SIGNIFICANT ACCOUNTING POLICIES (Details - Revenue) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue from External Customer [Line Items]
Total revenue	$ 281,564	$ 271,549
Commercial insurance
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	155,461	151,678
Medicare
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	57,749	54,199
Medicaid
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	6,628	7,120
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	10,274	11,027
Other patient revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	5,662	5,835
Management fee revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	2,567	2,117
Teleradiology and Software revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	3,770	4,386
Other
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	6,222	6,310
Service fee revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	248,333	242,672
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	$ 33,231	$ 28,877