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SIGNIFICANT ACCOUNTING POLICIES (Details - Revenue) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	$ 332,690	$ 291,776	$ 981,928	$ 763,905
Total service revenue	332,690	291,776	981,928	763,905
Commercial insurance
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	185,723	160,524	555,355	412,415
Medicare
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	73,163	62,704	207,977	154,847
Medicaid
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	8,707	7,098	26,198	18,072
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	11,554	7,183	32,507	25,705
Other patient revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	4,800	8,328	14,766	17,211
Management fee revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	5,255	2,675	16,007	8,574
Teleradiology and Software revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	2,564	2,349	7,611	8,319
Other
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	3,641	5,869	10,058	15,617
Service fee revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	295,407	256,730	870,479	660,760
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	$ 37,283	$ 35,046	$ 111,449	$ 103,145