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Net Income (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
| Year ended December 31,
In thousands except per share amounts | 2017 |  | 2016 |  | 2015
Net income (loss) available to common stockholders: |  |  |  |  |
Income (loss) from continuing operations | $ | 10,925 |  |  | $ | 22,435 |  |  | $ | (287,811 | )
Income (loss) from discontinued operations | (12,244 | ) |  | 32,917 |  |  | (79,372 | )
| $ | (1,319 | ) |  | $ | 55,352 |  |  | $ | (367,183 | )
Weighted average shares: |  |  |  |  |
Basic | 180,096 |  |  | 159,853 |  |  | 129,639 |
Effect of stock-based compensation plans | 4,048 |  |  | 3,606 |  |  | — |
Diluted | 184,144 |  |  | 163,459 |  |  | 129,639 |
Basic income (loss) per share: |  |  |  |  |
Income (loss) from continuing operations | $ | 0.06 |  |  | $ | 0.14 |  |  | $ | (2.22 | )
Income (loss) from discontinued operations | (0.07 | ) |  | 0.21 |  |  | (0.61 | )
Basic | $ | (0.01 | ) |  | $ | 0.35 |  |  | $ | (2.83 | )
Diluted income (loss) per share: |  |  |  |  |
Income (loss) from continuing operations | $ | 0.06 |  |  | $ | 0.14 |  |  | $ | (2.22 | )
Income (loss) from discontinued operations | (0.07 | ) |  | 0.20 |  |  | (0.61 | )
Diluted | $ | (0.01 | ) |  | $ | 0.34 |  |  | $ | (2.83 | )

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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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