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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net (Loss) Earnings Including Noncontrolling Interest	$ (6,205)	$ 46,614	$ 32,088
Other Comprehensive Income (Loss):
Foreign currency translation adjustments	28,356	109	(12,520)
Pension and retiree medical benefits	5,868	(2,248)	4,121
Cash flow hedge	(7,731)	(305)	164
Income Taxes:
Foreign currency translation adjustments	310	32	25
Pension and retiree medical benefits	(2,087)	504	(1,265)
Cash flow hedge	2,884	114	(61)
Total Other Comprehensive Income (Loss), net of tax	27,600	(1,794)	(9,536)
Total Comprehensive Income Including Noncontrolling Interest	21,395	44,820	22,552
Comprehensive Loss Attributable to Noncontrolling Interest	(10)	0	0
Comprehensive Income Attributable to Tennant Company	$ 21,405	$ 44,820	$ 22,552

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