SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Summary of net revenue) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from External Customer [Line Items]
Service fee revenue	$ 1,315,077	$ 1,071,840	$ 1,154,179
Total revenue	1,315,077	1,071,840	1,154,179
Commercial insurance
Revenue from External Customer [Line Items]
Service fee revenue	743,462	584,035	642,341
Medicare
Revenue from External Customer [Line Items]
Service fee revenue	280,911	217,928	237,427
Medicaid
Revenue from External Customer [Line Items]
Service fee revenue	34,731	25,619	28,283
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Service fee revenue	44,235	33,478	42,792
Other patient revenue
Revenue from External Customer [Line Items]
Service fee revenue	19,398	25,314	23,862
Management fee revenue
Revenue from External Customer [Line Items]
Service fee revenue	19,630	11,253	11,659
Imaging on call and software
Revenue from External Customer [Line Items]
Service fee revenue	10,525	10,798	17,317
Other
Revenue from External Customer [Line Items]
Service fee revenue	13,851	23,297	24,555
Service fee revenue
Revenue from External Customer [Line Items]
Service fee revenue	1,166,743	931,722	1,028,236
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Service fee revenue	$ 148,334	$ 140,118	$ 125,943