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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Summary of net revenue) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | $ 1,315,077 | $ 1,071,840 | $ 1,154,179
Total revenue | 1,315,077 | 1,071,840 | 1,154,179
Commercial insurance |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 743,462 | 584,035 | 642,341
Medicare |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 280,911 | 217,928 | 237,427
Medicaid |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 34,731 | 25,619 | 28,283
Workers' compensation/personal injury |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 44,235 | 33,478 | 42,792
Other patient revenue |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 19,398 | 25,314 | 23,862
Management fee revenue |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 19,630 | 11,253 | 11,659
Imaging on call and software |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 10,525 | 10,798 | 17,317
Other |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 13,851 | 23,297 | 24,555
Service fee revenue |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | 1,166,743 | 931,722 | 1,028,236
Revenue under capitation arrangements |  |  |
Revenue from External Customer [Line Items] |  |  |
Service fee revenue | $ 148,334 | $ 140,118 | $ 125,943

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