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Accounts Payable and Accrued Expenses (Tables)
12 Months Ended
Dec. 31, 2013
Payables And Accruals [Abstract]  
Schedule of Accounts Payable and Accrued Expenses

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

 

     December 31,  
     2013      2012  

Accounts payable

   $ 18,605       $ 13,812   

Accrued salaries and bonuses

     189,439         160,495   

Accrued payroll taxes and benefits

     43,403         36,176   

Accrued professional liability risks

     19,324         17,466   

Accrued contingent consideration

     19,833         16,109   

Other accrued expenses

     18,150         11,603   
  

 

 

    

 

 

 
   $ 308,754       $ 255,661