SIGNIFICANT ACCOUNTING POLICIES (Details - Revenue) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from External Customer [Line Items]
Total revenue	$ 271,549	$ 231,392
Commercial insurance
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	151,678	126,225
Medicare
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	54,199	44,076
Medicaid
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	7,120	6,048
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	11,027	8,431
Other patient revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	5,835	5,606
Management fee revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	2,117	3,677
Teleradiology and Software revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	4,386	3,816
Other
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	6,310	6,289
Service fee revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	242,672	204,168
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	$ 28,877	$ 27,224