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Earnings per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings per Share | Earnings 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%.
The computation of diluted EPS for the years ended December 31, 2017, 2016, and 2015 includes weighted average unvested restricted stock units outstanding of 1.5 million, 1.5 million, and 2.1 million, respectively. For the years ended December 31, 2017, 2016, and 2015, all of our then outstanding Convertible Senior Notes and Convertible Junior Subordinated Debentures are reflected in diluted earnings per share using the “if-converted” method. Under this method, if dilutive, the common stock related to the outstanding Convertible Senior Notes and/or Convertible Junior Debentures is assumed issued as of the beginning of the reporting period and the related interest expense, net of tax, is added back to earnings in calculating diluted EPS.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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