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EARNINGS PER SHARE - Computation of Earnings Per Share (FY) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Less: dividends declared - common shares and non-vested restricted stock | (11,586) |  | (11,518) |  |  |  |  |  |  | (34,682) | (30,693) | (42,218) | (32,430) | (26,963)
Undistributed earnings | $ 76,153 |  | $ 55,881 |  |  |  |  |  |  | $ 225,839 | $ 182,620 | $ 220,043 | $ 272,457 | $ 371,665
Percentage allocated to common shareholders (as a percent) | 99.70% |  | 99.70% |  |  |  |  |  |  | 99.70% | 99.40% | 99.70% | 99.70% | 99.70%
Undistributed earnings allocated to common shareholders | $ 75,925 |  | $ 55,713 |  |  |  |  |  |  | $ 225,161 | $ 181,524 | $ 219,383 | $ 271,640 | $ 370,550
Add: dividends declared - common shares | 11,552 |  | 11,485 |  |  |  |  |  |  | 34,579 | 30,508 | 42,092 | 32,333 | 26,875
Numerator for basic and diluted earnings per common share | $ 87,477 |  | $ 67,198 |  |  |  |  |  |  | $ 259,740 | $ 212,032 | $ 261,475 | $ 303,973 | $ 397,425
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per common share - weighted average shares (in shares) | 96,208 |  | 95,709 |  |  |  |  |  |  | 95,935 | 95,163 | 95,453 | 90,359 | 96,074
Assumed conversion of dilutive stock-based compensation plans (in shares) | 429 |  | 607 |  |  |  |  |  |  | 501 | 645 | 672 | 782 | 932
Denominator for diluted earnings per common shares - adjusted weighted average shares and assumed conversion (in shares) | 96,637 |  | 96,316 |  |  |  |  |  |  | 96,436 | 95,808 | 96,125 | 91,141 | 97,006
Net income per common share attributable to Wabtec shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Wabtec shareholders, basic (in dollars per share) | $ 0.91 | $ 0.51 | $ 0.70 | $ 0.75 | $ 0.77 | $ 0.42 | $ 0.92 | $ 1.00 | $ 1.03 | $ 2.71 | $ 2.23 | $ 2.74 | $ 3.37 | $ 4.14
Net income attributable to Wabtec shareholders (in dollars per share) | $ 0.91 | $ 0.51 | $ 0.70 | $ 0.75 | $ 0.77 | $ 0.42 | $ 0.91 | $ 1.00 | $ 1.02 | $ 2.70 | $ 2.22 | $ 2.72 | $ 3.34 | $ 4.10
Basic weighted average common shares outstanding and non rested restricted stock expected to vest (in shares) | 96,495 |  | 95,983 |  |  |  |  |  |  | 96,221 | 95,740 | 95,740 | 90,627 | 96,388

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