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(Loss) Earnings Attributable to Tennant Company Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Computation of Basic and Diluted (Loss) Earnings per Share
The computations of Basic and Diluted (Loss) Earnings Attributable to Tennant Company per Share were as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30
 
June 30
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net (Loss) Earnings Attributable to Tennant Company
$
(2,591
)
 
$
15,328

 
$
(6,548
)
 
$
19,767

Denominator:
 
 
 
 
 
 
 
Basic - Weighted Average Shares Outstanding
17,693,102

 
17,508,022

 
17,645,090

 
17,526,107

Effect of Dilutive Securities:
 
 
 
 
 
 
 
Share-Based Compensation Plans
—

 
425,221

 
—

 
428,060

Diluted - Weighted Average Shares Outstanding
17,693,102

 
17,933,243

 
17,645,090

 
17,954,167

Basic (Loss) Earnings per Share
$
(0.15
)
 
$
0.88

 
$
(0.37
)
 
$
1.13

Diluted (Loss) Earnings per Share
$
(0.15
)
 
$
0.85

 
$
(0.37
)
 
$
1.10