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Earnings Per Share (Summary of Antidilutive Securities) (Details) - shares shares in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Stock Options |  |  |  |
Incremental shares from stock options and restricted stock: |  |  |  |
Antidilutive securities (in shares) | 1,227 | 1,766 | 1,238 | 1,567
Restricted Stock |  |  |  |
Incremental shares from stock options and restricted stock: |  |  |  |
Antidilutive securities (in shares) | 318 | 441 | 302 | 377
Performance Based Shares |  |  |  |
Incremental shares from stock options and restricted stock: |  |  |  |
Antidilutive securities (in shares) | 345 | 313 | 349 | 299

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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://www.xbrl.org/2003/role/disclosureRef -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 Schedule of antidilutive securities excluded from computation of earnings per share. + References No definition available. + Details
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