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Earnings Per Share
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Earnings per share
Earnings Per Share

The details of the computation of basic and diluted earnings per common share are as follows:

 
 
Three Months Ended March 31,
(dollars in thousands, except for per share data)
 
2016
 
2015
 
 
 
 
 
Net income
 
$
37,333

 
$
30,046

 
 
 
 
 
Basic weighted average number of shares outstanding
 
196,217,311

 
195,745,670

Dilutive effect of stock options
 
1,943,154

 
2,028,180

Diluted weighted average number of shares outstanding
 
198,160,465

 
197,773,850

 
 
 
 
 
Basic net income per common share
 
$
0.19

 
$
0.15

Diluted net income per common share
 
$
0.19

 
$
0.15

Anti-dilutive shares excluded from diluted earnings per share computation
 
102,990

 
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