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REVENUE RECOGNITION (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales (Note 2)	$ 806,454	$ 668,888	$ 2,389,929	$ 1,961,606
Welding Consumables [Member]
Disaggregation of Revenue [Line Items]
Net sales (Note 2)	465,829	379,177	1,375,567	1,118,688
Welding Equipment [Member]
Disaggregation of Revenue [Line Items]
Net sales (Note 2)	$ 340,625	$ 289,711	$ 1,014,362	$ 842,918

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