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Share-based awards - Schedule of Non-Cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total $ 12,294 $ 13,181
Direct costs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total 5,381 6,721
Selling, general and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total $ 6,913 $ 6,460