Net Income (Loss) Per Share (Narrative) (Details) - shares |
3 Months Ended | |
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Mar. 31, 2019 |
Mar. 31, 2018 |
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Dilutive effect of outstanding stock options and shares associated with long-term incentive compensation plans | 0 | 0 |
| Stock Compensation Plan [Member] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Shares not included in the computation of diluted earnings per share | 1,311,090 | 1,332,272 |
| Performance Units [Member] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Shares not included in the computation of diluted earnings per share | 216,929 | 309,819 |
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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