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Earnings per Share/Capital Stock: (Tables)
 3 Months Ended
Mar. 31, 2016
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)
 
2016
 
2015
Net income
 
$
10,150

 
$
12,149

Less: (a) Distributed earnings to common shareholders
 
8,181

 
8,138

Distributed earnings to participating securities
 
45

 
45

Undistributed earnings
 
1,924

 
3,966

 
 
 
 
 
          (b) Undistributed earnings allocated to common shareholders
 
1,914

 
3,945

Undistributed earnings allocated to participating securities
 
10

 
21

 
 
 
 
 
Total income available to common shareholders, basic (a)+(b)
 
$
10,095

 
$
12,083

 
 
 
 
 
Weighted average Common Shares outstanding, basic
 
36,521

 
38,205

 
 
 
 
 
Basic earnings per Common Share
 
$
0.28

 
$
0.32
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)
 
2016
 
2015
Common shareholders earnings, basic
 
$
10,095

 
$
12,083

Undistributed earnings for dilutive stock-based awards
 
10

 
21

Total common shareholders earnings, diluted
 
$
10,105

 
$
12,104

 
 
 
 
 
Weighted average common shares outstanding, basic
 
36,521

 
38,205

Stock-based compensation (1)
 
176

 
203

Weighted average common shares outstanding, diluted
 
36,697

 
38,408

 
 
 
 
 
Diluted earnings per Common Share
 
$
0.28

 
$
0.32

 
(1)       In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 142,402 and 198,764 stock options at March 31, 2016 and 2015, respectively, were deemed to be outstanding in accordance with the accounting guidance on earnings per share.  All of the 215,129 and 226,319 restricted stock units at March 31, 2016 and 2015, respectively, were included in the calculation of diluted EPS for the three months ended March 31, 2016 and 2015.