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Acquisitions (Details 4) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Net Sales |  |  |  |
Pro forma | $ 270,791 | $ 269,689 | $ 517,163 | $ 497,896
As reported | 270,791 | 216,828 | 461,850 | 396,692
Net Earnings (Loss) Attributable to Tennant Company |  |  |  |
Pro forma | 10,308 | 13,577 | 10,260 | 15,889
As reported | $ (2,591) | $ 15,328 | $ (6,548) | $ 19,767
Net Earnings (Loss) Attributable to Tennant Company per Share |  |  |  |
Pro forma | $ 0.58 | $ 0.76 | $ 0.58 | $ 0.88
Diluted (Loss) Earnings per Share | $ (0.15) | $ 0.85 | $ (0.37) | $ 1.10
Fair Value Step-Up Adjustment To Acquired Inventory, Pro Forma Adjustment | $ 6,199 |  | $ 6,199 |

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