SIGNIFICANT ACCOUNTING POLICIES (Details - Revenue) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	$ 315,319	$ 281,564
Total service revenue	315,319	281,564
Commercial insurance
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	182,096	155,461
Medicare
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	63,589	57,749
Medicaid
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	8,451	6,628
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	10,399	10,274
Other patient revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	4,775	5,662
Management fee revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	5,219	2,567
Teleradiology and Software revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	2,426	3,770
Other
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	2,622	6,222
Service fee revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	279,577	248,333
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	$ 35,742	$ 33,231