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Net Income Per Share: (Tables)
 9 Months Ended
Sep. 30, 2014
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,
 
2014
 
2013
 
2014
 
2013
Net income
$
6,428

 
$
11,034

 
$
18,963

 
$
27,086

Weighted average number of common shares outstanding (for basic calculation)
15,319

 
14,684

 
15,220

 
14,603

Dilutive securities
169

 
640

 
277

 
536

Weighted average common and common equivalent shares outstanding (for diluted calculation)
15,488

 
15,324

 
15,497

 
15,139

EPS — basic
$
0.42

 
$
0.75

 
$
1.25

 
$
1.85

EPS — diluted
$
0.42

 
$
0.72

 
$
1.22

 
$
1.79