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Acquisitions (Details 4) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net Sales        
Pro forma $ 261,921 $ 250,050 $ 777,832 $ 747,943
As reported 261,921 200,134 723,771 596,826
Net Earnings (Loss) Attributable to Tennant Company        
Pro forma 5,800 7,696 14,875 20,659
As reported $ 3,559 $ 11,477 $ (2,989) $ 31,244
Net Earnings (Loss) Attributable to Tennant Company per Share        
Pro forma $ 0.32 $ 0.43 $ 0.84 $ 1.15
Diluted (Loss) Earnings per Share $ 0.20 $ 0.64 $ (0.17) $ 1.74
Fair Value Step-Up Adjustment To Acquired Inventory, Pro Forma Adjustment $ 2,246   $ 8,445