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1. NATURE OF BUSINESS AND BASIS OF PRESENTATION (Tables)
 9 Months Ended
Sep. 30, 2012
Nature Of Business And Basis Of Presentation Tables  
Service fee revenue
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
    2012     2011     2012     2011  
Commercial Insurance/Managed Care Capitation   $ 111,963     $ 100,795     $ 340,750     $ 301,618  
Medicare     33,492       28,840       103,899       87,539  
Medicaid     5,663       4,759       16,250       14,734  
Workers Compensation/Personal Injury     7,281       6,201       21,174       19,501  
Other     8,629       7,985       25,200       22,640  
Service fee revenue, net of contractual allowances and discounts     167,027       148,579 #     507,273       446,032  
                                 
Provision for bad debts     (6,574 )     (5,558 )     (19,453 )     (16,260 )
Net service fee revenue   $ 160,453     $ 143,021     $ 487,820     $ 429,772