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Earnings Per Share - (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The Company’s basic and diluted earnings per share amounts are as follows:

Three Months Ended June 30,
 
Six Months Ended June 30,

2016

2015
 
2016
 
2015
Numerator:


 


 
 
 
 
Net income
$
7,601

 
$
6,027

 
$
21,540

 
$
7,875

Denominator:


 


 


 


Basic earnings per share - weighted average shares outstanding
30,779

 
31,663

 
30,869

 
31,724

Effect of potential dilutive securities:
 
 
 
 


 


Employee stock options and restricted stock units - dilutive shares
563

 
676

 
630

 
649

Convertible senior notes - dilutive shares
412

 
—

 
206

 
—

     Diluted earnings per share - weighted average shares outstanding
31,754

 
32,339

 
31,705

 
32,373

Earnings per share:
 

 
 

 
 

 
 

Basic
$
0.25

 
$
0.19

 
$
0.70

 
$
0.25

Diluted
$
0.24

 
$
0.19

 
$
0.68

 
$
0.24