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Net Income (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2013
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 | 2013 |  | 2012 |  | 2011
Net income (loss) available to common stockholders | $ | (650,563 | ) |  | $ | 48,677 |  |  | $ | 93,499 |
Weighted average shares |  |  |  |  |
Basic | 97,864 |  |  | 89,437 |  |  | 89,383 |
Effect of share based compensation plans | — |  |  | 166 |  |  | 342 |
Diluted | 97,864 |  |  | 89,603 |  |  | 89,725 |
Income (loss) per share: |  |  |  |  |
Basic | $ | (6.65 | ) |  | $ | 0.54 |  |  | $ | 1.05 |
Diluted | $ | (6.65 | ) |  | $ | 0.54 |  |  | $ | 1.04 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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