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GOODWILL AND INTANGIBLES (Changes in Carrying Amount of Goodwill by Reportable Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes in the carrying amount of goodwill by reportable segment    
Balance at the beginning of the period $ 337,107 $ 281,294
Additions and adjustments 596 53,987
Foreign currency translation (2,110) 1,826
Balance at the end of the period 335,593 337,107
Americas Welding [Member]    
Changes in the carrying amount of goodwill by reportable segment    
Balance at the beginning of the period 278,496 239,215
Additions and adjustments   37,346
Foreign currency translation 1,314 1,935
Balance at the end of the period 279,810 278,496
International Welding [Member]    
Changes in the carrying amount of goodwill by reportable segment    
Balance at the beginning of the period 41,474 24,248
Additions and adjustments 697 17,254
Foreign currency translation (3,111) (28)
Balance at the end of the period 39,060 41,474
The Harris Products Group    
Changes in the carrying amount of goodwill by reportable segment    
Balance at the beginning of the period 17,137 17,831
Additions and adjustments (101) (613)
Foreign currency translation (313) (81)
Balance at the end of the period $ 16,723 $ 17,137