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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Settlement charges (1) $ 758 $ 758
Foreign Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 728 851
Interest cost 936 970
Expected return on plan assets (1,124) (1,274)
Amortization of prior service cost 16 1
Amortization of net loss 585 575
Settlement charges (1) [1] 0 0
Defined benefit plans 1,141 1,123
Multi-employer plans 247 227
Defined contribution plans 499 829
Total pension cost 1,887 2,179
Domestic Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 35 35
Interest cost 4,653 4,494
Expected return on plan assets (6,245) (6,916)
Amortization of prior service cost 0 0
Amortization of net loss 413 384
Settlement charges (1) [1] 0 758
Defined benefit plans (1,144) (1,245)
Multi-employer plans 0 0
Defined contribution plans 5,908 5,894
Total pension cost $ 4,764 4,649
Americas Welding    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Settlement charges (1)   $ 758
[1] Pension settlement charges resulting from lump sum pension payments in the three months ended March 31, 2018.