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Earnings per Share/Capital Stock: (Tables)
 6 Months Ended
Jun. 30, 2013
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 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)
 
2013
 
2012
 
2013
 
2012
Net income
 
$
16,602

 
15,078

 
30,067

 
25,193

Less: (a)
 
Distributed earnings to common shareholders
 
6,854

 
5,287

 
13,693

 
10,560

 
 
Distributed earnings to participating securities
 
95

 
38

 
181

 
68

Undistributed earnings
 
9,653

 
9,753

 
16,193

 
14,565

 
 
 
 
 
 
 
 
 
 
 
(b)
 
Undistributed earnings allocated to common shareholders
 
9,522

 
9,683

 
15,982

 
14,472

 
 
Undistributed earnings allocated to participating securities
 
131

 
70

 
211

 
93

 
 
 
 
 
 
 
 
 
 
 
Total income available to common shareholders, basic (a)+(b)
 
$
16,376

 
$
14,970

 
$
29,675

 
$
25,032

 
 
 
 
 
 
 
 
 
Weighted average Common Shares outstanding, basic
 
19,306

 
18,882

 
19,285

 
18,857

Basic earnings per Common Share
 
$
0.85

 
$
0.79

 
$
1.54

 
$
1.33
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)
 
2013
 
2012
 
2013
 
2012
Common shareholders earnings, basic
 
$
16,376

 
$
14,970

 
$
29,675

 
$
25,032

Undistributed earnings for dilutive stock options
 
—

 
—

 
—

 
93

Total common shareholders earnings, diluted
 
$
16,376

 
$
14,970

 
$
29,675

 
$
25,125

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding, basic
 
19,306

 
18,882

 
19,285

 
18,857

Stock-based compensation (1)
 
40

 
63

 
39

 
131

Weighted average common shares outstanding, diluted
 
19,346

 
18,945

 
19,324

 
18,988

 
 
 
 
 
 
 
 
 
Diluted earnings per Common Share
 
$
0.85

 
$
0.79

 
$
1.54

 
$
1.32

 
(1)       In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 140,834 and 410,760 stock options at June 30, 2013 and 2012, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share.  All of the 130,453 and 147,109 restricted stock units at June 30, 2013 and 2012, respectively, were included in the calculation of diluted EPS for the six months ended June 30, 2013 and 2012.
Schedule of Pro forma per share data
Pro forma per share data for the three and six months ended June 30, 2013 on a post-split basis are presented below:
Earnings per share
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
As reported:
 
 
 
 
 
 
 
Basic weighted average shares outstanding (in 000's)
19,306

 
18,882

 
19,285

 
18,857

Basic earnings per share
$
0.85

 
$
0.79

 
$
1.54

 
$
1.33

 
 
 
 
 
 
 
 
Diluted weighted average shares outstanding (in 000's)
19,346

 
18,945

 
19,324

 
18,988

Diluted earnings per share
$
0.85

 
$
0.79

 
$
1.54

 
$
1.32

 
 
 
 
 
 
 
 
Pro forma two-for-one split adjusted:
 
 
 
 
 
 
 
Basic weighted average shares outstanding (in 000's)
38,612

 
37,764

 
38,570

 
37,714

Basic earnings per share
$
0.425

 
$
0.395

 
$
0.770

 
$
0.665

 
 
 
 
 
 
 
 
Diluted weighted average shares outstanding (in 000's)
38,692

 
37,890

 
38,648

 
37,976

Diluted earnings per share
$
0.425

 
$
0.395

 
$
0.770

 
$
0.660