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RATIONALIZATION AND ASSET IMPAIRMENTS (Summary of Activity Related to Rationalization Liabilities by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Rationalization and asset impairment charges (gains)	$ 45,468	$ 15,188	$ 25,285
Activity related to the rationalization liabilities by segment
Balance at the beginning of the period	8,202	11,192
Payments and other adjustments	(18,213)	(14,678)
Charged to expense	23,633	11,688
Balance at the end of the period	13,622	8,202	11,192
International Welding [Member]
Activity related to the rationalization liabilities by segment
Balance at the end of the period	12,560
Americas Welding [Member]
Restructuring Cost and Reserve [Line Items]
Rationalization and asset impairment charges (gains)	26,870	1,716
Activity related to the rationalization liabilities by segment
Payments and other adjustments	(4,712)
Charged to expense	4,737
Balance at the end of the period	25
International Welding [Member]
Restructuring Cost and Reserve [Line Items]
Rationalization and asset impairment charges (gains)	18,598	11,702	25,285
Activity related to the rationalization liabilities by segment
Balance at the beginning of the period	8,202	11,192
Payments and other adjustments	(13,501)	(14,678)
Charged to expense	18,896	11,688
Balance at the end of the period	13,597	$ 8,202	$ 11,192
The Harris Products Group
Restructuring Cost and Reserve [Line Items]
Rationalization and asset impairment charges (gains)	$ 1,770

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