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Net Income (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
Year ended December 31,
In thousands except per share amounts
2014
 
2013
 
2012
Net income (loss) available to common stockholders
$
(1,155,884
)
 
$
(650,563
)
 
$
48,677

Weighted average shares:
 
 
 
 
 
Basic
102,441

 
97,864

 
89,437

Effect of stock-based compensation plans
—

 
—

 
166

Diluted
102,441

 
97,864

 
89,603

Income (loss) per share:
 
 
 
 
 
Basic
$
(11.28
)
 
$
(6.65
)
 
$
0.54

Diluted
$
(11.28
)
 
$
(6.65
)
 
$
0.54