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Earnings per Share/Capital Stock: (Tables)
 9 Months Ended
Sep. 30, 2014
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
The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding used 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)
 
2014
 
2013
 
2014
 
2013
Net income
 
$
21,171

 
$
20,839

 
$
47,546

 
$
50,906

Less: (a) Distributed earnings to common shareholders
 
8,244

 
7,836

 
23,944

 
21,527

Distributed earnings to participating securities
 
48

 
48

 
133

 
123

Undistributed earnings
 
12,879

 
12,955

 
23,469

 
29,256

 
 
 
 
 
 
 
 
 
(b) Undistributed earnings allocated to common shareholders
 
12,805

 
12,877

 
23,340

 
29,089

Undistributed earnings allocated to participating securities
 
74

 
78

 
129

 
167

 
 
 
 
 
 
 
 
 
Total income available to common shareholders, basic (a)+(b)
 
$
21,049

 
$
20,713

 
$
47,284

 
$
50,616

 
 
 
 
 
 
 
 
 
Weighted average Common Shares outstanding, basic
 
38,704

 
38,696

 
38,744

 
38,613

 
 
 
 
 
 
 
 
 
Basic earnings per Common Share
 
$
0.54

 
$
0.54

 
$
1.22

 
$
1.31
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)
 
2014
 
2013
 
2014
 
2013
Common shareholders earnings, basic
 
$
21,049

 
$
20,713

 
$
47,284

 
$
50,616

Undistributed earnings for dilutive stock options
 
74

 
78

 
129

 
167

Total common shareholders earnings, diluted
 
$
21,123

 
$
20,791

 
$
47,413

 
$
50,783

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding, basic
 
38,704

 
38,696

 
38,744

 
38,613

Stock-based compensation (1)
 
226

 
227

 
219

 
222

Weighted average common shares outstanding, diluted
 
38,930

 
38,923

 
38,963

 
38,835

 
 
 
 
 
 
 
 
 
Diluted earnings per Common Share
 
$
0.54

 
$
0.53

 
$
1.22

 
$
1.31

 
(1)       In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 235,584 and 273,740 stock options at September 30, 2014 and 2013, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share.  All of the 224,543 and 236,891 restricted stock units at September 30, 2014 and 2013, respectively, were included in the calculation of diluted EPS for the nine months ended September 30, 2014 and 2013.