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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Earnings Per Share | The calculation of basic and diluted EPS was as follows:
|  | Year ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
| (In thousands, except per-share amounts) |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 324,094 |  |  | $ | 350,255 |  |  | $ | 219,414 |
Income attributable to unvested participating securities |  |  | (1,893 | ) |  |  | (2,526 | ) |  |  | (1,835 | )
Net income used in calculating basic EPS |  | $ | 322,201 |  |  | $ | 347,729 |  |  | $ | 217,579 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average vested shares |  |  | 43,854 |  |  |  | 45,598 |  |  |  | 47,411 |
Basic EPS |  | $ | 7.35 |  |  | $ | 7.63 |  |  | $ | 4.59 |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 324,094 |  |  | $ | 350,255 |  |  | $ | 219,414 |
Income attributable to unvested participating securities |  |  | (1,888 | ) |  |  | (2,521 | ) |  |  | (1,833 | )
Net income used in calculating diluted EPS |  | $ | 322,206 |  |  | $ | 347,734 |  |  | $ | 217,581 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average vested shares |  |  | 43,854 |  |  |  | 45,598 |  |  |  | 47,411 |
Dilutive effect of incremental shares to be issued for contingently-issuable shares |  |  | 131 |  |  |  | 91 |  |  |  | 42 |
Weighted-average shares used in calculating diluted EPS |  |  | 43,985 |  |  |  | 45,689 |  |  |  | 47,453 |
Diluted EPS |  | $ | 7.33 |  |  | $ | 7.61 |  |  | $ | 4.59 |

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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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