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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
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:
|  | 2015 |  |  | 2014 |  |  | 2013 |
Net income |  | $ | 362,431 |  |  | $ | 368,707 |  |  | $ | 284,501 |
Denominator for basic earnings per share |  |  | 92,023 |  |  |  | 84,317 |  |  |  | 81,793 |
Dilutive securities |  |  | 2,116 |  |  |  | 2,665 |  |  |  | 2,862 |
Denominator for diluted earnings per share |  |  | 94,139 |  |  |  | 86,982 |  |  |  | 84,655 |
Basic earnings per share |  | $ | 3.94 |  |  | $ | 4.37 |  |  | $ | 3.48 |
Diluted earnings per share |  |  | 3.85 |  |  |  | 4.24 |  |  |  | 3.36 |

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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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