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Business Segments - Reconciliation of Revenue and Operating Income by Reportable Segment to Consolidated Results (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues | $ 1,304,086 | $ 1,189,897 | $ 1,108,326 | $ 1,506,691 | $ 1,537,385 | $ 1,552,132 | $ 1,516,385 | $ 1,468,530 | $ 5,109,000 | $ 6,074,432 | $ 5,800,271
Segment income |  |  |  |  |  |  |  |  | 421,758 | 621,751 | 588,925
Amortization of intangible assets |  |  |  |  |  |  |  |  | 1,219 | 1,361 | 1,705
Interest income, net |  |  |  |  |  |  |  |  | (1,343) | (5,125) | (4,382)
Income before income taxes | $ 129,585 | $ 102,510 | $ 58,024 | $ 131,763 | $ 154,247 | $ 163,782 | $ 160,103 | $ 147,383 | 421,882 | 625,515 | 591,602
Temporary and consultant staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 3,477,335 | 4,412,125 | 4,330,566
Segment income |  |  |  |  |  |  |  |  | 237,279 | 410,153 | 404,800
Permanent placement staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 370,109 | 533,432 | 511,989
Segment income |  |  |  |  |  |  |  |  | 28,799 | 83,885 | 90,801
Risk consulting and internal audit services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 1,261,556 | 1,128,875 | 957,716
Segment income |  |  |  |  |  |  |  |  | $ 155,680 | $ 127,713 | $ 93,324

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