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SEGMENT INFORMATION (Financial Information of Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Financial information for the reportable segments
Net sales (Note 2)	$ 757,021	$ 701,991
Revenue from Related Parties	0	0
Segment, including Inter-segment, sales	757,021	701,991
EBIT, as adjusted	112,674	88,710
Special items charge (Gain)	10,162	7,327
EBIT	102,512	81,383
Interest income	454	860
Interest expense	(5,813)	(6,318)
Income before income taxes	97,153	75,925
Rationalization and asset impairment charges (gains)	4,163	6,521
Corporate/Eliminations
Financial information for the reportable segments
Net sales (Note 2)	0	0
Revenue from Related Parties	(39,180)	(30,991)
Segment, including Inter-segment, sales	(39,180)	(30,991)
EBIT, as adjusted	(1,456)	(1,099)
Special items charge (Gain)	1,113
EBIT	(2,569)	(1,099)
Acquisition Transaction and Integration Costs	1,113
Acquisition Transaction and Integration Costs	1,113
Americas Welding [Member]
Financial information for the reportable segments
Rationalization and asset impairment charges (gains)		1,190
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	4,440
Americas Welding [Member] | Operating Segments
Financial information for the reportable segments
Net sales (Note 2)	425,242	418,535
Revenue from Related Parties	32,748	24,783
Segment, including Inter-segment, sales	457,990	443,318
EBIT, as adjusted	76,617	70,702
Special items charge (Gain)	4,440	1,190
EBIT	72,177	69,512
International Welding [Member]
Financial information for the reportable segments
Rationalization and asset impairment charges (gains)	4,163	5,331
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	446
Business Combination, Inventory Step Up		806
International Welding [Member] | Operating Segments
Financial information for the reportable segments
Net sales (Note 2)	223,079	197,923
Revenue from Related Parties	4,285	4,483
Segment, including Inter-segment, sales	227,364	202,406
EBIT, as adjusted	18,816	6,615
Special items charge (Gain)	4,609	6,137
EBIT	14,207	478
The Harris Products Group | Operating Segments
Financial information for the reportable segments
Net sales (Note 2)	108,700	85,533
Revenue from Related Parties	2,147	1,725
Segment, including Inter-segment, sales	110,847	87,258
EBIT, as adjusted	18,697	12,492
EBIT	$ 18,697	$ 12,492

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