RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Domestic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		$ 39	$ 35	$ 78	$ 70
Interest cost		4,051	4,653	8,101	9,306
Expected return on plan assets		(5,711)	(6,245)	(11,422)	(12,490)
Amortization of prior service cost		0	0	0	0
Amortization of net loss		203	414	406	827
Settlement charges (1)	[1]	3,334	0	3,334	0
Defined benefit plans		1,916	(1,143)	497	(2,287)
Multi-employer plans		0	0	0	0
Defined contribution plans		4,751	5,791	10,377	11,699
Total pension cost		6,667	4,648	10,874	9,412
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		742	701	1,498	1,429
Interest cost		683	922	1,379	1,858
Expected return on plan assets		(1,014)	(1,106)	(2,021)	(2,230)
Amortization of prior service cost		16	15	31	31
Amortization of net loss		540	572	1,095	1,157
Settlement charges (1)	[1]	0	0	0	0
Defined benefit plans		967	1,104	1,982	2,245
Multi-employer plans		257	243	526	490
Defined contribution plans		773	424	1,475	923
Total pension cost		1,997	$ 1,771	3,983	$ 3,658
Americas Welding
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Settlement charges (1)		$ 3,334		$ 3,334

[1] Pension settlement charges resulting from lump sum pension payments in the three and six months ended June 30, 2020.