2. SUMMARY OF ACCOUNTING POLICIES (Details - Summary of net revenue) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Commercial Insurance	[1]									$ 486,489	$ 437,525	$ 430,735
Medicare										168,545	159,562	156,066
Medicaid										23,948	24,499	24,017
Workers Compensation/Personal Injury										32,728	30,543	34,821
Other	[2]									35,046	18,007	19,668
Service fee revenue, net of contractual allowances and discounts										746,756	670,136	665,307
Provision for bad debts										(36,033)	(29,807)	(27,911)
Net service fee revenue										710,723	640,329	637,396
Revenue under capitation arrangements										98,905	77,240	65,590
Total net revenue		$ 215,706	$ 208,366	$ 204,289	$ 181,267	$ 185,552	$ 184,059	$ 179,082	$ 168,876	$ 809,628	$ 717,569	$ 702,986

[1] 20% of our net service fees revenue for each of the years ended December 31, 2015, 2014 and 2013 were earned from a single payor.

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