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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Data [Abstract] |
Quarterly Financial Data (Unaudited) | Quarterly Financial Data (Unaudited)
|  | For the Three Months Ended
2020 |  | March 31 |  | June 30 |  | September 30 |  | December 31
Revenues |  | $ | 414,762 |  |  | $ | 400,646 |  |  | $ | 424,927 |  |  | $ | 443,723 |
Income before income taxes |  | $ | 139,197 |  |  | $ | 131,710 |  |  | $ | 141,274 |  |  | $ | 156,513 |
Net income |  | $ | 109,242 |  |  | $ | 101,066 |  |  | $ | 111,096 |  |  | $ | 125,882 |
Basic earnings per share |  | $ | 0.73 |  |  | $ | 0.69 |  |  | $ | 0.76 |  |  | $ | 0.87 |
Diluted earnings per share (1) |  | $ | 0.72 |  |  | $ | 0.68 |  |  | $ | 0.75 |  |  | $ | 0.86 |
Effective income tax rate |  | 21.5 | % |  | 23.3 | % |  | 21.4 | % |  | 19.6 | %
|  | 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 | %

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- References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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