380,688
Other products      
Disclosure of products and services [line items]      
Net sales $ 309,447 $ 274,005 $ 302,734