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Earnings (Loss) Attributable to Tennant Company Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings (Loss) per Share
The computations of Basic and Diluted Earnings (Loss) Attributable to Tennant Company per Share were as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30
 
September 30
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net Earnings (Loss) Attributable to Tennant Company
$
3,559

 
$
11,477

 
$
(2,989
)
 
$
31,244

Denominator:
 
 
 
 
 
 
 
Basic - Weighted Average Shares Outstanding
17,729,857

 
17,498,808

 
17,673,656

 
17,516,941

Effect of Dilutive Securities:
 
 
 
 
 
 
 
Share-Based Compensation Plans
441,587

 
474,398

 
—

 
438,558

Diluted - Weighted Average Shares Outstanding
18,171,444

 
17,973,206

 
17,673,656

 
17,955,499

Basic Earnings (Loss) per Share
$
0.20

 
$
0.66

 
$
(0.17
)
 
$
1.78

Diluted Earnings (Loss) per Share
$
0.20

 
$
0.64

 
$
(0.17
)
 
$
1.74