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Unaudited Quarterly Financial Results (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Quarterly Financial Information |
|  | Quarter Ended |  | Year Ended Dec. 31,
2017 |  | Mar. 31, |  | June 30, |  | Sept. 30, |  | Dec. 31,(1) |
Revenues |  | $ | 626,528 |  |  | $ | 653,313 |  |  | $ | 667,048 |  |  | $ | 679,035 |  |  | $ | 2,625,924 |
Gross profit |  | 198,144 |  |  | 212,937 |  |  | 218,315 |  |  | 220,677 |  |  | 850,073 |
Income from continuing operations |  | 22,382 |  |  | 33,236 |  |  | 34,879 |  |  | 67,377 |  |  | 157,874 |
Income (loss) from discontinued operations, net of income taxes |  | 9 |  |  | (139 | ) |  | (23 | ) |  | (46 | ) |  | (199 | )
Net income |  | $ | 22,391 |  |  | $ | 33,097 |  |  | $ | 34,856 |  |  | $ | 67,331 |  |  | $ | 157,675 |
Per share income from continuing operations and net income: |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.43 |  |  | $ | 0.63 |  |  | $ | 0.66 |  |  | $ | 1.29 |  |  | $ | 3.01 |
Diluted |  | $ | 0.42 |  |  | $ | 0.62 |  |  | $ | 0.66 |  |  | $ | 1.28 |  |  | $ | 2.97 |
|  | Quarter Ended |  | Year Ended Dec. 31,
2016 |  | Mar. 31, |  | June 30, |  | Sept. 30, |  | Dec. 31,(2) |
Revenues |  | $ | 582,040 |  |  | $ | 608,088 |  |  | $ | 629,401 |  |  | $ | 620,884 |  |  | $ | 2,440,413 |
Gross profit |  | 187,782 |  |  | 202,086 |  |  | 207,120 |  |  | 198,195 |  |  | 795,183 |
Income from continuing operations |  | 17,348 |  |  | 26,013 |  |  | 29,775 |  |  | 24,060 |  |  | 97,196 |
Income (loss) from discontinued operations, net of income taxes |  | 53 |  |  | (9 | ) |  | (7 | ) |  | (32 | ) |  | 5 |
Net income |  | $ | 17,401 |  |  | $ | 26,004 |  |  | $ | 29,768 |  |  | $ | 24,028 |  |  | $ | 97,201 |
Per share income from continuing operations and net income: |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.33 |  |  | $ | 0.49 |  |  | $ | 0.56 |  |  | $ | 0.45 |  |  | $ | 1.83 |
Diluted |  | $ | 0.32 |  |  | $ | 0.48 |  |  | $ | 0.55 |  |  | $ | 0.45 |  |  | $ | 1.81 |
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(1) | On December 22, 2017, the U.S. government enacted comprehensive tax legislation, the TCJA. In the fourth quarter of 2017, the Company recorded an estimated net tax benefit of $31.4 million for the impact of the TCJA, which is included in the provision for income taxes in the consolidated statement of operations and comprehensive income, see “Note 9. Income Taxes”.
(2) | The fourth quarter of 2016 included out-of-period adjustments of $5.6 million for costs of services that were understated in prior quarters. As a result, costs of services for the fourth quarter of 2016 were overstated by $5.6 million and gross profit, net income and diluted earnings per common share were understated by $5.6 million, $3.4 million and $0.06, respectively.

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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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