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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Details of Basic and Diluted Earnings Per Share (EPS) | The following table sets forth the details of basic and diluted earnings (loss) per share (EPS):
| Year ended December 31 |  |
In thousands, except per share |  | 2018 |  |  |  | 2017 |  |  | 2016 |  |
Net income (loss) | $ | (177,604 | ) |  |  | $ | 7,914 |  |  | $ | 21,554 |  |
Weighted average common shares outstanding used in basic EPS |  | 43,768 |  |  |  |  | 43,609 |  |  |  | 43,558 |  |
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs |  | — |  |  |  |  | 830 |  |  |  | 571 |  |
Weighted average common shares outstanding and common share equivalents used in diluted EPS |  | 43,768 |  |  |  |  | 44,439 |  |  |  | 44,129 |  |
Income (loss) per share |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ | (0.01 | ) |  |  | $ | (0.13 | ) |  | $ | (0.32 | ) |
Discontinued operations |  | (4.05 | ) |  |  |  | 0.30 |  |  |  | 0.81 |  |
Number of Potential Common Shares that have been Excluded from Computation of Diluted Earnings Per Share for Indicated Period Due to Their Anti-Dilutive Nature | The following table sets forth the potential common shares outstanding for stock options that were not included in the computation of diluted EPS for the period indicated, because their effect would be anti-dilutive:
| Year ended December 31 |  |
In thousands | 2018 |  |  |  | 2017 |  |  | 2016 |  |
Potential common shares |  | 1,379 |  |  |  |  | 610 |  |  |  | 596 |  |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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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