Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Earnings (Loss) Including Noncontrolling Interest	$ 3,300	$ (3,957)
Other Comprehensive Income (Loss):
Foreign currency translation adjustments	8,381	2,400
Pension and retiree medical benefits	82	10
Cash flow hedge	(2,715)	(73)
Income Taxes:
Foreign currency translation adjustments	(17)	0
Pension and retiree medical benefits	(151)	(18)
Cash flow hedge	(501)	27
Total Other Comprehensive Income, net of tax	5,079	2,346
Total Comprehensive Income (Loss) Including Noncontrolling Interest	8,379	(1,611)
Comprehensive Income Attributable to Noncontrolling Interest	26	0
Comprehensive Income (Loss) Attributable to Tennant Company	$ 8,353	$ (1,611)