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Accounts Payable and Accrued Expenses (Tables)
3 Months Ended
Mar. 31, 2021
Payables and Accruals [Abstract]  
Schedule of Accounts Payable and Accrued Expenses
Accounts payable and accrued expenses consist of the following (in thousands):
 
    
March 31, 2021
    
December 31, 2020
 
Accounts payable
   $ 59,069      $ 59,771  
Accrued salaries and incentive compensation
     76,882        184,849  
Accrued payroll taxes and benefits
     46,913        43,945  
Accrued professional liabilities
     48,878        50,607  
Accrued interest
     13,751        32,721  
Other accrued expenses
     60,917        51,290  
    
 
 
    
 
 
 
     $ 306,410      $ 423,183