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Net Income (Loss) Per Share (Tables) | 12 Months Ended
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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 |

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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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