REVENUE RECOGNITION (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales (Note 2)	$ 826,454	$ 590,727	$ 1,583,475	$ 1,292,718
Welding Consumables [Member]
Disaggregation of Revenue [Line Items]
Net sales (Note 2)	475,559	333,671	909,738	739,511
Welding Equipment [Member]
Disaggregation of Revenue [Line Items]
Net sales (Note 2)	$ 350,895	$ 257,056	$ 673,737	$ 553,207