GOODWILL AND INTANGIBLES (Changes in Carrying Amount of Goodwill by Reportable Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Changes in the carrying amount of goodwill by reportable segment
Balance at the beginning of the period	$ 335,593	$ 337,107
Additions and adjustments	103,836	596
Foreign currency translation	(9,267)	(2,110)
Balance at the end of the period	430,162	335,593
Americas Welding [Member]
Changes in the carrying amount of goodwill by reportable segment
Balance at the beginning of the period	279,810	278,496
Foreign currency translation	173	1,314
Balance at the end of the period	279,983	279,810
International Welding [Member]
Changes in the carrying amount of goodwill by reportable segment
Balance at the beginning of the period	39,060	41,474
Additions and adjustments	77,317	697
Foreign currency translation	(9,284)	(3,111)
Balance at the end of the period	107,093	39,060
The Harris Products Group
Changes in the carrying amount of goodwill by reportable segment
Balance at the beginning of the period	16,723	17,137
Additions and adjustments	26,519	(101)
Foreign currency translation	(156)	(313)
Balance at the end of the period	$ 43,086	$ 16,723