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Acquisitions and Divestitures (Details 3) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Net Sales |  |  |  |
Pro forma |  | $ 261,921 |  | $ 777,832
As reported | $ 273,255 | 261,921 | $ 838,299 | 723,771
Net Earnings (Loss) Attributable to Tennant Company |  |  |  |
Pro forma |  | 5,800 |  | 14,875
As reported | $ 9,676 | $ 3,559 | $ 25,694 | $ (2,989)
Net Earnings (Loss) Attributable to Tennant Company per Share |  |  |  |
Pro forma |  | $ 0.32 |  | $ 0.84
As reported | $ 0.52 | $ 0.20 | $ 1.40 | $ (0.17)

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