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REVENUE RECOGNITION (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales (Note 2)	$ 757,021	$ 701,991
Welding Consumables [Member]
Disaggregation of Revenue [Line Items]
Net sales (Note 2)	434,179	405,840
Welding Equipment [Member]
Disaggregation of Revenue [Line Items]
Net sales (Note 2)	$ 322,842	$ 296,151

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