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Earnings (Loss) Attributable to Tennant Company Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings (Loss) per Share
The computations of Basic and Diluted Earnings (Loss) per Share were as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30
 
June 30
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net Earnings (Loss) Attributable to Tennant Company
$
12,744

 
$
(2,591
)
 
$
16,018

 
$
(6,548
)
Denominator:
 
 
 
 
 
 
 
Basic - Weighted Average Shares Outstanding
17,943,450

 
17,693,102

 
17,867,641

 
17,645,090

Effect of dilutive securities:
 
 
 
 
 
 
 
Share-based compensation plans
428,088

 
—

 
436,319

 
—

Diluted - Weighted Average Shares Outstanding
18,371,538

 
17,693,102

 
18,303,960

 
17,645,090

Basic Earnings (Loss) per Share
$
0.71

 
$
(0.15
)
 
$
0.90

 
$
(0.37
)
Diluted Earnings (Loss) per Share
$
0.69

 
$
(0.15
)
 
$
0.88

 
$
(0.37
)