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Common and Common Equivalent Shares (Tables) | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Schedule of Calculation of Shares Used in Basic and Diluted Net Income Per Share | The calculation of shares used in the basic and diluted net income per common share calculation for the three and nine months ended September 30, 2019 and 2018 is as follows (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Weighted average number of common shares outstanding |  |  | 82,441 |  |  |  | 90,984 |  |  |  | 83,846 |  |  |  | 92,239 |
Weighted average number of dilutive common share equivalents |  |  | — |  |  |  | 375 |  |  |  | — |  |  |  | 521 |
Weighted average number of common and common equivalent shares outstanding (a) |  |  | 82,441 |  |  |  | 91,359 |  |  |  | 84,846 |  |  |  | 92,760 |
Antidilutive securities not included in the diluted net income per common share calculation |  |  | 962 |  |  |  | 214 |  |  |  | 796 |  |  |  | 202 |
| (a) | Due to a loss for the three months and nine months ended September 30, 2019, no incremental shares are included because the effect would be antidilutive.

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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