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ACCRUED EXPENSES
 12 Months Ended
Dec. 31, 2023
Payables and Accruals [Abstract]  
ACCRUED EXPENSES ACCRUED EXPENSES
Accrued expenses consisted of the following at December 31 (in thousands):
20232022
Employee compensation and benefits$75,822 $71,197 
Project related reimbursable expenses205,864 128,416 
Other11,275 10,512 
Total accrued expenses$292,961 $210,125