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RATIONALIZATION AND ASSET IMPAIRMENTS (Summary of Activity Related to Rationalization Liabilities by Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalization and asset impairment charges (gains) | $ 45,468 | $ 15,188 | $ 25,285
Activity related to the rationalization liabilities by segment |  |  |
Balance at the beginning of the period | 8,202 | 11,192 |
Payments and other adjustments | (18,213) | (14,678) |
Charged to expense | 23,633 | 11,688 |
Balance at the end of the period | 13,622 | 8,202 | 11,192
International Welding [Member] |  |  |
Activity related to the rationalization liabilities by segment |  |  |
Balance at the end of the period | 12,560 |  |
Americas Welding [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalization and asset impairment charges (gains) | 26,870 | 1,716 |
Activity related to the rationalization liabilities by segment |  |  |
Payments and other adjustments | (4,712) |  |
Charged to expense | 4,737 |  |
Balance at the end of the period | 25 |  |
International Welding [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalization and asset impairment charges (gains) | 18,598 | 11,702 | 25,285
Activity related to the rationalization liabilities by segment |  |  |
Balance at the beginning of the period | 8,202 | 11,192 |
Payments and other adjustments | (13,501) | (14,678) |
Charged to expense | 18,896 | 11,688 |
Balance at the end of the period | 13,597 | $ 8,202 | $ 11,192
The Harris Products Group |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Rationalization and asset impairment charges (gains) | $ 1,770 |  |

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