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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Earnings Per Share | The calculation of basic and diluted EPS follows.
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
|  | (In thousands, except per-share amounts) |
Basic EPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 58,037 |  |  | $ | 49,350 |  |  | $ | 162,540 |  |  | $ | 141,924 |
Income attributable to unvested participating securities |  |  | (494 | ) |  |  | (379 | ) |  |  | (1,353 | ) |  |  | (1,196 | )
Net income used in calculating basic EPS |  | $ | 57,543 |  |  | $ | 48,971 |  |  | $ | 161,187 |  |  | $ | 140,728 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average vested shares |  |  | 47,008 |  |  |  | 50,082 |  |  |  | 47,736 |  |  |  | 51,494 |
Basic EPS |  | $ | 1.22 |  |  | $ | 0.98 |  |  | $ | 3.38 |  |  | $ | 2.73 |
Diluted EPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 58,037 |  |  | $ | 49,350 |  |  | $ | 162,540 |  |  | $ | 141,924 |
Income attributable to unvested participating securities |  |  | (493 | ) |  |  | (379 | ) |  |  | (1,352 | ) |  |  | (1,196 | )
Net income used in calculating diluted EPS |  | $ | 57,544 |  |  | $ | 48,971 |  |  | $ | 161,188 |  |  | $ | 140,728 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average vested shares |  |  | 47,008 |  |  |  | 50,082 |  |  |  | 47,736 |  |  |  | 51,494 |
Dilutive effect of incremental shares to be issued for contingently issuable shares |  |  | 43 |  |  |  | 22 |  |  |  | 39 |  |  |  | 32 |
Weighted-average shares used in calculating diluted EPS |  |  | 47,051 |  |  |  | 50,104 |  |  |  | 47,775 |  |  |  | 51,526 |
Diluted EPS |  | $ | 1.22 |  |  | $ | 0.98 |  |  | $ | 3.37 |  |  | $ | 2.73 |

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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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