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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, 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.

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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=51673510&loc=d3e8200-115640 + Details
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