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INTANGIBLES - Intangible Assets Other Than Goodwill and Trademarks (FY) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
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Finite Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, net of accumulated amortization | $ 557,972 | $ 601,013 | $ 601,013 | $ 543,428
Patents And Other |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, net of accumulated amortization | 15,192 | 17,554 | 17,554 | 15,360
Intangible assets, accumulated amortization | 42,928 | 43,021 | 43,021 | 40,638
Customer Relationships |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, net of accumulated amortization | 542,780 | 583,459 | 583,459 | 528,068
Intangible assets, accumulated amortization | $ 151,007 | $ 126,824 | $ 126,824 | $ 87,334

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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