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Calculation Of Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2019
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 June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (In thousands)
Weighted-average shares of common stock outstanding | 118,965 |  |  | 113,936 |  |  | 119,359 |  |  | 105,639 |
Weighted-average potential shares of common stock outstanding: |  |  |  |  |  |  |
Conversion spread related to Subordinated Convertible Debentures | — |  |  | 8,776 |  |  | — |  |  | 17,178 |
Unvested RSUs and ESPP | 396 |  |  | 488 |  |  | 478 |  |  | 582 |
Shares used to compute diluted earnings per share | 119,361 |  |  | 123,200 |  |  | 119,837 |  |  | 123,399 |

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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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