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RATIONALIZATION AND ASSET IMPAIRMENTS (Summary of Activity Related to Rationalization Liabilities by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rationalization and asset impairment charges (gains) | $ 8,851 | $ 1,495 | $ 1,307 | $ 3,535 | $ 932 | $ 2,636 | $ 11,542 | $ 10,175 | $ 15,188 | $ 25,285 | $ 6,590
Activity related to the rationalization liabilities by segment |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | $ 11,192 |  |  |  | $ 6,803 | 11,192 | 6,803 |
Payments and other adjustments |  |  |  |  |  |  |  |  | (14,678) | (26,874) |
Charged to expense |  |  |  |  |  |  |  |  | 11,688 | 31,263 |
Balance at the end of the period | $ 8,202 |  |  |  | $ 11,192 |  |  |  | 8,202 | 11,192 | 6,803
Americas Welding [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rationalization and asset impairment charges (gains) |  |  |  |  |  |  |  |  | 1,716 |  |
International Welding [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rationalization and asset impairment charges (gains) |  |  |  |  |  |  |  |  | 11,702 | $ 25,285 | $ 5,498
The Harris Products Group |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rationalization and asset impairment charges (gains) |  |  |  |  |  |  |  |  | $ 1,770 |  |

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