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GOODWILL AND INTANGIBLES (Changes in Carrying Amount of Goodwill by Reportable Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Changes in the carrying amount of goodwill by reportable segment |  |  |  |  |
Balance at the beginning of the period | $ 281,294 |  | $ 234,582 |  |
Additions and adjustments | 53,987 | [1] | 52,157 | [2] |
Foreign currency translation | 1,826 |  | (5,445) |  |
Balance at the end of the period | 337,107 |  | 281,294 |  | $ 234,582
Americas Welding [Member] |  |  |  |  |
Changes in the carrying amount of goodwill by reportable segment |  |  |  |  |
Balance at the beginning of the period | 239,215 |  | 197,259 |  |
Additions and adjustments | 37,346 | [1] | 44,408 | [2] |
Impairment charge |  |  |  |  | (1,091)
Foreign currency translation | 1,935 |  | (2,452) |  |
Balance at the end of the period | 278,496 |  | 239,215 |  | 197,259
International Welding [Member] |  |  |  |  |
Changes in the carrying amount of goodwill by reportable segment |  |  |  |  |
Balance at the beginning of the period | 24,248 |  | 25,667 |  |
Additions and adjustments | 17,254 | [1] | 1,224 | [2] |
Foreign currency translation | (28) |  | (2,643) |  |
Balance at the end of the period | 41,474 |  | 24,248 |  | 25,667
The Harris Products Group |  |  |  |  |
Changes in the carrying amount of goodwill by reportable segment |  |  |  |  |
Balance at the beginning of the period | 17,831 |  | 11,656 |  |
Additions and adjustments | (613) | [1] | 6,525 | [2] |
Foreign currency translation | (81) |  | (350) |  |
Balance at the end of the period | $ 17,137 |  | $ 17,831 |  | $ 11,656
[1] | Additions to Americas Welding reflect goodwill recognized in the acquisition of Baker in 2019. Additions to International Welding reflect goodwill recognized in the acquisition of Askaynak in 2019.
[2] | Additions to Americas Welding reflect goodwill recognized in the acquisitions of Coldwater, Pro Systems and Inovatech in 2018. Additions to The Harris Products Group reflect goodwill recognized in the acquisition of Worthington in 2018.

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