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Net Income (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
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 | 2015 |  | 2014 |  | 2013
Net income (loss) available to common stockholders | $ | (367,183 | ) |  | $ | (1,186,874 | ) |  | $ | (650,563 | )
Weighted average shares: |  |  |  |  |
Basic | 129,639 |  |  | 102,441 |  |  | 97,864 |
Effect of stock-based compensation plans | — |  |  | — |  |  | — |
Diluted | 129,639 |  |  | 102,441 |  |  | 97,864 |
Income (loss) per share: |  |  |  |  |
Basic | $ | (2.83 | ) |  | $ | (11.59 | ) |  | $ | (6.65 | )
Diluted | $ | (2.83 | ) |  | $ | (11.59 | ) |  | $ | (6.65 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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