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Net Income (Loss) Per Share (Tables)
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Reconciliation [Table Text Block]
A reconciliation of basic and diluted net income (loss) per share, together with the related shares outstanding in thousands is as follows:  
 
 
 
Three Months Ended
 
 
 
March 31,
 
 
 
2016
 
2015
 
 
 
 
 
 
 
Net income (loss)
 
$
(6,376)
 
$
11,647
 
 
 
 
 
 
 
 
 
Weighted average shares:
 
 
 
 
 
 
 
Basic shares
 
 
41,241
 
 
40,207
 
Effect of dilutive securities—options and warrants outstanding
 
 
-
 
 
2,672
 
Diluted shares
 
 
41,241
 
 
42,879
 
 
 
 
 
 
 
 
 
Net income (loss) per share - Basic
 
$
(0.15)
 
$
0.29
 
Net income (loss) per share - Diluted
 
$
(0.15)
 
$
0.27