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Earnings per Share/Capital Stock: (Tables)
 6 Months Ended
Jun. 30, 2017
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)
 
2017
 
2016
 
2017
 
2016
Net income
 
$
22,792

 
$
16,742

 
35,493

 
26,892

Less: (a) Distributed earnings to common shareholders
 
8,861

 
8,188

 
17,715

 
16,369

Distributed earnings to participating securities
 
48

 
50

 
91

 
94

Undistributed earnings
 
13,883

 
8,504

 
17,687

 
10,429

 
 
 
 
 
 
 
 
 
(b) Undistributed earnings allocated to common shareholders
 
13,807

 
8,453

 
17,597

 
10,369

Undistributed earnings allocated to participating securities
 
76

 
51

 
90

 
60

 
 
 
 
 
 
 
 
 
Total income available to common shareholders, basic (a)+(b)
 
$
22,668

 
$
16,641

 
$
35,312

 
$
26,738

 
 
 
 
 
 
 
 
 
Weighted average Common Shares outstanding, basic
 
36,624

 
36,554

 
36,607

 
36,538

 
 
 
 
 
 
 
 
 
Basic earnings per Common Share
 
$
0.62

 
$
0.46

 
$
0.96

 
$
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)
 
2017
 
2016
 
2017
 
2016
Common shareholders earnings, basic
 
$
22,668

 
$
16,641

 
$
35,312

 
$
26,738

Undistributed earnings for dilutive stock-based awards
 
76

 
51

 
90

 
60

Total common shareholders earnings, diluted
 
$
22,744

 
$
16,692

 
$
35,402

 
$
26,798

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding, basic
 
36,624

 
36,554

 
36,607

 
36,538

Stock-based compensation (1)
 
201

 
198

 
192

 
192

Weighted average common shares outstanding, diluted
 
36,825

 
36,752

 
36,799

 
36,730

 
 
 
 
 
 
 
 
 
Diluted earnings per Common Share
 
$
0.62

 
$
0.45

 
$
0.96

 
$
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, 91,634 and 142,402 stock options at June 30, 2017 and 2016, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share.  All of the 208,059 and 227,364 restricted stock units at June 30, 2017 and 2016, respectively, were included in the calculation of diluted EPS for the three and six months ended June 30, 2017 and 2016.