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Net Income Per Common Share
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Net Income Per Common Share
Net Income Per Common Share
 
Basic net income per common share is computed by dividing net income by the weighted average number of common shares outstanding during the period. Weighted average common shares outstanding for the basic net income per common share calculation includes certain vested restricted stock units (RSUs) and performance stock units (PSUs) as there are no conditions under which those shares will not be issued. Diluted net income per common share is computed by dividing net income by the combination of other potentially dilutive weighted average common shares and the weighted average number of common shares outstanding during the period. Other potentially dilutive weighted average common shares include the dilutive effect of stock options, RSUs, and PSUs for each period using the treasury stock method. Under the treasury stock method, the exercise price of a share and the amount of compensation expense, if any, for future service that has not yet been recognized are assumed to be used to repurchase shares in the current period.

The following table sets forth the computation of basic and diluted net income per common share:

 
Three Months Ended
June 30
 
Six Months Ended
June 30
 
2017
 
2016
 
2017
 
2016
 
(thousands, except per-share data)
Net income
$
22,154

 
$
19,228

 
$
32,174

 
$
24,178

Weighted average common shares outstanding during the period (for basic calculation)
38,643

 
38,814

 
38,572

 
38,834

Dilutive effect of other potential common shares
359

 
158

 
359

 
16

Weighted average common shares and potential common shares (for diluted calculation)
39,002

 
38,972

 
38,931

 
38,850

 
 
 
 
 
 
 
 
Net income per common share - Basic
$
0.57

 
$
0.50

 
$
0.83

 
$
0.62

Net income per common share - Diluted
$
0.57

 
$
0.49

 
$
0.83

 
$
0.62



The computation of the dilutive effect of other potential common shares excludes stock awards representing no shares and 0.2 million shares of common stock, respectively, in the three months ended June 30, 2017 and 2016, and 0.1 million and 0.6 million shares of common stock, respectively, in the six months ended June 30, 2017 and 2016. Under the treasury stock method, the inclusion of these stock awards would have been antidilutive.