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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Calculation of Net Loss and Number of Shares Used to Compute Basic and Diluted Earnings Per Share
The net income (loss) and the number of shares used to compute basic and diluted earnings per share for the three and six-month periods ended June 30, 2016 and 2015 are as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
In thousands, except per share amounts
2016
 
2015
 
2016
 
2015
Net income (loss)
$
109,848

 
$
(63,160
)
 
$
56,061

 
$
(115,835
)
 
 
 
 
 
 
 
 
Shares used in basic computation
191,485

 
188,598

 
190,894

 
188,220

     Dilutive impact of employee equity award plans
3,084

 
—

 
2,610

 
—

Shares used in diluted computation
194,569

 
188,598

 
193,504

 
188,220

 
 
 
 
 
 
 
 
Net income per Share:
 
 
 
 
 
 
 
     Basic
$
0.57

 
$
(0.33
)
 
$
0.29

 
$
(0.62
)
     Diluted
$
0.56

 
$
(0.33
)
 
$
0.29

 
$
(0.62
)