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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2014
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, 2014 and 2013.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2014
2013
 
2014
2013
Net income
$
21,077

$
21,505

 
$
42,470

$
41,549

 
 
 
 
 
 
Weighted average common shares outstanding for basic earnings per share computation
44,044,260

43,480,502

 
44,021,166

43,335,682

Dilutive effects of stock-based compensation
531,703

427,785

 
572,689

376,978

Weighted average common shares outstanding for diluted earnings per common share computation
44,575,963

43,908,287

 
44,593,855

43,712,660

 
 
 
 
 
 
Basic earnings per common share
$
0.48

$
0.49

 
$
0.96

$
0.96

Diluted earnings per common share
$
0.47

$
0.49

 
$
0.95

$
0.95