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Net Income (Loss) per Share (Tables)
 9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Computation of basic and diluted net income per common share
The following table summarizes the computation of basic and diluted net income (loss) per common share (in thousands, except per share amounts):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Net income (loss) attributable to ION
$
(20,383
)
 
$
(24,541
)
 
$
(19,578
)
 
$
52,626

Weighted average number of common shares outstanding
164,755

 
164,149

 
164,672

 
164,021

Effect of dilutive stock awards
—

 
—

 
—

 
305

Weighted average number of diluted common shares outstanding
164,755

 
164,149

 
164,672

 
164,326

Basic net income (loss) per share
$
(0.12
)
 
$
(0.15
)
 
$
(0.12
)
 
$
0.32

Diluted net income (loss) per share
$
(0.12
)
 
$
(0.15
)
 
$
(0.12
)
 
$
0.32