SIGNIFICANT ACCOUNTING POLICIES (Details - Revenue) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	$ 291,776	$ 292,692	$ 763,905	$ 853,338
Total service revenue	291,776	292,692	763,905	853,338
Commercial insurance
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	160,524	163,152	412,415	475,064
Medicare
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	62,704	61,599	154,847	175,825
Medicaid
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	7,098	7,128	18,072	21,564
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	7,183	10,865	25,705	32,950
Other patient revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	8,328	6,085	17,211	17,947
Management fee revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	2,675	1,792	8,574	5,662
Teleradiology and Software revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	2,349	4,412	8,319	12,861
Other
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	5,869	6,875	15,617	20,878
Service fee revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	256,730	261,908	660,760	762,751
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	$ 35,046	$ 30,784	$ 103,145	$ 90,587