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Net Income Per Share: (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine months ended September 30,
 
2015
 
2014
 
2015
 
2014
Net income
$
16,266

 
$
6,428

 
$
39,522

 
$
18,963

Weighted average number of common shares outstanding (for basic calculation)
15,894

 
15,319

 
15,790

 
15,220

Dilutive securities
681

 
169

 
619

 
277

Weighted average common and common equivalent shares outstanding (for diluted calculation)
16,575

 
15,488

 
16,409


15,497

EPS — basic
$
1.02

 
$
0.42

 
$
2.50

 
$
1.25

EPS — diluted
$
0.98

 
$
0.42

 
$
2.41

 
$
1.22