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Goodwill | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill | Goodwill The following table sets forth the activity in goodwill from December 31, 2015, through December 31, 2017 (in thousands):
| Goodwill
| Temporary and consultant staffing |  | Permanent placement staffing |  | Risk consulting and internal audit services |  | Total
Balance as of December 31, 2015 | $ | 133,173 |  |  | $ | 26,251 |  |  | $ | 49,155 |  |  | $ | 208,579 |
Acquisitions | 1,248 |  |  | — |  |  | 299 |  |  | 1,547 |
Foreign currency translation adjustments | (546 | ) |  | (236 | ) |  | 449 |  |  | (333 | )
Balance as of December 31, 2016 | $ | 133,875 |  |  | $ | 26,015 |  |  | $ | 49,903 |  |  | $ | 209,793 |
Foreign currency translation adjustments | 613 |  |  | 144 |  |  | 335 |  |  | 1,092 |
Balance as of December 31, 2017 | $ | 134,488 |  |  | $ | 26,159 |  |  | $ | 50,238 |  |  | $ | 210,885 |

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- Definition The entire disclosure for goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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