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1. NATURE OF BUSINESS AND BASIS OF PRESENTATION (Tables)
3 Months Ended
Mar. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Service fee revenue

    2014     2013  
                 
Commercial insurance   $ 104,614     $ 106,558  
Medicare     33,666       35,713  
Medicaid     5,163       5,777  
Workers' compensation/personal injury     7,453       7,316  
Other     7,867       8,377  
Service fee revenue, net of contractual allowances and discounts     158,763       163,741  
Provision for bad debts     (6,893 )     (6,822 )
Net service fee revenue     151,870       156,919  
Revenue under capitation arrangements     17,006       16,021  
Total net revenue   $ 168,876     $ 172,940