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Quarterly Financial Information (unaudited) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information (unaudited) | QUARTERLY FINANCIAL INFORMATION (unaudited) 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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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