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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
Summary of Earnings Per Share, Basic and Diluted | The calculation and reconciliation of basic and diluted earnings per share for the three and nine months ended September 30 (in thousands, except per share data) follows:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Net income |  | $ | 129,618 |  |  | $ | 116,770 |  |  | $ | 356,961 |  |  | $ | 309,601 |
Denominator for basic earnings per share |  | 92,631 |  |  | 92,110 |  |  | 92,604 |  |  | 91,923 |
Dilutive securities |  | 2,676 |  |  | 2,047 |  |  | 2,600 |  |  | 2,146 |
Denominator for diluted earnings per share |  | 95,307 |  |  | 94,157 |  |  | 95,204 |  |  | 94,069 |
Basic earnings per share |  | $ | 1.40 |  |  | $ | 1.27 |  |  | $ | 3.85 |  |  | $ | 3.37 |
Diluted earnings per share |  | $ | 1.36 |  |  | $ | 1.24 |  |  | $ | 3.75 |  |  | $ | 3.29 |

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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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