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Segment and Geographic Information - Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 1,340,970	$ 1,316,919	$ 1,231,226
Service
Segment Reporting Information [Line Items]
Revenues	1,292,510	1,267,131	1,189,482
Reimbursements
Segment Reporting Information [Line Items]
Revenues	$ 48,460	$ 49,788	$ 41,744

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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