SEGMENT INFORMATION - Financial Information of Reportable Segments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) segment	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Financial information for the reportable segments
Number of operating segments (segments) | segment	3
Net sales	$ 1,004,388	$ 981,197
Cost of goods sold	638,940	612,798
Gross profit	365,448	368,399
Other segment expenses	200,086	201,090
EBIT	165,362	167,309
Special items charge	4,527	6,367
Adjusted EBIT	169,889	173,676
Special items charge	(4,527)	(6,367)
Interest income	2,255	3,221
Interest expense	(14,382)	(12,000)
Income before income taxes	153,235	158,530
Total assets	3,625,074	3,379,717	$ 3,520,142
Capital expenditures	26,949	26,256
Depreciation and amortization	23,784	21,586
Rationalization and asset impairment net charges	3,865	4,605
Acquisition costs	802	1,762
Inter-segment
Financial information for the reportable segments
Net sales	(41,188)	(41,479)
Corporate/Eliminations
Financial information for the reportable segments
Net sales	(41,188)	(41,479)
Cost of goods sold	(40,176)	(41,584)
Gross profit	(1,012)	105
Other segment expenses	1,440	11,945
EBIT	(2,452)	(11,840)
Special items charge	802	1,762
Adjusted EBIT	(1,650)	(10,078)
Special items charge	(802)	(1,762)
Total assets	(302,571)	(315,901)
Depreciation and amortization	(371)	(239)
Acquisition costs	802	1,762
Americas Welding
Financial information for the reportable segments
Net sales	653,107	624,099
Rationalization and asset impairment net charges	2,135
Americas Welding | Operating Segments
Financial information for the reportable segments
Net sales	683,479	654,077
Cost of goods sold	417,700	388,605
Gross profit	265,779	265,472
Other segment expenses	143,716	129,372
EBIT	122,063	136,100
Special items charge	2,135	0
Adjusted EBIT	124,198	136,100
Special items charge	(2,135)	0
Total assets	2,445,066	2,354,812
Capital expenditures	21,766	21,853
Depreciation and amortization	16,114	14,086
Americas Welding | Inter-segment
Financial information for the reportable segments
Net sales	30,372	29,978
International Welding
Financial information for the reportable segments
Net sales	219,061	235,761
Rationalization and asset impairment net charges	1,552	3,069
International Welding | Operating Segments
Financial information for the reportable segments
Net sales	225,893	244,169
Cost of goods sold	163,442	175,047
Gross profit	62,451	69,122
Other segment expenses	40,851	44,415
EBIT	21,600	24,707
Special items charge	1,412	3,069
Adjusted EBIT	23,012	27,776
Special items charge	(1,412)	(3,069)
Total assets	1,093,775	987,321
Capital expenditures	3,608	3,423
Depreciation and amortization	5,378	5,313
International Welding | Inter-segment
Financial information for the reportable segments
Net sales	6,832	8,408
The Harris Products Group
Financial information for the reportable segments
Net sales	132,220	121,337
Rationalization and asset impairment net charges	178	1,536
The Harris Products Group | Operating Segments
Financial information for the reportable segments
Net sales	136,204	124,430
Cost of goods sold	97,974	90,730
Gross profit	38,230	33,700
Other segment expenses	14,079	15,358
EBIT	24,151	18,342
Special items charge	178	1,536
Adjusted EBIT	24,329	19,878
Special items charge	(178)	(1,536)
Total assets	388,804	353,485
Capital expenditures	1,575	980
Depreciation and amortization	2,663	2,426
The Harris Products Group | Inter-segment
Financial information for the reportable segments
Net sales	$ 3,984	$ 3,093