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ACQUISITIONS - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ 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
Business Combinations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 3,946,244 | $ 4,212,617 |
Gross profit |  |  |  |  |  |  |  |  | 1,095,101 | 1,275,835 |
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | $ 271,783 | $ 349,852 |
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |
As Reported (in dollars per share) | $ 0.51 | $ 0.70 | $ 0.75 | $ 0.77 | $ 0.42 | $ 0.91 | $ 1.00 | $ 1.02 | $ 2.72 | $ 3.34 | $ 4.10
Pro forma (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.82 | $ 3.83 |

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