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Segment Information - Adjusted EBITDA (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting [Abstract] |  |  |
Revenue before reimbursements (net revenue) | $ 1,098,573 | $ 1,026,864 | $ 1,073,464
Net income | 8,728 | 54,410 | 79,486
Interest, net | (14,422) | (11,617) | (5,337)
Other, net | (8,702) | (1,697) | 2,367
Provision for income taxes | 21,924 | 34,261 | 35,750
Operating income | 7,528 | 75,357 | 112,266
Depreciation | 10,782 | 9,113 | 7,394
Intangible amortization | 8,075 | 9,395 | 3,209
Earnout accretion | 1,926 | 1,554 | 820
Earnout fair value adjustments | 438 | 0 | (464)
Acquisition contingent consideration | 10,815 | 11,934 | 3,885
Deferred compensation plan | 5,257 | 6,132 | (6,232)
Reorganization costs | 0 | 4,886 | 0
Impairment charges | 59,478 | 7,246 | 0
Restructuring charges | 6,939 | 0 | 0
Total adjustments | 103,710 | 50,260 | 8,612
Adjusted EBITDA | $ 111,238 | $ 125,617 | $ 120,878
Adjusted EBITDA margin | 10.10% | 12.20% | 11.30%

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