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Segment Information - Adjusted EBITDA (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting [Abstract] |  |  |  |  |  |  |  |
Revenue before reimbursements (net revenue) | $ 278,559,000 |  |  | $ 263,160,000 |  |  | $ 822,382,000 | $ 773,702,000
Net income | 14,829,000 | $ (5,157,000) | $ 14,032,000 | 14,987,000 | $ 8,982,000 | $ 15,586,000 | 23,704,000 | 39,555,000
Interest, net | (2,570,000) |  |  | (2,505,000) |  |  | (9,268,000) | (7,667,000)
Other, net | 555,000 |  |  | 649,000 |  |  | (3,013,000) | (2,537,000)
Provision for income taxes | 6,268,000 |  |  | 9,006,000 |  |  | 19,750,000 | 24,142,000
Operating income | 19,082,000 |  |  | 22,137,000 |  |  | 31,173,000 | 53,493,000
Depreciation | 2,997,000 |  |  | 2,387,000 |  |  | 7,480,000 | 6,563,000
Intangible amortization | 1,953,000 |  |  | 2,353,000 |  |  | 6,170,000 | 6,869,000
Earnout accretion | 478,000 |  |  | 455,000 |  |  | 1,413,000 | 1,097,000
Earnout fair value adjustments | 0 |  |  | 0 |  |  | 1,211,000 | 0
Acquisition contingent consideration | 2,947,000 |  |  | 3,268,000 |  |  | 8,220,000 | 8,711,000
Deferred compensation plan | 2,958,000 |  |  | (1,427,000) |  |  | 6,264,000 | 2,309,000
Reorganization costs | 0 |  |  | 176,000 |  |  | 0 | 3,572,000
Impairment charges | 0 |  |  | 0 |  |  | 16,224,000 | 7,246,000
Restructuring charges | 0 |  |  | 0 |  |  | 6,939,000 | 0
Total adjustments | 11,333,000 |  |  | 7,212,000 |  |  | 53,921,000 | 36,367,000
Adjusted EBITDA | $ 30,415,000 |  |  | $ 29,349,000 |  |  | $ 85,094,000 | $ 89,860,000
Adjusted EBITDA margin | 10.90% |  |  | 11.20% |  |  | 10.30% | 11.60%

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