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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]                      
Commercial Insurance [1]                 $ 539,793 $ 486,489 $ 437,525
Medicare                 187,941 168,545 159,562
Medicaid                 28,170 23,948 24,499
Workers Compensation/Personal Injury                 36,548 32,728 30,543
Other [2]                 29,135 35,046 18,007
Service fee revenue, net of contractual allowances and discounts                 821,587 746,756 670,136
Provision for bad debts                 (45,387) (36,033) (29,807)
Net service fee revenue                 776,200 710,723 640,329
Revenue under capitation arrangements                 108,335 98,905 77,240
Total net revenue $ 224,939 $ 224,643 $ 218,565 $ 216,388 $ 215,706 $ 208,366 $ 204,289 $ 181,267 $ 884,535 $ 809,628 $ 717,569
[1] 21% of our net service fees revenue for the year ended December 31, 2016 and 20% for the years ended December 31, 2015 and 2014 were earned from a single payor.
[2] Other consists of revenue from teleradiology services, consulting fees and software revenue.