OTHER INCOME (EXPENSE) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Income and Expenses [Abstract]
Equity earnings in affiliates	$ 81	$ 206	$ 323	$ 3,002
Other income (expense) (1)	2,045	8,819	2,812	12,441
Other components of net periodic pension (cost) income	(1,064)	628	(1,967)	2,169
Total Other income (expense)	$ 1,062	9,653	1,168	17,612
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net			0	7,601
Acquisitions
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net			$ 0	7,601
International Welding
Other Income and Expenses [Abstract]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net		7,601		7,601
Acquisitions
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net		$ 7,601		$ 7,601