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Earnings per Share/Capital Stock: (Tables)
 6 Months Ended
Jun. 30, 2018
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
Basic:
 
For The Three Months Ended June 30,
 
 For The Six Months Ended 
 June 30,
(in thousands, except per share amounts)
 
2018
 
2017
 
2018
 
2017
Net income
 
$
16,348

 
$
22,792

 
27,130

 
35,493

Less: (a) Distributed earnings to common shareholders
 
9,367

 
8,861

 
18,729

 
17,715

Distributed earnings to participating securities
 
51

 
48

 
96

 
91

Undistributed earnings
 
6,930

 
13,883

 
8,305

 
17,687

 
 
 
 
 
 
 
 
 
          (b) Undistributed earnings allocated to common shareholders
 
6,894

 
13,807

 
8,263

 
17,597

Undistributed earnings allocated to participating securities
 
36

 
76

 
42

 
90

 
 
 
 
 
 
 
 
 
Total income available to common shareholders, basic (a) + (b)
 
$
16,261

 
$
22,668

 
$
26,992

 
$
35,312

 
 
 
 
 
 
 
 
 
Weighted average Common Shares outstanding, basic
 
36,733

 
36,624

 
36,723

 
36,607

 
 
 
 
 
 
 
 
 
Basic earnings per Common Share
 
$
0.44

 
$
0.62

 
$
0.74

 
$
0.96
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)
 
2018
 
2017
 
2018
 
2017
Common shareholders earnings, basic
 
$
16,261

 
$
22,668

 
$
26,992

 
$
35,312

Undistributed earnings for dilutive stock-based awards
 
36

 
76

 
42

 
90

Total common shareholders earnings, diluted
 
$
16,297

 
$
22,744

 
$
27,034

 
$
35,402

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding, basic
 
36,733

 
36,624

 
36,723

 
36,607

Stock-based compensation (1)
 
179

 
201

 
173

 
192

Weighted average common shares outstanding, diluted
 
36,912

 
36,825

 
36,896

 
36,799

 
 
 
 
 
 
 
 
 
Diluted earnings per Common Share
 
$
0.44

 
$
0.62

 
$
0.73

 
$
0.96

 
(1)     In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 47,792 and 91,634 stock options at June 30, 2018 and 2017, respectively, were deemed to be outstanding in accordance with the accounting guidance on earnings per share.  All of the 204,909 and 208,059 restricted stock units at June 30, 2018 and 2017, respectively, were included in the calculation of diluted EPS for the three and six months ended June 30, 2018 and 2017.