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2. SUMMARY OF ACCOUNTING POLICIES (Details - Summary of net revenue) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]                      
Commercial Insurance                 $ 571,369 $ 539,793 $ 486,489
Medicare                 193,166 187,941 168,545
Medicaid                 25,821 28,170 23,948
Workers compensation/personal injury                 35,195 36,548 32,728
Other (1) [1]                 31,627 29,135 35,046
Service fee revenue, net of contractual allowances and discounts                 857,178 821,587 746,756
Provision for bad debts                 (46,555) (45,387) (36,033)
Net service fee revenue                 810,623 776,200 710,723
Revenue under capitation arrangements                 111,563 108,335 98,905
Total net revenue $ 235,552 $ 227,607 $ 230,014 $ 229,013 $ 224,939 $ 224,643 $ 218,565 $ 216,388 $ 922,186 $ 884,535 $ 809,628
[1] Other consists of revenue from teleradiology services, consulting fees and software revenue