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Segment Reporting - Revenues and Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization for Reportable Segments (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] |  |  |  |
Revenues | $ 702,228 | $ 622,249 | $ 2,099,991 | $ 1,834,694
Adjusted Segment EBITDA | 125,496 | 115,892 | 371,836 | 327,396
Corporate Finance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 250,321 | 236,615 | 707,495 | 690,375
Adjusted Segment EBITDA | 55,635 | 56,215 | 133,248 | 181,425
FLC |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 145,264 | 119,104 | 446,831 | 373,082
Adjusted Segment EBITDA | 16,620 | 13,591 | 64,054 | 25,752
Economic Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 172,543 | 154,978 | 525,122 | 438,609
Adjusted Segment EBITDA | 29,917 | 25,720 | 87,195 | 60,124
Technology |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 64,657 | 58,585 | 222,762 | 164,392
Adjusted Segment EBITDA | 7,835 | 11,939 | 47,951 | 32,858
Strategic Communications |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 69,443 | 52,967 | 197,781 | 168,236
Adjusted Segment EBITDA | $ 15,489 | $ 8,427 | $ 39,388 | $ 27,237

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