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Net Income Per Share: (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table presents the calculation of net earnings per common share (“EPS”) — basic and diluted.
 
 
Three months ended June 30,
 
Six months ended June 30,
 
2013
 
2012
 
2013
 
2012
Net income
$
7,367

 
$
9,149

 
$
16,052

 
$
16,750

Weighted average number of common shares outstanding (for basic calculation)
14,617

 
14,179

 
14,562

 
14,067

Dilutive securities
599

 
441

 
585

 
417

Weighted average common and common equivalent shares outstanding (for diluted calculation)
15,216

 
14,620

 
15,147

 
14,484

EPS — basic
$
0.50

 
$
0.65

 
$
1.10

 
$
1.19

EPS — diluted
$
0.48

 
$
0.63

 
$
1.06

 
$
1.16