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Net Income (Loss) per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Computation of basic and diluted net income (loss) 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 June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Net income (loss) attributable to ION
$
(25,342
)
 
$
56,069

 
$
(60,356
)
 
$
805

Weighted average number of common shares outstanding
11,415

 
10,979

 
11,008

 
10,975

Effect of dilutive stock awards
—

 
1

 
—

 
2

Weighted average number of diluted common shares outstanding
11,415

 
10,980

 
11,008

 
10,977

 
 
 
 
 
 
 
 
Basic net income (loss) per share
$
(2.22
)
 
$
5.11

 
$
(5.48
)
 
$
0.07

Diluted net income (loss) per share
$
(2.22
)
 
$
5.11

 
$
(5.48
)
 
$
0.07