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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Number of Weighted Average Shares | The number of weighted average shares used in the calculation of basic earnings per share and diluted earnings per share was as follows for the years ended December 31:
| 2020 |  | 2019 |  | 2018
| (In thousands)
Weighted average shares: |  |  |  |  |
Basic shares | 229,435 |  |  | 227,759 |  |  | 230,823 |
Equity-based compensation plans | 1,715 |  |  | 1,636 |  |  | 1,889 |
Diluted shares | 231,150 |  |  | 229,395 |  |  | 232,712 |

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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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