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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the computation of earnings per common share and earnings per common share - assuming dilution:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2018
 
2017
 
2018
 
2017
 
(Dollars in thousands, except share and per share data)
Numerator:
 
 
 
 
 
 
 
Net income - numerator for earnings per common share
$
169,328

 
$
56,957

 
$
404,193

 
$
137,842

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding
90,485,567

 
89,068,770

 
90,278,209

 
88,872,562

Effect of dilutive securities:
 
 
 
 
 
 
 
Stock options and deferred compensation agreements
705,465

 
974,208

 
750,588

 
924,465

Restricted stock and restricted stock units
459,854

 
377,552

 
326,613

 
373,993

Denominator for earnings per common share - assuming dilution
91,650,886

 
90,420,530

 
91,355,410

 
90,171,020

 
 
 
 
 
 
 
 
Earnings per common share
$
1.87

 
$
0.64

 
$
4.48

 
$
1.55

Earnings per common share - assuming dilution
$
1.85

 
$
0.63

 
$
4.42

 
$
1.53