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Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Calculation of earnings (loss) per share | Table 4.1 reconciles basic and diluted EPS amounts:
Earnings per share
Table | 4.1 |  |  |  |  |  |
|  | Years Ended December 31,
(In thousands, except per share data) |  | 2019 |  | 2018 |  | 2017
Basic earnings per share: |  |  |  |  |  |
Net income |  | $ | 673,763 |  |  | $ | 670,097 |  |  | $ | 355,761 |
Weighted average common shares outstanding - basic |  | 352,827 |  |  | 365,406 |  |  | 362,380 |
Basic earnings per share |  | $ | 1.91 |  |  | $ | 1.83 |  |  | $ | 0.98 |
Diluted earnings per share: |  |  |  |  |  |
Net income |  | $ | 673,763 |  |  | $ | 670,097 |  |  | $ | 355,761 |
Interest expense, net of tax (1): |  |  |  |  |  |
2% Notes |  | — |  |  | — |  |  | 907 |
5% Notes |  | — |  |  | — |  |  | 1,709 |
9% Debentures |  | 18,264 |  |  | 18,264 |  |  | 15,027 |
Diluted income available to common shareholders |  | $ | 692,027 |  |  | $ | 688,361 |  |  | $ | 373,404 |
Weighted-average shares - basic |  | 352,827 |  |  | 365,406 |  |  | 362,380 |
Effect of dilutive securities: |  |  |  |  |  |
Unvested restricted stock units |  | 2,069 |  |  | 1,644 |  |  | 1,493 |
2% Notes |  | — |  |  | — |  |  | 8,317 |
5% Notes |  | — |  |  | — |  |  | 3,548 |
9% Debentures |  | 19,028 |  |  | 19,028 |  |  | 19,028 |
Weighted average common shares outstanding - diluted |  | 373,924 |  |  | 386,078 |  |  | 394,766 |
Diluted income per share |  | $ | 1.85 |  |  | $ | 1.78 |  |  | $ | 0.95 |
(1) Interest expense for the years ended December 31, 2019, 2018 and 2017 has been tax effected at a rate of 21%, 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://fasb.org/us-gaap/role/ref/legacyRef -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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