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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Settlement charges (1)   $ 4,232   $ 4,990
Domestic Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 35 35 $ 105 105
Interest cost 4,652 4,574 13,958 13,561
Expected return on plan assets (6,245) (6,450) (18,735) (20,281)
Amortization of prior service cost 0 0 0 0
Amortization of net loss 413 355 1,240 1,123
Settlement charges (1) [1] 0 4,232 0 4,990
Defined benefit plans (1,145) 2,746 (3,432) (502)
Multi-employer plans 0 0 0 0
Defined contribution plans 5,506 5,712 17,205 17,216
Total pension cost 4,361 8,458 13,773 16,714
Foreign Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 697 796 2,126 2,479
Interest cost 903 867 2,761 2,774
Expected return on plan assets (1,087) (1,174) (3,317) (3,714)
Amortization of prior service cost 16 0 47 1
Amortization of net loss 720 546 1,877 1,676
Settlement charges (1) [1] 0 0 0 0
Defined benefit plans 1,249 1,035 3,494 3,216
Multi-employer plans 227 226 717 687
Defined contribution plans 692 813 1,615 2,678
Total pension cost $ 2,168 2,074 $ 5,826 6,581
Americas Welding        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Settlement charges (1)   $ 4,232   $ 4,990
[1] Pension settlement charges resulting from lump sum pension payments in the three and nine months ended September 30, 2018.