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Accounts Payable and Accrued Expenses (Tables)
3 Months Ended
Mar. 31, 2019
Payables and Accruals [Abstract]  
Schedule of Accounts Payable and Accrued Expenses
Accounts payable and accrued expenses consist of the following (in thousands):
 
  
March 31, 2019
  
December 31, 2018
 
Accounts payable
 $32,149  $31,059 
Accrued salaries and bonuses
  105,565   242,888 
Accrued payroll taxes and benefits
  52,385   78,415 
Accrued professional liabilities
  41,198   34,931 
Accrued contingent consideration
  15,069   18,760 
Accrued interest
  26,516   9,477 
Other accrued expenses
  40,075   33,037 
  
 
 
  
 
 
 
  $312,957  $448,567