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Business Segments - Identifiable Assets by Business Segment (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Goodwill | $ 209,793 | $ 208,579 | $ 199,488
Temporary and consultant staffing |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill |  |  | 133,964
Permanent placement staffing |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill |  |  | 26,450
Risk consulting and internal audit services |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill |  |  | 39,074
Operating segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Accounts receivable | 736,361 | 739,727 | 688,220
Goodwill | 209,793 | 208,579 | 199,488
Operating segments | Temporary and consultant staffing |  |  |
Segment Reporting Information [Line Items] |  |  |
Accounts receivable | 403,074 | 425,179 | 403,615
Goodwill | 133,875 | 133,173 | 133,964
Operating segments | Permanent placement staffing |  |  |
Segment Reporting Information [Line Items] |  |  |
Accounts receivable | 129,506 | 121,670 | 115,563
Goodwill | 26,015 | 26,251 | 26,450
Operating segments | Risk consulting and internal audit services |  |  |
Segment Reporting Information [Line Items] |  |  |
Accounts receivable | 203,781 | 192,878 | 169,042
Goodwill | $ 49,903 | $ 49,155 | $ 39,074

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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