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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
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 years ended December 31 (in thousands, except per share data) follows:
|  | 2018 |  | 2017 |  | 2016
Net income |  | $ | 811,483 |  |  | $ | 740,200 |  |  | $ | 452,385 |
Denominator for basic earnings per share |  | 88,750 |  |  | 91,129 |  |  | 92,597 |
Dilutive securities |  | 3,401 |  |  | 2,465 |  |  | 2,616 |
Denominator for diluted earnings per share |  | 92,151 |  |  | 93,594 |  |  | 95,213 |
Basic earnings per share |  | $ | 9.14 |  |  | $ | 8.12 |  |  | $ | 4.89 |
Diluted earnings per share |  | 8.81 |  |  | 7.91 |  |  | 4.75 |

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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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