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Net Income Per Share: (Tables)
 6 Months Ended
Jun. 30, 2015
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,
 
2015
 
2014
 
2015
 
2014
Net income
$
13,570

 
$
5,878

 
$
23,256

 
$
12,535

Weighted average number of common shares outstanding (for basic calculation)
15,781

 
15,242

 
15,738

 
15,170

Dilutive securities
571

 
120

 
564

 
269

Weighted average common and common equivalent shares outstanding (for diluted calculation)
16,352

 
15,362

 
16,302


15,439

EPS — basic
$
0.86

 
$
0.39

 
$
1.48

 
$
0.83

EPS — diluted
$
0.83

 
$
0.38

 
$
1.43

 
$
0.81