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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data [Abstract] |
Quarterly Financial Data |
|  | For the Three Months Ended
2018 |  | March 31 |  | June 30 |  | September 30 |  | December 31
Revenues |  | $ | 405,598 |  |  | $ | 404,830 |  |  | $ | 408,682 |  |  | $ | 405,057 |
Income before income taxes |  | $ | 158,758 |  |  | $ | 154,254 |  |  | $ | 157,595 |  |  | $ | 143,599 |
Net income |  | $ | 139,838 |  |  | $ | 121,677 |  |  | $ | 128,319 |  |  | $ | 116,034 |
Basic earnings per share |  | $ | 0.89 |  |  | $ | 0.77 |  |  | $ | 0.82 |  |  | $ | 0.75 |
Diluted earnings per share |  | $ | 0.86 |  |  | $ | 0.75 |  |  | $ | 0.80 |  |  | $ | 0.73 |
Effective income tax rate |  | 11.9 | % |  | 21.1 | % |  | 18.6 | % |  | 19.2 | %
|  | For the Three Months Ended
2017 |  | March 31 |  | June 30 |  | September 30 |  | December 31(1)
Revenues |  | $ | 359,984 |  |  | $ | 372,331 |  |  | $ | 386,018 |  |  | $ | 408,219 |
Income before income taxes |  | $ | 128,660 |  |  | $ | 135,158 |  |  | $ | 140,769 |  |  | $ | 152,452 |
Net income |  | $ | 88,737 |  |  | $ | 91,769 |  |  | $ | 101,739 |  |  | $ | 122,144 |
Basic earnings per share |  | $ | 0.56 |  |  | $ | 0.58 |  |  | $ | 0.64 |  |  | $ | 0.78 |
Diluted earnings per share (2) |  | $ | 0.55 |  |  | $ | 0.57 |  |  | $ | 0.63 |  |  | $ | 0.75 |
Effective income tax rate |  | 31.0 | % |  | 32.1 | % |  | 27.7 | % |  | 19.9 | %
(1) During the fourth quarter 2017, the Company recognized an estimated net tax benefit of $12,410, or $0.08 diluted earnings per share, resulting from the impacts of the enactment of the Tax Act in December 2017 (See Note 11). (2) The sum of the individual quarterly earnings per share amounts may not agree with the annual earnings per share amount as each quarterly computation is based on the weighted average number of shares outstanding during that period.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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