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Quarterly Financial Information (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
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 2016 and 2015.
| Quarters Ended
| 2016 |  | 2015
| Dec. 31 |  | Sept. 30 |  | June 30 |  | Mar. 31 |  | Dec. 31(b) |  | Sept. 30 |  | June 30 |  | Mar. 31
Revenues | $ | 193,281 |  |  | $ | 194,497 |  |  | $ | 188,972 |  |  | $ | 179,293 |  |  | $ | 158,916 |  |  | $ | 150,845 |  |  | $ | 146,295 |  |  | $ | 134,966 |
Gross profit | 92,817 |  |  | 93,480 |  |  | 86,936 |  |  | 82,118 |  |  | 73,222 |  |  | 71,833 |  |  | 68,253 |  |  | 63,879 |
Income before income taxes (a) | 35,119 |  |  | 36,419 |  |  | 30,195 |  |  | 27,574 |  |  | 19,540 |  |  | 31,744 |  |  | 29,781 |  |  | 27,359 |
Net income (a) | 31,196 |  |  | 35,430 |  |  | 25,007 |  |  | 18,224 |  |  | 8,618 |  |  | 20,142 |  |  | 18,836 |  |  | 17,273 |
Earnings per diluted share | $ | 0.80 |  |  | $ | 0.91 |  |  | $ | 0.65 |  |  | $ | 0.47 |  |  | $ | 0.23 |  |  | $ | 0.55 |  |  | $ | 0.52 |  |  | $ | 0.48 |
Shares used in computing diluted earnings per share (a) | 38,975 |  |  | 39,062 |  |  | 38,738 |  |  | 39,071 |  |  | 37,864 |  |  | 36,349 |  |  | 36,097 |  |  | 35,895 |
(a) | During fourth quarter 2016, we adopted ASU No. 2016-09 requiring the recognition of excess tax benefits as a component of income tax expense; these benefits were historically recognized in equity. As the standard required a prospective method of adoption, our fourth quarter 2016 net income includes a $9.2 million income tax benefit due to the adoption that did not occur in the comparable prior year periods presented above. The three months ended March 31, June 30, and September 30, 2016, respectively, have been adjusted for the newly adopted standard. Refer to Note 1 "Summary of Significant Accounting Policies" for further discussion of this new accounting standard.
(b) | Operating results for the three months ended December 31, 2015, include $5.9 million for financial advisory, legal, accounting, due diligence, valuation and other expenses necessary to complete the NWS acquisition as well as $3.5 million amortization expense related to NWS acquisition intangibles.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and 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=51825399&loc=d3e1280-108306 + Details
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