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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Data [Abstract] |
Schedule of Quarterly Financial Data |
|  | For the Three Months Ended
2019 |  | March 31 |  | June 30 |  | September 30 |  | December 31
Revenues |  | $ | 400,820 |  |  | $ | 409,586 |  |  | $ | 416,254 |  |  | $ | 423,225 |
Income before income taxes |  | $ | 146,257 |  |  | $ | 162,346 |  |  | $ | 162,870 |  |  | $ | 159,968 |
Net income |  | $ | 113,981 |  |  | $ | 126,540 |  |  | $ | 132,168 |  |  | $ | 128,737 |
Basic earnings per share |  | $ | 0.74 |  |  | $ | 0.83 |  |  | $ | 0.88 |  |  | $ | 0.86 |
Diluted earnings per share (1) |  | $ | 0.73 |  |  | $ | 0.82 |  |  | $ | 0.86 |  |  | $ | 0.84 |
Effective income tax rate |  | 22.1 | % |  | 22.1 | % |  | 18.9 | % |  | 19.5 | %
(1) 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.
|  | 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 | %

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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=118952077&loc=d3e1280-108306 + Details
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