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Calculation Of Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
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:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In thousands)
Weighted-average shares of common stock outstanding | 100,325 |  |  | 107,001 |  |  | 114,155 |
Weighted-average potential shares of common stock outstanding: |  |  |  |  |
Conversion spread related to Subordinated Convertible Debentures | 23,247 |  |  | 21,074 |  |  | 18,047 |
Unvested RSUs, and ESPP | 608 |  |  | 758 |  |  | 829 |
Shares used to compute diluted earnings per share | 124,180 |  |  | 128,833 |  |  | 133,031 |

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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://www.xbrl.org/2003/role/presentationRef -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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