SIGNIFICANT ACCOUNTING POLICIES (Details - Revenue) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue from External Customer [Line Items]
Total revenue	$ 289,097	$ 244,395	$ 560,647	$ 475,787
Commercial insurance
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	160,185	135,479	311,899	261,751
Medicare
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	60,151	49,079	114,280	93,107
Medicaid
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	7,295	6,760	14,423	12,800
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	11,014	8,450	22,062	16,906
Other patient revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	6,017	6,521	11,858	12,112
Management fee revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	1,753	3,945	3,870	7,621
Teleradiology and Software revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	4,063	4,000	8,449	7,816
Other
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	7,693	5,182	14,003	11,471
Service fee revenue
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	258,171	219,416	500,844	423,584
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Service fee revenue, net of contractual allowances and discounts	$ 30,926	$ 24,979	$ 59,803	$ 52,203