SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Summary of net revenue) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Service fee revenue	$ 1,071,840	$ 1,154,179	$ 975,146
Total revenue	1,071,840	1,154,179	975,146
Commercial insurance
Revenue from External Customer [Line Items]
Service fee revenue	584,035	642,341	542,011
Medicare
Revenue from External Customer [Line Items]
Service fee revenue	217,928	237,427	192,881
Medicaid
Revenue from External Customer [Line Items]
Service fee revenue	25,619	28,283	25,615
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Service fee revenue	33,478	42,792	34,193
Other patient revenue
Revenue from External Customer [Line Items]
Service fee revenue	25,314	23,862	25,117
Management fee revenue
Revenue from External Customer [Line Items]
Service fee revenue	11,253	11,659	13,882
Imaging on call and software
Revenue from External Customer [Line Items]
Service fee revenue	10,798	17,317	16,261
Other
Revenue from External Customer [Line Items]
Service fee revenue	23,297	24,555	18,781
Service fee revenue
Revenue from External Customer [Line Items]
Service fee revenue	931,722	1,028,236	868,741
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Service fee revenue	$ 140,118	$ 125,943	$ 106,405