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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
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