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Business Segments - Reconciliation of Revenue and Operating Income by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Service revenues | $ 1,712,566 | $ 1,189,897 | $ 4,691,527 | $ 3,804,914
Segment income | 227,992 | 102,642 | 583,217 | 292,035
Amortization of intangible assets | 572 | 334 | 1,724 | 1,002
Interest income, net | (238) | (202) | (145) | (1,264)
Income before income taxes | 227,658 | 102,510 | 581,638 | 292,297
Temporary and consultant staffing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Service revenues | 1,054,701 | 781,391 | 2,922,257 | 2,626,897
Segment income | 110,010 | 43,779 | 279,697 | 165,933
Permanent placement staffing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Service revenues | 156,444 | 87,203 | 411,788 | 278,722
Segment income | 31,030 | 10,128 | 79,264 | 20,791
Risk consulting and internal audit services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Service revenues | 501,421 | 321,303 | 1,357,482 | 899,295
Segment income | $ 86,952 | $ 48,735 | $ 224,256 | $ 105,311

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