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Earnings Per Share
12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Earnings Per Share

11.       Earnings Per Share

 

Set forth below is a reconciliation of the numerator and denominator for basic and diluted earnings per share calculations for the periods indicated:

 

Year ended December 31,  2017   2016   2015 
             
Numerator:               
Net income  $52,142   $87,472   $62,126 
Denominator:               
Weighted average number of common shares outstanding – Basic   17,725,494    18,931,415    18,696,659 
Dilutive effect of options and restricted stock units outstanding under the Company’s employee compensation plans   213,596    118,100    668,420 
Weighted average number of common shares outstanding – Diluted   17,939,090    19,049,515    19,365,079 

 

The dilutive effect of outstanding options and restricted stock units is calculated using the treasury stock method. There are no anti-dilutive stock options in 2017, 2016, and 2015 because the closing price of the Company’s stock on December 31, 2017, 2016, and 2015 exceeded the strike price of all outstanding options on each of those dates.