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SEGMENT INFORMATION - Sales by Product (FY) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales | $ 1,075,538 | $ 957,931 | $ 932,253 | $ 916,034 | $ 759,982 | $ 675,574 | $ 723,601 | $ 772,031 | $ 3,881,756 | $ 2,931,188 | $ 3,307,998
Specialty Products & Electronics |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 1,350,727 | 1,374,580 | 1,733,881
Brake Products |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 749,959 | 588,081 | 627,552
Remanufacturing, Overhaul & Build |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 522,275 | 559,284 | 606,624
Transit Products |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 1,112,340 | 276,124 | 189,581
Other |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | $ 146,455 | $ 133,119 | $ 150,360

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