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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Reconciliations of Basic and Diluted Shares Calculations
The details of the computation of basic and diluted earnings per common share are as follows:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
(dollars in thousands, except for per share data)
2016
 
2015
 
2016
 
2015
Net income
$
36,624

 
$
22,638

 
$
73,957

 
$
52,684

 
 
 
 
 
 
 
 
Basic weighted average number of shares outstanding
196,270,119

 
195,747,954

 
196,243,714

 
195,746,817

Dilutive effect of stock options
2,171,196

 
1,961,128

 
2,080,292

 
2,000,830

Diluted weighted average number of shares outstanding
198,441,315

 
197,709,082

 
198,324,006

 
197,747,647

 
 
 
 
 
 
 
 
Basic net income per common share
$
0.19

 
$
0.12

 
$
0.38

 
$
0.27

Diluted net income per common share
$
0.18

 
$
0.11

 
$
0.37

 
$
0.27

Anti-dilutive shares excluded from diluted earnings per share computation
375,688

 
67,938

 
288,284

 
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