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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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