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Accounts Payable and Accrued Expenses: (Tables)
12 Months Ended
Dec. 31, 2012
Schedule of Accounts Payable and Accrued Expenses

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

 

     December 31,  
     2012      2011  

Accounts payable

   $ 13,812       $ 12,264   

Accrued salaries and bonuses

     160,495         147,613   

Accrued payroll taxes and benefits

     36,176         29,443   

Accrued professional liability risks

     17,466         13,218   

Accrued contingent consideration

     16,109         12,089   

Accrual for uncertain tax positions

     —           3,242   

Other accrued expenses

     11,603         16,666   
  

 

 

    

 

 

 
   $ 255,661       $ 234,535