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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Net service revenues | $ 1,516,385 | $ 1,457,054 | $ 2,984,915 | $ 2,852,387
Operating income | 159,402 | 149,511 | 305,631 | 283,878
Amortization of intangible assets | 341 | 442 | 683 | 905
Interest income, net | (1,042) | (1,006) | (2,538) | (1,741)
Income before income taxes | 160,103 | 150,075 | 307,486 | 284,714
Operating Segments | Temporary and consultant staffing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net service revenues | 1,102,712 | 1,087,974 | 2,187,339 | 2,154,262
Operating income | 105,238 | 103,570 | 211,256 | 200,293
Operating Segments | Permanent placement staffing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net service revenues | 140,894 | 135,038 | 272,456 | 256,438
Operating income | 25,344 | 27,436 | 46,901 | 49,815
Operating Segments | Risk consulting and internal audit services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net service revenues | 272,779 | 234,042 | 525,120 | 441,687
Operating income | $ 28,820 | $ 18,505 | $ 47,474 | $ 33,770

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