Accounts Payable and Accrued Expenses (Tables)
 3 Months Ended
Mar. 31, 2015
Payables and Accruals [Abstract]  
Schedule of Accounts Payable and Accrued Expenses

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

 

     March 31, 2015      December 31, 2014  

Accounts payable

    $ 22,826       $ 32,783   

Accrued salaries and bonuses

      80,541         231,390   

Accrued payroll taxes and benefits

      40,379         49,858   

Accrued professional liabilities

      20,432         19,718   

Accrued contingent consideration

      18,264         17,010   

Other accrued expenses

      29,848         29,899   
  

 

 

     

 

 

  
$ 212,290    $ 380,658