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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings (Loss) Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The computations of basic and diluted income per share for the years ended December 31, 2015, 2014, and 2013 are as follows:

December 31,

2015

2014

2013
Numerator:








Net income (loss)
$
17,956


$
(4,640
)

$
3,458

Denominator:








Basic earnings per share - weighted average shares outstanding
31,408


33,124


32,783

Effect of potential diluted securities:








Employee stock options and restricted stock units - dilutive shares
692


—


605

Convertible senior notes - dilutive shares
66

 
—

 
—

Diluted earnings per share - weighted average shares outstanding
32,166


33,124


33,388

Earnings per share:








Basic
$
0.57


$
(0.14
)

$
0.11

Diluted
$
0.56


$
(0.14
)

$
0.10