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Calculation Of Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
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,
| 2015 |  | 2014 |  | 2013
| (In thousands)
Weighted-average shares of common stock outstanding | 114,155 |  |  | 126,710 |  |  | 144,591 |
Weighted-average potential shares of common stock outstanding: |  |  |  |  |
Conversion spread related to Subordinated Convertible Debentures | 18,047 |  |  | 13,384 |  |  | 10,361 |
Unvested RSUs | 785 |  |  | 740 |  |  | 709 |
Stock options and ESPP | 44 |  |  | 61 |  |  | 125 |
Shares used to compute diluted earnings per share | 133,031 |  |  | 140,895 |  |  | 155,786 |

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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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