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Quarterly Financial Information (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Summary of Selected Financial Information | The following table contains selected financial information from unaudited statements of income for each quarter of 2015 and 2014.
|  | Quarters Ended |
|  | 2015 |  |  | 2014 |
|  | Dec. 31 (a) |  |  | Sept. 30 |  |  | June 30 |  |  | Mar. 31 |  |  | Dec. 31 |  |  | Sept. 30 |  |  | June 30 |  |  | Mar. 31 |
Revenues |  | $ | 158,916 |  |  | $ | 150,845 |  |  | $ | 146,295 |  |  | $ | 134,966 |  |  | $ | 127,440 |  |  | $ | 128,664 |  |  | $ | 124,371 |  |  | $ | 112,626 |
Gross profit |  |  | 73,222 |  |  |  | 71,833 |  |  |  | 68,253 |  |  |  | 63,879 |  |  |  | 60,491 |  |  |  | 61,792 |  |  |  | 58,558 |  |  |  | 52,530 |
Income before income taxes |  |  | 19,540 |  |  |  | 31,744 |  |  |  | 29,781 |  |  |  | 27,359 |  |  |  | 24,760 |  |  |  | 26,698 |  |  |  | 23,406 |  |  |  | 19,603 |
Net income |  |  | 8,618 |  |  |  | 20,142 |  |  |  | 18,836 |  |  |  | 17,273 |  |  |  | 15,317 |  |  |  | 17,000 |  |  |  | 14,740 |  |  |  | 11,883 |
Earnings per diluted share |  |  | 0.23 |  |  |  | 0.55 |  |  |  | 0.52 |  |  |  | 0.48 |  |  |  | 0.43 |  |  |  | 0.48 |  |  |  | 0.42 |  |  |  | 0.33 |
Shares used in computing diluted earnings per share |  |  | 37,864 |  |  |  | 36,349 |  |  |  | 36,097 |  |  |  | 35,895 |  |  |  | 35,661 |  |  |  | 35,284 |  |  |  | 35,161 |  |  |  | 35,500 |
(a) Operating results for the three months ended December 31, 2015, include $5.5 million for financial advisory, legal, accounting, due diligence, valuation and other services 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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