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ACQUISITIONS - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Combinations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 4,376,972 | $ 3,994,515 |
Gross profit |  |  |  |  |  |  |  |  | 1,235,821 | 1,099,878 |
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | $ 292,207 | $ 273,301 |
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |
As Reported (in dollars per share) | $ 0.36 | $ 0.91 | $ 0.87 | $ 0.92 | $ 0.51 | $ 0.70 | $ 0.75 | $ 0.77 | $ 3.05 | $ 2.72 | $ 3.34
Pro forma (in dollars per share) |  |  |  |  |  |  |  |  | $ 3.06 | $ 2.84 |

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