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Unaudited Quarterly Financial Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 679,035 |  | $ 667,048 | $ 653,313 | $ 626,528 | $ 620,884 |  | $ 629,401 | $ 608,088 | $ 582,040 | $ 2,625,924 | $ 2,440,413 | $ 2,065,008
Gross profit | 220,677 |  | 218,315 | 212,937 | 198,144 | 198,195 | [1] | 207,120 | 202,086 | 187,782 | 850,073 | 795,183 | 678,745
Income from continuing operations | 67,377 | [2] | 34,879 | 33,236 | 22,382 | 24,060 | [1] | 29,775 | 26,013 | 17,348 | 157,874 | 97,196 | 71,422
Net income | $ 67,331 |  | $ 34,856 | $ 33,097 | $ 22,391 | $ 24,028 | [1] | $ 29,768 | $ 26,004 | $ 17,401 | $ 157,675 | $ 97,201 | $ 97,650
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ 1.29 |  | $ 0.66 | $ 0.63 | $ 0.43 | $ 0.45 | [1] | $ 0.56 | $ 0.49 | $ 0.33 | $ 3.01 | $ 1.83 | $ 1.37
Discontinued operations |  |  |  |  |  |  |  |  |  |  | 0.00 | 0.00 | 0.50
Net income |  |  |  |  |  |  |  |  |  |  | 3.01 | 1.83 | 1.87
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ 1.28 |  | $ 0.66 | $ 0.62 | $ 0.42 | $ 0.45 | [1] | $ 0.55 | $ 0.48 | $ 0.32 | 2.97 | 1.81 | 1.35
Discontinued operations |  |  |  |  |  |  |  |  |  |  | 0.00 | 0.00 | 0.49
Net income |  |  |  |  |  |  |  |  |  |  | $ 2.97 | $ 1.81 | $ 1.84
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions |  |  |  |  |  |  |  |  |  |  | $ (31,420) | $ 0 | $ 0
Income from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  |  |  | (199) | 5 | $ 525
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |
Income from discontinued operations, net of income taxes | $ (46) |  | $ (23) | $ (139) | $ 9 | $ (32) |  | $ (7) | $ (9) | $ 53 | $ (199) | $ 5 |
[1] | 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.
[2] | 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”.

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