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Calculation Of Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Schedule of Weighted Average Number of Shares [Table Text Block] | The following table presents the computation of weighted-average shares used in the calculation of basic and diluted earnings per share:
| Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
| (In thousands) |  |  |  |  |  |
Weighted-average shares of common stock outstanding | 114,655 |  | 118,194 |  | 115,456 |  | 118,966
Weighted-average potential shares of common stock outstanding: |  |  |  |  |  |  |
Unvested RSUs and ESPP | 176 |  | 375 |  | 243 |  | 444
Shares used to compute diluted earnings per share | 114,831 |  | 118,569 |  | 115,699 |  | 119,410

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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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