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SEGMENT INFROMATION - Segment Financial Information (FY) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [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
Income (loss) from operations | $ 125,179 | 91,545 | 101,666 | $ 113,356 | $ 114,512 | 62,623 | $ 119,400 | $ 132,375 | $ 142,209 | $ 379,981 | $ 329,535 | 421,079 | 456,607 | 608,854
Interest expense and other, net | (22,512) |  | (20,481) |  |  |  |  |  |  | (69,959) | (52,156) | (69,016) | (43,770) | (23,486)
Income (loss) from operations before income taxes | 102,667 |  | 81,185 |  |  |  |  |  |  | 310,022 | 277,379 | 352,063 | 412,837 | 585,368
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 82,974 | 76,970 | 103,248 | 69,795 | 64,734
Capital expenditures |  |  |  |  |  |  |  |  |  | 64,232 | 60,263 | 89,466 | 50,216 | 49,428
Segment assets | 8,553,226 | 6,579,980 |  |  |  | 6,581,018 |  |  |  | 8,553,226 |  | 6,579,980 | 6,581,018 | 3,229,513
Freight Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  | 1,396,588 | 1,543,098 | 2,054,715
Income (loss) from operations before income taxes | 79,420 |  | 61,424 |  |  |  |  |  |  | 233,390 | 195,811 |  |  |
Transit Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  | 2,485,168 | 1,388,090 | 1,235,283
Income (loss) from operations before income taxes | 60,735 |  | 47,358 |  |  |  |  |  |  | 186,794 | 155,383 |  |  |
Operating Segments | Freight Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  | 1,434,218 | 1,582,617 | 2,090,087
Income (loss) from operations | 79,420 |  | 61,424 |  |  |  |  |  |  | 233,390 | 195,811 | 264,276 | 343,578 | 483,284
Interest expense and other, net | 0 |  | 0 |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0
Income (loss) from operations before income taxes |  |  |  |  |  |  |  |  |  |  |  | 264,276 | 343,578 | 483,284
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 43,721 | 36,519 | 36,834
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 33,921 | 22,726 | 24,715
Segment assets |  | 3,504,289 |  |  |  | 2,949,668 |  |  |  |  |  | 3,504,289 | 2,949,668 | 2,708,724
Operating Segments | Transit Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  | 2,506,716 | 1,397,483 | 1,264,178
Income (loss) from operations | 60,735 |  | 47,358 |  |  |  |  |  |  | 186,794 | 155,383 | 188,219 | 170,569 | 151,631
Interest expense and other, net | 0 |  | 0 |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0
Income (loss) from operations before income taxes |  |  |  |  |  |  |  |  |  |  |  | 188,219 | 170,569 | 151,631
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 57,441 | 31,545 | 26,196
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 50,762 | 20,987 | 22,996
Segment assets |  | 7,562,122 |  |  |  | 6,720,302 |  |  |  |  |  | 7,562,122 | 6,720,302 | 2,202,614
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  | (59,178) | (48,912) | (46,267)
Intersegment Eliminations | Freight Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  | 37,630 | 39,519 | 35,372
Intersegment Eliminations | Transit Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  | 21,548 | 9,393 | 10,895
Corporate Activities and Elimination |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  |  |  |  | (59,178) | (48,912) | (46,267)
Income (loss) from operations | (14,976) |  | (7,116) |  |  |  |  |  |  | (40,203) | (21,659) | (31,416) | (57,540) | (26,061)
Interest expense and other, net | (22,512) |  | (20,481) |  |  |  |  |  |  | (69,959) | (52,156) | (69,016) | (43,770) | (23,486)
Income (loss) from operations before income taxes | $ (37,488) |  | $ (27,597) |  |  |  |  |  |  | $ (110,162) | $ (73,815) | (100,432) | (101,310) | (49,547)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 2,086 | 1,731 | 1,704
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 4,783 | 6,503 | 1,717
Segment assets |  | $ (4,486,431) |  |  |  | $ (3,088,952) |  |  |  |  |  | $ (4,486,431) | $ (3,088,952) | $ (1,681,825)

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