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Net Income Per Common Share (Tables)
6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Basic and diluted net income per common share
Basic and diluted net income per common share calculations are as follows as of the periods presented:
 
 
Three Months Ended
 
June 30,
 
2013
 
2012
Basic
 
 
 
Net income applicable to common stock
$
8,019

 
$
6,345

Average common shares outstanding
25,223,749

 
25,110,709

Net income per common share - basic
$
0.32

 
$
0.25

Diluted
 
 
 
Net income applicable to common stock
$
8,019

 
$
6,345

Average common shares outstanding
25,223,749

 
25,110,709

Effect of dilutive stock-based compensation
150,119

 
38,651

Average common shares outstanding - diluted
25,373,868

 
25,149,360

Net income per common share - diluted
$
0.32

 
$
0.25


 
Six Months Ended
 
June 30,
 
2013
 
2012
Basic
 
 
 
Net income applicable to common stock
$
15,590

 
$
12,319

Average common shares outstanding
25,205,092

 
25,094,852

Net income per common share - basic
$
0.62

 
$
0.49

Diluted
 
 
 
Net income applicable to common stock
$
15,590

 
$
12,319

Average common shares outstanding
25,205,092

 
25,094,852

Effect of dilutive stock-based compensation
129,806

 
49,282

Average common shares outstanding - diluted
25,334,898

 
25,144,134

Net income per common share - diluted
$
0.62

 
$
0.49

Diluted net income per common share due to their anti-dilutive effect
Stock options that could potentially dilute basic net income per common share in the future that were not included in the computation of diluted net income per common share due to their anti-dilutive effect were as follows for the periods presented:
 
 
Three Months Ended
 
June 30,
 
2013
 
2012
Number of shares
162,339
 
1,199,407
Range of exercise prices
$19.14 - $30.63
 
$14.96 - $30.63

 
Six Months Ended
 
June 30,
 
2013
 
2012
Number of shares
388,446
 
1,202,559
Range of exercise prices
$19.14 - $30.63
 
$14.96 - $30.63