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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 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 six months ended June 30 (in thousands, except per share data) follows:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Net income |  | $ | 114,185 |  |  | $ | 98,678 |  |  | $ | 224,157 |  |  | $ | 192,831 |
Denominator for basic earnings per share |  | 92,665 |  |  | 91,904 |  |  | 92,591 |  |  | 91,828 |
Dilutive securities |  | 1,884 |  |  | 2,146 |  |  | 1,846 |  |  | 2,164 |
Denominator for diluted earnings per share |  | 94,549 |  |  | 94,050 |  |  | 94,437 |  |  | 93,992 |
Basic earnings per share |  | $ | 1.23 |  |  | $ | 1.07 |  |  | $ | 2.42 |  |  | $ | 2.10 |
Diluted earnings per share |  | $ | 1.21 |  |  | $ | 1.05 |  |  | $ | 2.37 |  |  | $ | 2.05 |

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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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