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1. NATURE OF BUSINESS AND BASIS OF PRESENTATION (Tables)
 3 Months Ended
Mar. 31, 2013
Nature Of Business And Basis Of Presentation Tables  
Service fee revenue
   2013   2012 
         
Commercial Insurance  $97,685   $91,745 
Managed Care Capitated Payors   22,583    21,626 
Medicare   35,713    34,077 
Medicaid   5,777    5,570 
Other   18,004    15,483 
Service fee revenue, net of contractual allowances and discounts   179,762    168,500 
           
Provision for bad debts   (6,822)   (6,484)
Net service fee revenue  $172,940   $162,016