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Earnings Per Share
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Earnings Per Share
18.
(Loss) Earnings Attributable to Tennant Company Per Share
The computations of Basic and Diluted (Loss) Earnings Attributable to Tennant Company per Share for the years ended December 31 were as follows:
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Net (Loss) Earnings Attributable to Tennant Company
$
(6,195
)
 
$
46,614

 
$
32,088

Denominator:
 

 
 

 
 

Basic - Weighted Average Shares Outstanding
17,695,390

 
17,523,267

 
18,015,151

Effect of dilutive securities
—

 
452,916

 
478,296

Diluted - Weighted Average Shares Outstanding
17,695,390

 
17,976,183

 
18,493,447

Basic (Loss) Earnings per Share
$
(0.35
)
 
$
2.66

 
$
1.78

Diluted (Loss) Earnings per Share
$
(0.35
)
 
$
2.59

 
$
1.74


Excluded from the dilutive securities shown above were options to purchase and shares to be paid out under share-based compensation plans of 711,212, 356,598 and 222,092 shares of common stock during 2017, 2016 and 2015, respectively. These exclusions were made if the exercise prices of these options are greater than the average market price of our common stock for the period, if the number of shares we can repurchase under the treasury stock method exceeds the weighted shares outstanding in the options or if we have a net loss, as the effects are anti-dilutive.