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Quarterly Financial Information (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
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 2017 and 2016:
| Quarters Ended
| 2017 |  | 2016
| Dec. 31 (a) |  | Sept. 30 |  | June 30 |  | Mar. 31 |  | Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31
Revenues | $ | 217,851 |  |  | $ | 214,146 |  |  | $ | 209,123 |  |  | $ | 199,542 |  |  | $ | 193,281 |  |  | $ | 194,497 |  |  | $ | 188,972 |  |  | $ | 179,293 |
Gross profit | 105,500 |  |  | 103,429 |  |  | 95,863 |  |  | 94,348 |  |  | 92,817 |  |  | 93,480 |  |  | 86,936 |  |  | 82,118 |
Income before income taxes | 45,173 |  |  | 43,522 |  |  | 36,974 |  |  | 35,959 |  |  | 35,119 |  |  | 36,419 |  |  | 30,195 |  |  | 27,574 |
Net income | 61,798 |  |  | 38,263 |  |  | 31,578 |  |  | 32,306 |  |  | 31,196 |  |  | 35,430 |  |  | 25,007 |  |  | 18,224 |
Earnings per diluted share | $ | 1.56 |  |  | $ | 0.97 |  |  | $ | 0.81 |  |  | $ | 0.83 |  |  | $ | 0.80 |  |  | $ | 0.91 |  |  | $ | 0.65 |  |  | $ | 0.47 |
Shares used in computing diluted earnings per share | 39,499 |  |  | 39,342 |  |  | 39,201 |  |  | 38,932 |  |  | 38,975 |  |  | 39,062 |  |  | 38,738 |  |  | 39,071 |
(a) Fourth quarter 2017 includes the significant impact of the enactment of the Tax Act. The most significant impact of the Tax Act to us is the reduction in the U.S. federal corporate income tax rate from 35% to 21%. The impact of the rate reduction on our 2017 income tax provision is a $21.6 million tax benefit due to the remeasurement of deferred tax assets and liabilities. Refer to Note 7 - "Income Tax" for further discussion on the impact the Tax Act.

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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