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Net Income Per Share: (Tables)
 6 Months Ended
Jun. 30, 2012
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,
 
2012
 
2011
 
2012
 
2011
Net income
$
9,149

 
$
9,493

 
$
16,750

 
$
17,566

Weighted average number of common shares outstanding (for basic calculation)
14,179

 
13,852

 
14,067

 
13,772

Dilutive securities
441

 
405

 
417

 
394

Weighted average common and common equivalent shares outstanding (for diluted calculation)
14,620

 
14,257

 
14,484

 
14,166

EPS — basic
$
0.65

 
$
0.69

 
$
1.19

 
$
1.28

EPS — diluted
$
0.63

 
$
0.67

 
$
1.16

 
$
1.24