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1. NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details - Revenue) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Commercial Insurance $ 114,827 $ 109,472 $ 331,670 $ 314,300
Medicare 40,840 41,203 120,039 118,627
Medicaid 6,117 6,248 17,582 18,214
Workers Compensation/Personal Injury 7,712 7,821 23,287 22,708
Other 23,408 6,354 53,759 24,687
Service fee revenue, net of contractual allowances and discounts 192,904 171,098 546,337 498,536
Provision for bad debts (9,433) (7,532) (25,295) (21,945)
Net service fee revenue 183,471 163,566 521,042 476,591
Revenue under capitation arrangements 24,895 20,493 72,880 55,426
Total net revenue $ 208,366 $ 184,059 $ 593,922 $ 532,017