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Earnings per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Calculation of earnings (loss) per share | Table 6.1 reconciles the numerators and denominators used to calculate basic and diluted EPS.
| Table | 6.1 |  |  |  |  |  |  |  |
Earnings per share |  |  |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands, except per share data) |  | 2018 |  | 2017 |  | 2018 |  | 2017
| Basic earnings per share: |  |  |  |  |  |  |  |
| Net income |  | $ | 181,900 |  |  | $ | 120,027 |  |  | $ | 512,351 |  |  | $ | 328,447 |
| Weighted average common shares outstanding - basic |  | 362,180 |  |  | 370,586 |  |  | 367,190 |  |  | 359,613 |
| Basic earnings per share |  | $ | 0.50 |  |  | $ | 0.32 |  |  | $ | 1.40 |  |  | $ | 0.91 |
| Diluted earnings per share: |  |  |  |  |  |  |
| Net income |  | $ | 181,900 |  |  | $ | 120,027 |  |  | $ | 512,351 |  |  | $ | 328,447 |
| Interest expense, net of tax (1): |  |  |  |  |  |  |  |
| 2% Convertible Senior Notes |  | — |  |  | — |  |  | — |  |  | 907 |
| 5% Convertible Senior Notes |  | — |  |  | — |  |  | — |  |  | 1,709 |
| 9% Convertible Junior Subordinated Debentures |  | 4,566 |  |  | 3,757 |  |  | 13,698 |  |  | 11,270 |
| Diluted income available to common shareholders |  | $ | 186,466 |  |  | $ | 123,784 |  |  | $ | 526,049 |  |  | $ | 342,333 |
| Weighted average common shares outstanding - basic |  | 362,180 |  |  | 370,586 |  |  | 367,190 |  |  | 359,613 |
| Effect of dilutive securities: |  |  |  |  |  |  |  |
| Unvested RSUs |  | 1,697 |  |  | 1,473 |  |  | 1,547 |  |  | 1,367 |
| 2% Convertible Senior Notes |  | — |  |  | — |  |  | — |  |  | 11,119 |
| 5% Convertible Senior Notes |  | — |  |  | — |  |  | — |  |  | 4,743 |
| 9% Convertible Junior Subordinated Debentures |  | 19,028 |  |  | 19,028 |  |  | 19,028 |  |  | 19,028 |
| Weighted average common shares outstanding - diluted |  | 382,905 |  |  | 391,087 |  |  | 387,765 |  |  | 395,870 |
| Diluted earnings per share |  | $ | 0.49 |  |  | $ | 0.32 |  |  | $ | 1.36 |  |  | $ | 0.86 |
(1) | The periods ended September 30, 2018 and 2017 were tax-effected at a rate of 21% and 35%, respectively.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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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