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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Summary of net revenue) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue from External Customer [Line Items]                      
Service fee revenue, net of contractual allowances and discounts                 $ 1,028,236 $ 868,741  
Total revenue $ 300,840 $ 292,692 $ 289,097 $ 271,549 $ 257,211 $ 242,148 $ 244,395 $ 231,392 1,154,179 975,146 $ 922,186
Health Care, Patient Service                      
Revenue from External Customer [Line Items]                      
Service fee revenue, net of contractual allowances and discounts                 1,028,236 868,741 857,178
Provision for bad debts                     (46,555)
Commercial insurance                      
Revenue from External Customer [Line Items]                      
Service fee revenue, net of contractual allowances and discounts                 642,341 542,011 534,224
Medicare                      
Revenue from External Customer [Line Items]                      
Service fee revenue, net of contractual allowances and discounts                 237,427 192,881 179,678
Medicaid                      
Revenue from External Customer [Line Items]                      
Service fee revenue, net of contractual allowances and discounts                 28,283 25,615 24,133
Workers' compensation/personal injury                      
Revenue from External Customer [Line Items]                      
Service fee revenue, net of contractual allowances and discounts                 42,792 34,193 32,969
Other patient revenue                      
Revenue from External Customer [Line Items]                      
Service fee revenue, net of contractual allowances and discounts                 23,862 25,117 29,882
Management fee revenue                      
Revenue from External Customer [Line Items]                      
Service fee revenue, net of contractual allowances and discounts                 11,659 13,882 13,127
Imaging on call and software                      
Revenue from External Customer [Line Items]                      
Service fee revenue, net of contractual allowances and discounts                 17,317 16,261 18,116
Other                      
Revenue from External Customer [Line Items]                      
Service fee revenue, net of contractual allowances and discounts                 24,555 18,781 25,049
Net service fee revenue                      
Revenue from External Customer [Line Items]                      
Service fee revenue, net of contractual allowances and discounts                 1,028,236 868,741 810,623
Revenue under capitation arrangements                      
Revenue from External Customer [Line Items]                      
Service fee revenue, net of contractual allowances and discounts                 $ 125,943 $ 106,405 $ 111,563