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Business Segments - Reconciliation of Revenue and Operating Income by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Service revenues | $ 1,108,326 | $ 1,516,385 | $ 2,615,017 | $ 2,984,915
Operating income | 58,249 | 159,402 | 189,393 | 305,631
Amortization of intangible assets | 330 | 341 | 668 | 683
Interest income, net | (105) | (1,042) | (1,062) | (2,538)
Income before income taxes | 58,024 | 160,103 | 189,787 | 307,486
Operating Segments | Temporary and consultant staffing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Service revenues | 753,386 | 1,102,712 | 1,845,506 | 2,187,339
Operating income | 28,390 | 105,238 | 122,154 | 211,256
Operating Segments | Permanent placement staffing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Service revenues | 71,030 | 140,894 | 191,519 | 272,456
Operating income | (248) | 25,344 | 10,663 | 46,901
Operating Segments | Risk consulting and internal audit services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Service revenues | 283,910 | 272,779 | 577,992 | 525,120
Operating income | $ 30,107 | $ 28,820 | $ 56,576 | $ 47,474

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