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Income (Loss) Per Common Share - Shares Excluded from EPS (Details) - shares shares in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Common share equivalents |  |
Diluted income (loss) per share |  |
Securities excluded from the diluted calculation as their effect would be antidilutive | 320 | 169
Potentially dilutive shares |  |
Diluted income (loss) per share |  |
Securities excluded from the diluted calculation as their effect would be antidilutive | 2,426 | 2,092
Potential shares to be issued for settlement of the Convertible Senior Notes |  |
Diluted income (loss) per share |  |
Securities excluded from the diluted calculation as their effect would be antidilutive | 8,618 | 8,618

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + 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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