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GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill Balance by Reportable Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |
Goodwill | $ 194,052 | $ 187,591
Service Centers |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |
Goodwill | 160,934 | 154,473
Innovative Pumping Solutions |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |
Goodwill | 15,980 | 15,980
Supply Chain Services |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |
Goodwill | $ 17,138 | $ 17,138

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Details
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