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2. SUMMARY OF ACCOUNTING POLICIES (Details - Summary of net revenue) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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

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- Definition Amount of revenue recognized based on fees charged on a per capita basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=68054470&loc=d3e8200-115640 + Details
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