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Net Income (Loss) per Share
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Net Income (Loss) per Share
Net Income (Loss) per Share
Basic net income (loss) per common share is computed by dividing net income (loss) applicable to common shares by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share is determined based on the assumption that dilutive restricted stock and restricted stock unit awards have vested and outstanding dilutive stock options have been exercised and the aggregate proceeds were used to reacquire common stock using the average price of such common stock for the period. The total number of shares issued or reserved for future issuance under outstanding stock options at March 31, 2015 and 2014 was 9,522,274 and 9,660,100, respectively, and the total number of shares of restricted stock and shares reserved for restricted stock units outstanding at March 31, 2015 and 2014 was 1,504,470 and 1,479,027, respectively. All outstanding stock awards for the three months ended March 31, 2015 were anti-dilutive.
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