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Business Segments - Identifiable Assets by Business Segment (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Goodwill | $ 208,579 | $ 199,488 | $ 200,833
Temporary and consultant staffing |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 133,173 | 133,964 | 134,692
Permanent placement staffing |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 26,251 | 26,450 | 26,574
Risk consulting and internal audit services |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 49,155 | 39,074 | 39,567
Operating segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Accounts receivable | 739,727 | 688,220 | 579,166
Goodwill | 208,579 | 199,488 | 200,833
Operating segments | Temporary and consultant staffing |  |  |
Segment Reporting Information [Line Items] |  |  |
Accounts receivable | 425,179 | 403,615 | 349,364
Goodwill | 133,173 | 133,964 | 134,692
Operating segments | Permanent placement staffing |  |  |
Segment Reporting Information [Line Items] |  |  |
Accounts receivable | 121,670 | 115,563 | 100,550
Goodwill | 26,251 | 26,450 | 26,574
Operating segments | Risk consulting and internal audit services |  |  |
Segment Reporting Information [Line Items] |  |  |
Accounts receivable | 192,878 | 169,042 | 129,252
Goodwill | $ 49,155 | $ 39,074 | $ 39,567

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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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