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Accounts Payable and Accrued Expenses (Tables)
12 Months Ended
Dec. 31, 2014
Payables and Accruals [Abstract]  
Schedule of Accounts Payable and Accrued Expenses

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

 

     December 31,  
     2014      2013  

Accounts payable

   $ 32,783       $ 18,605   

Accrued salaries and bonuses

     231,390         189,439   

Accrued payroll taxes and benefits

     49,858         43,403   

Accrued professional liability

     19,718         19,324   

Accrued contingent consideration

     17,010         19,833   

Other accrued expenses

     29,899         18,150   
  

 

 

    

 

 

 
$ 380,658    $ 308,754