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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings per Share
The following table sets forth the computation of basic and diluted earnings per share for the three and six month periods ended June 30, 2015 and 2014.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
2014
 
2015
2014
Net income
$
22,222

$
21,077

 
$
43,202

$
42,470

Weighted average common shares outstanding for basic earnings per share computation
45,143,122

44,044,260

 
45,260,104

44,021,166

Dilutive effects of stock-based compensation
463,564

531,703

 
582,935

573,689

Weighted average common shares outstanding for diluted earnings per common share computation
45,606,686

44,575,963

 
45,843,039

44,594,855

 
 
 
 
 
 
Basic earnings per common share
$
0.49

$
0.48

 
$
0.95

$
0.96

Diluted earnings per common share
$
0.49

$
0.47

 
$
0.94

$
0.95