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Earnings per Common Share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share for the three months ended March 31, 2013 and 2012:
 
 
Three Months Ended
 
 
March 31,
 
 
2013
 
2012
 
 
(in thousands except per share)
Basic EPS:
 
 
 
 
Net income
 
$
12,176

 
$
8,902

Less: Earnings allocated to participating securities
 
(123
)
 
(132
)
Earnings allocated to common shareholders
 
$
12,053

 
$
8,770

Weighted average common shares outstanding
 
39,348

 
39,195

Basic earnings per common share
 
$
0.31

 
$
0.22

Diluted EPS:
 
 
 
 
Earnings allocated to common shareholders
 
$
12,053

 
$
8,770

Weighted average common shares outstanding
 
39,348

 
39,195

Dilutive effect of equity awards
 
3

 
103

Weighted average diluted common shares outstanding
 
39,351

 
39,298

Diluted earnings per common share
 
$
0.31

 
$
0.22

Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive
 
9

 
46