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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Calculation of EPS
The following table sets forth the calculation of EPS for the three and nine months ended September 30, 2018 and 2017.
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
(In thousands, except per share amounts)
Weighted average basic common shares outstanding
 
19,253

 
20,222

 
19,859

 
20,475

Dilutive effect of employee stock purchases, net of assumed repurchase of treasury stock
 
8

 
3

 
9

 
5

Weighted average dilutive common shares outstanding
 
19,261

 
20,225

 
19,868

 
20,480

Basic:
 
 
 
 
 
 
 
 
Net income
 
$
34,778

 
$
29,881

 
$
127,054

 
$
102,953

Less: Earnings allocated to participating securities
 
1,182

 
1,024

 
4,308

 
3,660

 Net income available to basic common shares
 
$
33,596

 
$
28,857

 
$
122,746

 
$
99,293

 Basic earnings per common share
 
$
1.74

 
$
1.43

 
$
6.18

 
$
4.85

Diluted:
 
 
 
 
 
 
 
 
Net income
 
$
34,778

 
$
29,881

 
$
127,054

 
$
102,953

Less: Earnings allocated to participating securities
 
1,181

 
1,023

 
4,306

 
3,659

 Net income available to diluted common shares
 
$
33,597

 
$
28,858

 
$
122,748

 
$
99,294

 Diluted earnings per common share
 
$
1.74

 
$
1.43

 
$
6.18

 
$
4.85