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Segment Reporting (Tables) | 3 Months Ended
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Mar. 31, 2018
Segment Reporting Information [Line Items] |
Schedule of Segment Reporting Information, by Segment | The following tables present revenues, gross profit, operating income and amortization by reportable segment (in thousands):
| Three Months Ended
| March 31, 2018
| Apex |  | Oxford |  | Corporate(1) |  | Total
Revenues | $ | 538,504 |  |  | $ | 146,669 |  |  | $ | — |  |  | $ | 685,173 |
Gross profit | 158,648 |  |  | 59,089 |  |  | — |  |  | 217,737 |
Operating income | 56,264 |  |  | 9,826 |  |  | (20,398 | ) |  | 45,692 |
Amortization | 6,546 |  |  | 1,055 |  |  | — |  |  | 7,601 |
| Three Months Ended
| March 31, 20 17
| Apex |  | Oxford |  | Corporate(1) |  | Total
Revenues | $ | 482,515 |  |  | $ | 144,013 |  |  | $ | — |  |  | $ | 626,528 |
Gross profit | 139,919 |  |  | 58,225 |  |  | — |  |  | 198,144 |
Operating income | 46,893 |  |  | 8,663 |  |  | (11,948 | ) |  | 43,608 |
Amortization | 7,527 |  |  | 937 |  |  | — |  |  | 8,464 |
(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."
Disaggregation of Revenue [Table Text Block] | The following table presents our revenues disaggregated by type (in thousands):
| Three Months Ended |  | Three Months Ended
| March 31, 2018 |  | March 31, 20 17
| Apex |  | Oxford |  | Total |  | Apex |  | Oxford |  | Total
Revenues: |  |  |  |  |  |  |  |  |  |  |
Assignment | $ | 524,854 |  |  | $ | 125,402 |  |  | $ | 650,256 |  |  | $ | 471,266 |  |  | $ | 123,249 |  |  | $ | 594,515 |
Permanent placement | 13,650 |  |  | 21,267 |  |  | 34,917 |  |  | 11,249 |  |  | 20,764 |  |  | 32,013 |
| $ | 538,504 |  |  | $ | 146,669 |  |  | $ | 685,173 |  |  | $ | 482,515 |  |  | $ | 144,013 |  |  | $ | 626,528 |
Schedule of Revenue by Geographical Areas | The Company operates internationally, with operations mainly in the United States, Europe and Canada. The following table presents revenues by geographic location (in thousands):
|  | Three Months Ended
|  | March 31,
|  | 2018 |  | % |  | 2017 |  | %
Revenues: |  |  |  |  |  |  |  |
Domestic |  | $ | 647,267 |  |  | 94.5 | % |  | $ | 596,301 |  |  | 95.2 | %
Foreign |  | 37,906 |  |  | 5.5 | % |  | 30,227 |  |  | 4.8 | %
|  | $ | 685,173 |  |  | 100.0 | % |  | $ | 626,528 |  |  | 100.0 | %

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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