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Accounts Payable and Accrued Expenses
 12 Months Ended
Dec. 31, 2017
Payables and Accruals [Abstract]  
Accounts Payable and Accrued Expenses

8.    Accounts Payable and Accrued Expenses:

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

 

     December 31,  
     2017      2016  

Accounts payable

    $ 34,632      $ 28,474  

Accrued salaries and bonuses

      225,429        220,635  

Accrued payroll taxes and benefits

      75,672        67,830  

Accrued professional liabilities

      37,912        28,972  

Accrued contingent consideration

      6,259        6,566  

Accrued interest

      4,495        4,511  

Other accrued expenses

      53,618        50,950  
  

 

 

     

 

 

  
   $ 438,017      $ 407,938