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SIGNIFICANT ACCOUNTING POLICIES - Schedule of Service Fee Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Revenue from External Customer [Line Items] |  |  |  |
Revenue | $ 401,968 | $ 350,044 | $ 1,196,247 | $ 1,046,185
Imaging Center Segment Revenue |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 399,081 | 349,144 | 1,188,849 | 1,043,129
Commercial insurance |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 223,555 | 189,634 | 665,604 | 573,259
Medicare |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 91,886 | 78,034 | 267,955 | 226,827
Medicaid |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 10,742 | 9,669 | 30,882 | 28,456
Workers' compensation/personal injury |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 9,952 | 13,200 | 35,478 | 38,785
Other patient revenue |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 10,664 | 7,646 | 30,793 | 22,334
Management fee revenue |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 3,957 | 6,099 | 12,203 | 17,199
Teleradiology and Software revenue |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 2,111 | 3,430 | 7,327 | 9,849
Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 6,173 | 3,431 | 20,625 | 12,054
Revenue under capitation arrangements |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 40,041 | 38,001 | 117,982 | 114,366
AI Segment Revenue |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | 2,887 | 900 | 7,398 | 3,056
Service Revenue |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue | $ 401,968 | $ 350,044 | $ 1,196,247 | $ 1,046,185

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