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Earnings per Share/Capital Stock: (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of reconciliation of Registrant's net income and weighted average Common Shares outstanding for calculating basic net income per share
Basic:
 
For The Three Months Ended September 30,
 
 For The Nine Months Ended 
 September 30,
(in thousands, except per share amounts)
 
2018
 
2017
 
2018
 
2017
Net income
 
$
22,952

 
$
21,006

 
50,082

 
56,499

Less: (a) Distributed earnings to common shareholders
 
10,102

 
9,349

 
28,831

 
27,064

Distributed earnings to participating securities
 
54

 
50

 
151

 
139

Undistributed earnings
 
12,796

 
11,607

 
21,100

 
29,296

 
 
 
 
 
 
 
 
 
          (b) Undistributed earnings allocated to common shareholders
 
12,727

 
11,546

 
20,991

 
29,147

Undistributed earnings allocated to participating securities
 
69

 
61

 
109

 
149

 
 
 
 
 
 
 
 
 
Total income available to common shareholders, basic (a) + (b)
 
$
22,829

 
$
20,895

 
$
49,822

 
$
56,211

 
 
 
 
 
 
 
 
 
Weighted average Common Shares outstanding, basic
 
36,737

 
36,659

 
36,728

 
36,625

 
 
 
 
 
 
 
 
 
Basic earnings per Common Share
 
$
0.62

 
$
0.57

 
$
1.36

 
$
1.53
Schedule of reconciliation of Registrant's net income and weighted average Common Shares outstanding for calculating diluted net income per share
The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding for calculating diluted net income per share:
Diluted:
 
For The Three Months Ended September 30,
 
 For The Nine Months Ended 
 September 30,
(in thousands, except per share amounts)
 
2018
 
2017
 
2018
 
2017
Common shareholders earnings, basic
 
$
22,829

 
$
20,895

 
$
49,822

 
$
56,211

Undistributed earnings for dilutive stock-based awards
 
69

 
61

 
109

 
149

Total common shareholders earnings, diluted
 
$
22,898

 
$
20,956

 
$
49,931

 
$
56,360

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding, basic
 
36,737

 
36,659

 
36,728

 
36,625

Stock-based compensation (1)
 
213

 
197

 
207

 
188

Weighted average common shares outstanding, diluted
 
36,950

 
36,856

 
36,935

 
36,813

 
 
 
 
 
 
 
 
 
Diluted earnings per Common Share
 
$
0.62

 
$
0.57

 
$
1.35

 
$
1.53

 
(1)     In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 47,792 and 70,702 stock options at September 30, 2018 and 2017, respectively, were deemed to be outstanding in accordance with the accounting guidance on earnings per share.  All of the 198,613 and 195,457 restricted stock units at September 30, 2018 and 2017, respectively, were included in the calculation of diluted EPS for the three and nine months ended September 30, 2018 and 2017.