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Accounts Payable and Accrued Expenses
 12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Accounts Payable and Accrued Expenses
10.
Accounts Payable and Accrued Expenses:
Accounts payable and accrued expenses consist of the following (in thousands):
 
    
December 31,
  
    
2020
     
2019
  
Accounts payable
    $ 59,771      $ 35,410  
Accrued salaries and
incentive compensation
      184,849        193,631  
Accrued payroll taxes and benefits
      43,945        54,768  
Accrued professional liabilities
      50,607        44,699  
Accrued interest
      32,721        32,910  
Other accrued expenses
      51,264        49,219  
    
 
 
     
 
 
  
     $ 423,157      $ 410,637