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RATIONALIZATION AND ASSET IMPAIRMENTS (Summary of Activity Related to Rationalization Liabilities by Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Activity related to the rationalization liabilities by segment |  |
Balance at the beginning of the period | $ 5,190 | $ 7,665
Payments and other adjustments | (3,536) | (2,475)
Charged to expense | 5,149 |
Balance at the end of the period | 6,803 | 5,190
Americas Welding [Member] |  |
Activity related to the rationalization liabilities by segment |  |
Balance at the beginning of the period | 0 | 67
Payments and other adjustments | 0 | (67)
Charged to expense | 0 |
Balance at the end of the period | 0 | 0
International Welding [Member] |  |
Activity related to the rationalization liabilities by segment |  |
Balance at the beginning of the period | 5,190 | 7,598
Payments and other adjustments | (3,536) | (2,408)
Charged to expense | 5,149 |
Balance at the end of the period | $ 6,803 | $ 5,190

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