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Accounts Payable and Accrued Expenses (Tables)
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Schedule of Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consist of the following (in thousands):

 

     December 31,  
     2018      2017  

Accounts payable

   $ 31,059      $ 34,632  

Accrued salaries and bonuses

     249,834        225,429  

Accrued payroll taxes and benefits

     80,369        75,672  

Accrued professional liabilities

     34,931        37,912  

Accrued contingent consideration

     18,760        6,259  

Accrued interest

     9,477        4,495  

Other accrued expenses

     44,912        53,618  
  

 

 

    

 

 

 
   $ 469,342      $ 438,017