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Earnings per Share/Capital Stock: (Tables)
 3 Months Ended
Mar. 31, 2015
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 March 31,
(in thousands, except per share amounts)
 
2015
 
2014
Net income
 
$
12,149

 
$
11,021

Less: (a) Distributed earnings to common shareholders
 
8,138

 
7,846

Distributed earnings to participating securities
 
45

 
43

Undistributed earnings
 
3,966

 
3,132

 
 
 
 
 
(b) Undistributed earnings allocated to common shareholders
 
3,945

 
3,114

Undistributed earnings allocated to participating securities
 
21

 
18

 
 
 
 
 
Total income available to common shareholders, basic (a)+(b)
 
$
12,083

 
$
10,960

 
 
 
 
 
Weighted average Common Shares outstanding, basic
 
38,205

 
38,747

 
 
 
 
 
Basic earnings per Common Share
 
$
0.32

 
$
0.28
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 March 31,
(in thousands, except per share amounts)
 
2015
 
2014
Common shareholders earnings, basic
 
$
12,083

 
$
10,960

Undistributed earnings for dilutive stock-based awards
 
21

 
18

Total common shareholders earnings, diluted
 
$
12,104

 
$
10,978

 
 
 
 
 
Weighted average common shares outstanding, basic
 
38,205

 
38,747

Stock-based compensation (1)
 
203

 
197

Weighted average common shares outstanding, diluted
 
38,408

 
38,944

 
 
 
 
 
Diluted earnings per Common Share
 
$
0.32

 
$
0.28

 
(1)       In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 198,764 and 247,064 stock options at March 31, 2015 and 2014, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share.  All of the 226,319 and 237,174 restricted stock units at March 31, 2015 and 2014, respectively, were included in the calculation of diluted EPS for the three months ended March 31, 2015 and 2014.