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QUARTERLY FINANCIAL INFORMATION (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
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 2020 and 2019:
| Quarters Ended
| 2020 |  | 2019
| Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31 |  | Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31
Revenues | $ | 283,285 |  |  | $ | 285,746 |  |  | $ | 271,091 |  |  | $ | 276,541 |  |  | $ | 288,837 |  |  | $ | 275,400 |  |  | $ | 275,124 |  |  | $ | 247,066 |
Gross profit | 138,669 |  |  | 143,509 |  |  | 131,203 |  |  | 129,131 |  |  | 142,275 |  |  | 130,717 |  |  | 127,860 |  |  | 116,048 |
Income before income taxes | 48,412 |  |  | 49,936 |  |  | 41,811 |  |  | 34,883 |  |  | 47,790 |  |  | 40,552 |  |  | 36,419 |  |  | 35,077 |
Net income | 54,094 |  |  | 39,284 |  |  | 53,892 |  |  | 47,550 |  |  | 46,790 |  |  | 40,390 |  |  | 31,999 |  |  | 27,348 |
Earnings per diluted share | $ | 1.29 |  |  | $ | 0.94 |  |  | $ | 1.30 |  |  | $ | 1.16 |  |  | $ | 1.15 |  |  | $ | 1.00 |  |  | $ | 0.80 |  |  | $ | 0.69 |
Shares used in computing diluted earnings per share | 41,925 |  |  | 41,606 |  |  | 41,416 |  |  | 41,144 |  |  | 40,736 |  |  | 40,280 |  |  | 39,813 |  |  | 39,585 |

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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=121640914&loc=d3e1280-108306 + Details
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