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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Settlement charges (1) $ 4,232 $ 5,283 $ 4,990 $ 5,283
Foreign Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 796 761 2,479 1,935
Interest cost 867 887 2,774 2,220
Expected return on plan assets (1,174) (1,163) (3,714) (3,062)
Amortization of prior service cost 0 4 1 12
Amortization of net loss 546 477 1,676 1,395
Settlement charges (1) [1] 0 0 0 0
Defined benefit plans 1,035 966 3,216 2,500
Multi-employer plans 226 217 687 634
Defined contribution plans 813 789 2,678 1,524
Total pension cost 2,074 1,972 6,581 4,658
Domestic Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 35 164 105 459
Interest cost 4,574 4,882 13,561 14,623
Expected return on plan assets (6,450) (8,306) (20,281) (23,648)
Amortization of prior service cost 0 0 0 0
Amortization of net loss 355 506 1,123 1,599
Settlement charges (1) [1] 4,232 5,283 4,990 5,283
Defined benefit plans 2,746 2,529 (502) (1,684)
Multi-employer plans 0 0 0 0
Defined contribution plans 5,712 5,390 17,216 17,224
Total pension cost 8,458 7,919 16,714 15,540
Americas Welding        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Settlement charges (1) $ 4,232 $ 5,283 $ 4,990 $ 5,283
[1] Pension settlement charges resulting from lump sum pension payments in the three and nine months ended September 30, 2018 and 2017.