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OTHER COMPREHENSIVE LOSS - Reclassifications Out of Accumulated Other Comprehensive Loss (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
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income (expense), net | $ 1,201 |  | $ (443) |  |  |  |  |  |  | $ 5,958 | $ 5,304 | $ 8,868 | $ 6,528 | $ 3,768
Interest expense, net | (23,713) |  | (20,038) |  |  |  |  |  |  | (75,917) | (57,460) | (77,884) | (50,298) | (27,254)
Income tax expense | (16,598) |  | (12,746) |  |  |  |  |  |  | (53,225) | (64,776) | (89,773) | (99,433) | (186,740)
Net income attributable to Wabtec shareholders | 87,739 | $ 48,948 | 67,399 | $ 72,025 | $ 73,889 | $ 46,328 | $ 82,428 | $ 90,485 | $ 94,163 | 260,521 | 213,313 | 262,261 | 304,887 | $ 398,628
Reclassification out of Accumulated Other Comprehensive Income | Amortization of initial net obligation and prior service cost |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income (expense), net | (375) |  | (422) |  |  |  |  |  |  | (1,126) | (1,266) | (1,496) | (1,652) |
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss (gain) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income (expense), net | 1,093 |  | 1,240 |  |  |  |  |  |  | 3,278 | 3,720 | 5,037 | 3,989 |
Reclassification out of Accumulated Other Comprehensive Income | Pension And Post Retirement Benefit Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income (expense), net | 718 |  | 818 |  |  |  |  |  |  | 2,152 | 2,454 | 3,541 | 2,337 |
Income tax expense | (198) |  | (226) |  |  |  |  |  |  | (594) | (678) | (979) | (695) |
Net income attributable to Wabtec shareholders | 520 |  | 592 |  |  |  |  |  |  | 1,558 | 1,776 | 2,562 | 1,642 |
Reclassification out of Accumulated Other Comprehensive Income | Derivative Contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net | 4,915 |  | 497 |  |  |  |  |  |  | 5,770 | 1,653 | 400 | 1,873 |
Income tax expense | (1,180) |  | (131) |  |  |  |  |  |  | (1,456) | (447) | (140) | (557) |
Net income attributable to Wabtec shareholders | $ 3,735 |  | $ 366 |  |  |  |  |  |  | $ 4,314 | $ 1,206 | $ 260 | $ 1,316 |

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