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REVENUE RECOGNITION (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Net Sales (Note 2) $ 2,655,400 $ 3,003,272 $ 3,028,674
Welding Consumables [Member]      
Disaggregation of Revenue [Line Items]      
Net Sales (Note 2) 1,509,509 1,715,002 1,755,652
Welding Equipment [Member]      
Disaggregation of Revenue [Line Items]      
Net Sales (Note 2) $ 1,145,891 $ 1,288,270 $ 1,273,022