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Net Income Per Share: (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine months ended September 30,
 
2013
 
2012
 
2013
 
2012
Net income
$
11,034

 
$
12,188

 
$
27,086

 
$
28,938

Weighted average number of common shares outstanding (for basic calculation)
14,684

 
14,321

 
14,603

 
14,153

Dilutive securities
640

 
505

 
536

 
460

Weighted average common and common equivalent shares outstanding (for diluted calculation)
15,324

 
14,826

 
15,139

 
14,613

EPS — basic
$
0.75

 
$
0.85

 
$
1.85

 
$
2.04

EPS — diluted
$
0.72

 
$
0.82

 
$
1.79

 
$
1.98