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Earnings Per Share
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]    
Earnings Per Share
17.
Earnings (Loss) Attributable to Tennant Company 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

 
Excluded from the dilutive securities shown above were options to purchase and shares to be paid out under share-based compensation plans of 340,239 and 313,711 shares of common stock during the three months ended September 30, 2017 and 2016, respectively. Excluded from the dilutive securities shown above were options to purchase and shares to be paid out under share-based compensation plans of 714,687 and 382,075 shares of common stock during the nine months ended September 30, 2017 and 2016, respectively. These exclusions were made if the exercise prices of the 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 average shares outstanding in the options or if we have a net loss, as these effects are anti-dilutive.
Earnings Per Share
The computations of Basic and Diluted Earnings per Share for the years ended December 31 were as follows:
 
2016
 
2015
 
2014
Numerator:
 
 
 
 
 
Net Earnings
$
46,614

 
$
32,088

 
$
50,651

Denominator:
 

 
 

 
 

Basic - Weighted Average Shares Outstanding
17,523,267

 
18,015,151

 
18,217,384

Effect of dilutive securities
452,916

 
478,296

 
523,474

Diluted - Weighted Average Shares Outstanding
17,976,183

 
18,493,447

 
18,740,858

Basic Earnings per Share
$
2.66

 
$
1.78

 
$
2.78

Diluted Earnings per Share
$
2.59

 
$
1.74

 
$
2.70


Options to purchase 356,598, 222,092 and 91,199 shares of Common Stock were outstanding during 2016, 2015 and 2014, respectively, but were not included in the computation of diluted earnings per share. These exclusions are 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.