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Earnings per Share/Capital Stock: (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
 For The Six Months Ended 
 June 30,
(in thousands, except per share amounts)
 
2016
 
2015
 
2016
 
2015
Net income
 
$
16,742

 
$
15,648

 
26,892

 
27,797

Less: (a) Distributed earnings to common shareholders
 
8,188

 
8,016

 
16,369

 
16,171

Distributed earnings to participating securities
 
50

 
47

 
94

 
89

Undistributed earnings
 
8,504

 
7,585

 
10,429

 
11,537

 
 
 
 
 
 
 
 
 
(b) Undistributed earnings allocated to common shareholders
 
8,453

 
7,541

 
10,369

 
11,474

Undistributed earnings allocated to participating securities
 
51

 
44

 
60

 
63

 
 
 
 
 
 
 
 
 
Total income available to common shareholders, basic (a)+(b)
 
$
16,641

 
$
15,557

 
$
26,738

 
$
27,645

 
 
 
 
 
 
 
 
 
Weighted average Common Shares outstanding, basic
 
36,554

 
37,702

 
36,538

 
37,952

 
 
 
 
 
 
 
 
 
Basic earnings per Common Share
 
$
0.46

 
$
0.41

 
$
0.73

 
$
0.73
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)
 
2016
 
2015
 
2016
 
2015
Common shareholders earnings, basic
 
$
16,641

 
$
15,557

 
$
26,738

 
$
27,645

Undistributed earnings for dilutive stock-based awards
 
51

 
44

 
60

 
63

Total common shareholders earnings, diluted
 
$
16,692

 
$
15,601

 
$
26,798

 
$
27,708

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding, basic
 
36,554

 
37,702

 
36,538

 
37,952

Stock-based compensation (1)
 
198

 
207

 
192

 
201

Weighted average common shares outstanding, diluted
 
36,752

 
37,909

 
36,730

 
38,153

 
 
 
 
 
 
 
 
 
Diluted earnings per Common Share
 
$
0.45

 
$
0.41

 
$
0.73

 
$
0.73

 
(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 187,152 stock options at June 30, 2016 and 2015, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share.  All of the 227,364 and 225,074 restricted stock units at June 30, 2016 and 2015, respectively, were included in the calculation of diluted EPS for the six months ended June 30, 2016 and 2015.