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Business Segments Segment Reporting Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
Operating Income |  |  |  |  |  |  |  |  |  | 224,736 | 189,726 |  | 152,108 |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  | $ 33,444 | 39,628 |  | 34,467 |
Reportable segments (in number of segments) | property |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Apex |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 2,037,154 | 1,836,488 |  | 1,493,608 |
Gross profit |  |  |  |  |  |  |  |  |  | 606,294 | 548,421 |  | 439,586 |
Operating Income |  |  |  |  |  |  |  |  |  | 222,010 | 195,133 |  | 151,450 |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  | 29,361 | 34,359 |  | 28,371 |
Oxford |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 588,770 | 603,925 |  | 571,400 |
Gross profit |  |  |  |  |  |  |  |  |  | 243,779 | 246,762 |  | 239,159 |
Operating Income |  |  |  |  |  |  |  |  |  | 53,787 | 51,294 |  | 59,059 |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  | 4,083 | 5,269 |  | 6,096 |
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  |  | (51,061) | (56,701) | [2] | (58,401) | [2]
Amortization of intangible assets |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 |
Assignment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 2,496,314 | 2,312,271 |  | 1,947,001 |
PermanentPlacement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 129,610 | $ 128,142 |  | $ 118,007 |
[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] | Corporate expenses primarily consist of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses and depreciation expense for corporate assets.

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