2. SIGNIFICANT ACCOUNTING POLICIES (Details - Revenue) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Commercial Insurance		$ 142,691	$ 134,962	$ 283,683	$ 266,439
Medicare		47,611	45,558	95,291	91,385
Medicaid		6,525	6,890	13,259	13,915
Workers Compensation/Personal Injury		8,867	8,966	17,925	18,485
Other	[1]	8,362	7,383	16,648	14,377
Service fee revenue, net of contractual allowances and discounts		214,056	203,759	426,806	404,601
Provision for bad debts		(11,854)	(12,326)	(23,500)	(22,630)
Net service fee revenue		202,202	191,433	403,306	381,971
Revenue under capitation arrangements		27,812	27,132	55,721	52,982
Total net revenue		$ 230,014	$ 218,565	$ 459,027	$ 434,953

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