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SEGMENT INFORMATION - Geographic Area Data (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 | Sep. 30, 2018
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net 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 |
Long-Lived Assets | 573,972 |  |  |  | 518,376 |  |  |  | 573,972 | 518,376 | 353,193 | $ 557,423
United States |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,323,781 | 1,362,255 | 1,754,924 |
Long-Lived Assets | 211,608 |  |  |  | 205,895 |  |  |  | 211,608 | 205,895 | 171,362 |
United Kingdom |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 356,493 | 322,563 | 368,505 |
Long-Lived Assets | 57,668 |  |  |  | 54,215 |  |  |  | 57,668 | 54,215 | 63,694 |
Canada |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 279,013 | 206,258 | 204,674 |
Long-Lived Assets | 5,822 |  |  |  | 5,156 |  |  |  | 5,822 | 5,156 | 4,876 |
France |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 237,454 | 66,287 | 45,565 |
Long-Lived Assets | 57,849 |  |  |  | 33,636 |  |  |  | 57,849 | 33,636 | 7,194 |
Germany |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 208,817 | 98,364 | 92,422 |
Long-Lived Assets | 71,709 |  |  |  | 57,902 |  |  |  | 71,709 | 57,902 | 31,642 |
China |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 178,137 | 106,357 | 100,586 |
Long-Lived Assets | 36,388 |  |  |  | 42,672 |  |  |  | 36,388 | 42,672 | 12,256 |
Mexico |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 160,029 | 183,583 | 190,034 |
Long-Lived Assets | 9,117 |  |  |  | 8,766 |  |  |  | 9,117 | 8,766 | 8,839 |
Italy |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 142,037 | 45,771 | 38,164 |
Long-Lived Assets | 30,329 |  |  |  | 27,253 |  |  |  | 30,329 | 27,253 | 15,170 |
India |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 137,837 | 24,161 | 12,345 |
Long-Lived Assets | 12,519 |  |  |  | 1,271 |  |  |  | 12,519 | 1,271 | 1,946 |
Australia |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 136,127 | 82,099 | 86,809 |
Long-Lived Assets | 10,483 |  |  |  | 8,039 |  |  |  | 10,483 | 8,039 | 8,424 |
Brazil |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 69,378 | 51,493 | 84,595 |
Long-Lived Assets | 13,184 |  |  |  | 13,227 |  |  |  | 13,184 | 13,227 | 9,318 |
Other international |  |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 652,653 | 381,997 | 329,375 |
Long-Lived Assets | $ 57,296 |  |  |  | $ 60,344 |  |  |  | $ 57,296 | $ 60,344 | $ 18,472 |

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