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Earnings per Share/Capital Stock: (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
 For The Six Months Ended 
 June 30,
(in thousands, except per share amounts)
 
2015
 
2014
 
2015
 
2014
Net income
 
$
15,648

 
$
15,354

 
27,797

 
26,375

Less: (a) Distributed earnings to common shareholders
 
8,016

 
7,853

 
16,171

 
15,699

Distributed earnings to participating securities
 
47

 
47

 
89

 
87

Undistributed earnings
 
7,585

 
7,454

 
11,537

 
10,589

 
 
 
 
 
 
 
 
 
(b) Undistributed earnings allocated to common shareholders
 
7,541

 
7,411

 
11,474

 
10,530

Undistributed earnings allocated to participating securities
 
44

 
43

 
63

 
59

 
 
 
 
 
 
 
 
 
Total income available to common shareholders, basic (a)+(b)
 
$
15,557

 
$
15,264

 
$
27,645

 
$
26,229

 
 
 
 
 
 
 
 
 
Weighted average Common Shares outstanding, basic
 
37,702

 
38,781

 
37,952

 
38,764

 
 
 
 
 
 
 
 
 
Basic earnings per Common Share
 
$
0.41

 
$
0.39

 
$
0.73

 
$
0.68
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 June 30,
 
 For The Six Months Ended 
 June 30,
(in thousands, except per share amounts)
 
2015
 
2014
 
2015
 
2014
Common shareholders earnings, basic
 
$
15,557

 
$
15,264

 
$
27,645

 
$
26,229

Undistributed earnings for dilutive stock-based awards
 
44

 
43

 
63

 
59

Total common shareholders earnings, diluted
 
$
15,601

 
$
15,307

 
$
27,708

 
$
26,288

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding, basic
 
37,702

 
38,781

 
37,952

 
38,764

Stock-based compensation (1)
 
207

 
220

 
201

 
210

Weighted average common shares outstanding, diluted
 
37,909

 
39,001

 
38,153

 
38,974

 
 
 
 
 
 
 
 
 
Diluted earnings per Common Share
 
$
0.41

 
$
0.39

 
$
0.73

 
$
0.67

 
(1)       In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 187,152 and 245,784 stock options at June 30, 2015 and 2014, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share.  All of the 225,074 and 239,226 restricted stock units at June 30, 2015 and 2014, respectively, were included in the calculation of diluted EPS for the six months ended June 30, 2015 and 2014.