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Segment Reporting (Segment Reporting Information) (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($)
Revenues: |  |  |
Revenues |  | $ 685,173 | $ 626,528
Revenue as Percentage of Consolidated Revenue |  | 100.00% | 100.00%
Gross Profit: |  |  |
Total Gross Profit |  | $ 217,737 | $ 198,144
Operating Income (Loss): |  |  |
Total Operating Income |  | 45,692 | 43,608
Amortization of Intangible Assets |  | $ 7,601 | 8,464
Reportable segments (in number of segments) | segment |  | 2 |
Apex |  |  |
Revenues: |  |  |
Revenues |  | $ 538,504 | 482,515
Gross Profit: |  |  |
Total Gross Profit |  | 158,648 | 139,919
Operating Income (Loss): |  |  |
Total Operating Income |  | 56,264 | 46,893
Amortization of Intangible Assets |  | 6,546 | 7,527
Oxford |  |  |
Revenues: |  |  |
Revenues |  | 146,669 | 144,013
Gross Profit: |  |  |
Total Gross Profit |  | 59,089 | 58,225
Operating Income (Loss): |  |  |
Total Operating Income |  | 9,826 | 8,663
Amortization of Intangible Assets |  | 1,055 | 937
Corporate Segment [Member] |  |  |
Operating Income (Loss): |  |  |
Total Operating Income | [1] | (20,398) | (11,948)
Amortization of Intangible Assets |  | 0 | 0
Assignment [Member] |  |  |
Revenues: |  |  |
Revenues |  | 650,256 | 594,515
Assignment [Member] | Apex |  |  |
Revenues: |  |  |
Revenues |  | 524,854 | 471,266
Assignment [Member] | Oxford |  |  |
Revenues: |  |  |
Revenues |  | 125,402 | 123,249
PermanentPlacement [Member] |  |  |
Revenues: |  |  |
Revenues |  | 34,917 | 32,013
PermanentPlacement [Member] | Apex |  |  |
Revenues: |  |  |
Revenues |  | 13,650 | 11,249
PermanentPlacement [Member] | Oxford |  |  |
Revenues: |  |  |
Revenues |  | $ 21,267 | $ 20,764
[1] | 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. Corporate expenses for the three months ended March 31, 2018 included $9.8 million of one-time expenses related to the acquisition of ECS Federal, LLC, which closed on April 2, 2018, see "Note 12. Subsequent Events."

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