2. SIGNIFICANT ACCOUNTING POLICIES (Details - Revenue) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Service fee revenue, net of contractual allowances and discounts		$ 217,552	$ 211,313	$ 641,136	$ 638,119
Provision for bad debts		0	(11,687)	0	(35,187)
Net service fee revenue		217,552	199,626	641,136	602,932
Revenue under capitation arrangements		24,596	27,981	76,799	83,702
Total net revenue		242,148	227,607	717,935	686,634
Commercial Insurance [Member]
Service fee revenue, net of contractual allowances and discounts		144,731	140,956	426,710	424,639
Medicare [Member]
Service fee revenue, net of contractual allowances and discounts		49,292	47,941	145,158	143,234
Medicaid [Member]
Service fee revenue, net of contractual allowances and discounts		6,461	6,233	19,645	19,491
Workers' Compensation/Personal Injury [Member]
Service fee revenue, net of contractual allowances and discounts		9,002	8,626	26,407	26,550
Other [Member]
Service fee revenue, net of contractual allowances and discounts	[1]	$ 8,066	$ 7,557	$ 23,216	$ 24,205

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