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Business Segments | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Segment Reporting Disclosure [Text Block] | Business Segments On Assignment provides services through two operating segments, the Apex Segment and the Oxford Segment, with each addressing different sectors of the professional staffing and IT services market with distinct go-to-market strategies attuned to those sectors. The Apex Segment provides a broad spectrum of technical, digital, creative and scientific professionals for contract, contract-to-hire and permanent placement positions to Fortune 1000 and mid-market clients across the United States and Canada. The businesses in this segment include Apex Systems, Apex Life Sciences and Creative Circle. The Oxford Segment provides specialized staffing and permanent placement services in select skill and geographic markets. The businesses in this segment include Oxford, CyberCoders and Life Sciences Europe. The Company’s management evaluates the performance of each segment primarily based on revenues, gross profit and operating income. The information in the following tables is derived directly from the segments’ internal financial reporting used for corporate management purposes. The Company's management does not evaluate, manage or measure performance of segments using asset information and such information is not readily available. Accordingly, assets by reportable segment are not disclosed. The following tables present revenues, gross profit, operating income and amortization by reportable segment (in thousands):
| Year ended December 31, 2017
| Apex |  | Oxford |  | Corporate(1) |  | Total
Revenues | $ | 2,037,154 |  |  | $ | 588,770 |  |  | $ | — |  |  | $ | 2,625,924 |
Gross profit | 606,294 |  |  | 243,779 |  |  | — |  |  | 850,073 |
Operating income | 222,010 |  |  | 53,787 |  |  | (51,061 | ) |  | 224,736 |
Amortization | 29,361 |  |  | 4,083 |  |  | — |  |  | 33,444 |
| Year ended December 31, 2016
| Apex |  | Oxford |  | Corporate(1) |  | Total
Revenues | $ | 1,836,488 |  |  | $ | 603,925 |  |  | $ | — |  |  | $ | 2,440,413 |
Gross profit | 548,421 |  |  | 246,762 |  |  | — |  |  | 795,183 |
Operating income | 195,133 |  |  | 51,294 |  |  | (56,701 | ) |  | 189,726 |
Amortization | 34,359 |  |  | 5,269 |  |  | — |  |  | 39,628 |
| Year ended December 31, 2015
| Apex |  | Oxford |  | Corporate(1) |  | Total
Revenues | $ | 1,493,608 |  |  | $ | 571,400 |  |  | $ | — |  |  | $ | 2,065,008 |
Gross profit | 439,586 |  |  | 239,159 |  |  | — |  |  | 678,745 |
Operating income | 151,450 |  |  | 59,059 |  |  | (58,401 | ) |  | 152,108 |
Amortization | 28,371 |  |  | 6,096 |  |  | — |  |  | 34,467 |
(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.
The following table presents revenues by type (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Revenues: |  |  |  |  |  |
Assignment |  | $ | 2,496,314 |  |  | $ | 2,312,271 |  |  | $ | 1,947,001 |
Permanent placement |  | 129,610 |  |  | 128,142 |  |  | 118,007 |
|  | $ | 2,625,924 |  |  | $ | 2,440,413 |  |  | $ | 2,065,008 |
The Company operates internationally, with operations in the United States, Europe and Canada. The following table presents revenues by geographic location (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Revenues: |  |  |  |  |  |
Domestic |  | $ | 2,494,446 |  |  | $ | 2,324,713 |  |  | $ | 1,972,888 |
Foreign |  | 131,478 |  |  | 115,700 |  |  | 92,120 |
|  | $ | 2,625,924 |  |  | $ | 2,440,413 |  |  | $ | 2,065,008 |
The following table presents long-lived assets by geographic location (in thousands):
|  | December 31,
|  | 2017 |  | 2016
Long-lived assets: |  |  |  |
Domestic |  | $ | 56,137 |  |  | $ | 55,801 |
Foreign |  | 1,859 |  |  | 1,141 |
|  | $ | 57,996 |  |  | $ | 56,942 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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