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Quarterly Financial Information (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | The following table contains selected financial information from unaudited statements of income for each quarter of 2019 and 2018:
| Quarters Ended
| 2019 |  | 2018
| Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31 |  | Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31
Revenues | $ | 288,837 |  |  | $ | 275,400 |  |  | $ | 275,124 |  |  | $ | 247,066 |  |  | $ | 241,981 |  |  | $ | 236,067 |  |  | $ | 236,060 |  |  | $ | 221,174 |
Gross profit | 142,275 |  |  | 130,717 |  |  | 127,860 |  |  | 116,048 |  |  | 115,871 |  |  | 111,626 |  |  | 109,276 |  |  | 102,805 |
Income before income taxes | 47,790 |  |  | 40,552 |  |  | 36,419 |  |  | 35,077 |  |  | 40,107 |  |  | 38,626 |  |  | 37,700 |  |  | 39,437 |
Net income | 46,790 |  |  | 40,390 |  |  | 31,999 |  |  | 27,348 |  |  | 31,552 |  |  | 38,924 |  |  | 39,161 |  |  | 37,825 |
Earnings per diluted share | $ | 1.15 |  |  | $ | 1.00 |  |  | $ | 0.80 |  |  | $ | 0.69 |  |  | $ | 0.79 |  |  | $ | 0.96 |  |  | $ | 0.97 |  |  | $ | 0.95 |
Shares used in computing diluted earnings per share | 40,736 |  |  | 40,280 |  |  | 39,813 |  |  | 39,585 |  |  | 39,891 |  |  | 40,528 |  |  | 40,224 |  |  | 39,836 |

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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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