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Net Income Per Share: (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
2015
 
2014
Net income
$
9,686

 
$
6,657

Weighted average number of common shares outstanding (for basic calculation)
15,693

 
15,097

Dilutive securities
541

 
298

Weighted average common and common equivalent shares outstanding (for diluted calculation)
16,234

 
15,395

EPS — basic
$
0.62

 
$
0.44

EPS — diluted
$
0.60

 
$
0.43