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GOODWILL AND INTANGIBLES (Gross and Net Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2016
Gross intangible assets other than goodwill by asset class |  |  |
Finite-Lived Assets - Gross Amount |  | $ 193,138 | $ 210,332
Finite-Lived Assets - Accumulated Amortization |  | 88,338 | 97,357
Trademarks and trade names |  |  |
Gross intangible assets other than goodwill by asset class |  |  |
Finite-Lived Assets - Gross Amount |  | 36,754 | 44,372
Finite-Lived Assets - Accumulated Amortization |  | 18,243 | 20,648
Indefinite Lived Assets |  | 15,919 | 17,113
Customer relationships |  |  |
Gross intangible assets other than goodwill by asset class |  |  |
Finite-Lived Assets - Gross Amount |  | 77,590 | 85,816
Finite-Lived Assets - Accumulated Amortization |  | 33,932 | 39,033
Patents |  |  |
Gross intangible assets other than goodwill by asset class |  |  |
Finite-Lived Assets - Gross Amount |  | 24,208 | 28,073
Finite-Lived Assets - Accumulated Amortization |  | 6,884 | 11,467
Other |  |  |
Gross intangible assets other than goodwill by asset class |  |  |
Finite-Lived Assets - Gross Amount |  | 54,586 | 52,071
Finite-Lived Assets - Accumulated Amortization |  | 29,279 | $ 26,209
Finite-Lived Intangible Assets [Member] |  |  |
Gross intangible assets other than goodwill by asset class |  |  |
Asset Impairment Charges | $ 3,417 |  |
Americas Welding [Member] |  |  |
Gross intangible assets other than goodwill by asset class |  |  |
Asset Impairment Charges |  | $ 3,417 |

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