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GOODWILL AND INTANGIBLES (Changes in Carrying Amount of Goodwill by Reportable Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Changes in the carrying amount of goodwill by reportable segment      
Balance at the beginning of the period   $ 187,504 $ 180,127
Additions and adjustments   42,886 23,245
Impairment charge     (6,315)
Foreign currency translation   1,529 (9,553)
Balance at the end of the period   231,919 187,504
Americas Welding [Member]      
Changes in the carrying amount of goodwill by reportable segment      
Balance at the beginning of the period   152,335 138,192
Additions and adjustments   43,217 19,700
Impairment charge $ (6,315)   0
Foreign currency translation   826 (5,557)
Balance at the end of the period   196,378 152,335
International Welding [Member]      
Changes in the carrying amount of goodwill by reportable segment      
Balance at the beginning of the period   23,345 28,850
Additions and adjustments   (30) 3,846
Impairment charge     (6,315)
Foreign currency translation   349 (3,036)
Balance at the end of the period   23,664 23,345
The Harris Products Group      
Changes in the carrying amount of goodwill by reportable segment      
Balance at the beginning of the period   11,824 13,085
Additions and adjustments   (301) (301)
Impairment charge     0
Foreign currency translation   354 (960)
Balance at the end of the period   $ 11,877 $ 11,824