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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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 
 June 30,
 
Six Months Ended 
 June 30,
 
2018
 
2017
 
2018
 
2017
 
(Dollars in thousands, except share and per share data)
Numerator:
 
 
 
 
 
 
 
Net income - numerator for earnings per common share
$
93,903

 
$
26,946

 
$
234,865

 
$
80,885

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding
90,326,747

 
88,897,203

 
90,172,812

 
88,772,831

Effect of dilutive securities:
 
 
 
 
 
 
 
Stock options and deferred compensation agreements
696,007

 
850,870

 
773,149

 
899,594

Restricted stock and restricted stock units
248,094

 
364,211

 
259,992

 
372,214

Denominator for earnings per common share - assuming dilution
91,270,848

 
90,112,284

 
91,205,953

 
90,044,639

 
 
 
 
 
 
 
 
Earnings per common share
$
1.04

 
$
0.30

 
$
2.60

 
$
0.91

Earnings per common share - assuming dilution
$
1.03

 
$
0.30

 
$
2.58

 
$
0.90