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Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Calculation of earnings (loss) per share | Table 4.1 reconciles basic and diluted EPS amounts:
| Table | 4.1 |  |  |  |  |  |
Earnings per share |  |  | Years Ended December 31,
(In thousands, except per share data) |  | 2017 |  | 2016 |  | 2015
| Basic earnings per share: |  |  |  |  |  |
| Net income |  | $ | 355,761 |  |  | $ | 342,517 |  |  | $ | 1,172,000 |
| Weighted average common shares outstanding - basic |  | 362,380 |  |  | 342,890 |  |  | 339,552 |
| Basic earnings per share |  | $ | 0.98 |  |  | $ | 1.00 |  |  | $ | 3.45 |
| Diluted earnings per share: |  |  |  |  |  |
| Net income |  | $ | 355,761 |  |  | $ | 342,517 |  |  | $ | 1,172,000 |
| Interest expense, net of tax (1): |  |  |  |  |  |
| 2% Notes |  | 907 |  |  | 6,111 |  |  | 7,928 |
| 5% Notes |  | 1,709 |  |  | 6,362 |  |  | 12,228 |
| 9% Debentures |  | 15,027 |  |  | 15,893 |  |  | 22,786 |
| Diluted income available to common shareholders |  | $ | 373,404 |  |  | $ | 370,883 |  |  | $ | 1,214,942 |
| Weighted-average shares - Basic |  | 362,380 |  |  | 342,890 |  |  | 339,552 |
| Effect of dilutive securities: |  |  |  |  |  |
| Unvested restricted stock units |  | 1,493 |  |  | 1,470 |  |  | 2,113 |
| 2% Notes |  | 8,317 |  |  | 54,450 |  |  | 71,917 |
| 5% Notes |  | 3,548 |  |  | 13,107 |  |  | 25,603 |
| 9% Debentures |  | 19,028 |  |  | 20,075 |  |  | 28,854 |
| Weighted average common shares outstanding - diluted |  | 394,766 |  |  | 431,992 |  |  | 468,039 |
| Diluted income per share |  | $ | 0.95 |  |  | $ | 0.86 |  |  | $ | 2.60 |
(1) | Interest expense for the years ended December 31, 2017, 2016 and 2015 has been tax effected at a rate of 35%.

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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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