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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Earnings Per Share | The calculation of basic and diluted EPS was as follows:
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
|  | (In thousands, except per-share amounts) |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 86,700 |  |  | $ | 63,107 |  |  | $ | 152,414 |  |  | $ | 115,176 |
Income attributable to unvested participating securities |  |  | (483 | ) |  |  | (430 | ) |  |  | (917 | ) |  |  | (859 | )
Net income used in calculating basic EPS |  | $ | 86,217 |  |  | $ | 62,677 |  |  | $ | 151,497 |  |  | $ | 114,317 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average vested shares |  |  | 44,066 |  |  |  | 45,984 |  |  |  | 44,401 |  |  |  | 46,142 |
Basic EPS |  | $ | 1.96 |  |  | $ | 1.36 |  |  | $ | 3.41 |  |  | $ | 2.48 |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 86,700 |  |  | $ | 63,107 |  |  | $ | 152,414 |  |  | $ | 115,176 |
Income attributable to unvested participating securities |  |  | (482 | ) |  |  | (430 | ) |  |  | (915 | ) |  |  | (857 | )
Net income used in calculating diluted EPS |  | $ | 86,218 |  |  | $ | 62,677 |  |  | $ | 151,499 |  |  | $ | 114,319 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average vested shares |  |  | 44,066 |  |  |  | 45,984 |  |  |  | 44,401 |  |  |  | 46,142 |
Dilutive effect of incremental shares to be issued for contingently-issuable shares |  |  | 141 |  |  |  | 87 |  |  |  | 128 |  |  |  | 80 |
Weighted-average shares used in calculating diluted EPS |  |  | 44,207 |  |  |  | 46,071 |  |  |  | 44,529 |  |  |  | 46,222 |
Diluted EPS |  | $ | 1.95 |  |  | $ | 1.36 |  |  | $ | 3.40 |  |  | $ | 2.47 |

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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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