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Net Income per Share (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
2015
 
2014
Net income (loss) attributable to ION
$
(55,264
)
 
$
75,979

Weighted average number of common shares outstanding
164,567

 
163,847

Effect of dilutive stock awards
—

 
214

Weighted average number of diluted common shares outstanding
164,567

 
164,061

Basic net income (loss) per share
$
(0.34
)
 
$
0.46

Diluted net income (loss) per share
$
(0.34
)
 
$
0.46