2. SIGNIFICANT ACCOUNTING POLICIES (Details - Revenue) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accounting Policies [Abstract]
Commercial Insurance		$ 140,956	$ 135,299	$ 424,639	$ 401,780
Medicare		47,941	48,740	143,234	140,089
Medicaid		6,233	7,554	19,491	21,461
Workers Compensation/Personal Injury		8,626	9,449	26,550	27,935
Other	[1]	7,557	7,388	24,205	21,766
Service fee revenue, net of contractual allowances and discounts		211,313	208,430	638,119	613,031
Provision for bad debts		(11,687)	(11,253)	(35,187)	(33,883)
Net service fee revenue		199,626	197,177	602,932	579,148
Revenue under capitation arrangements		27,981	27,466	83,702	80,448
Total net revenue		$ 227,607	$ 224,643	$ 686,634	$ 659,596

[1] Other consists of revenue from teleradiology services, consulting fees and software revenue.