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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Software Revenue Recognition, Software Development Costs, Deferred Financing Costs And Property And Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Service fee revenue | $ 1,829,664 | $ 1,616,630 | $ 1,430,061
Deferred financing costs, net of accumulated amortization | 2,300 | 1,600 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Revenue, remaining performance obligation, amount | $ 1,200 |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 12 months |  |
Minimum | Software and Software Development Costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
PP&E useful life | 1 year |  |
Minimum | Propery and Equipment, Net |  |  |
Property, Plant and Equipment [Line Items] |  |  |
PP&E useful life | 3 years |  |
Minimum | Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
PP&E useful life | 3 years |  |
Maximum | Software and Software Development Costs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
PP&E useful life | 12 years |  |
Maximum | Propery and Equipment, Net |  |  |
Property, Plant and Equipment [Line Items] |  |  |
PP&E useful life | 15 years |  |
Maximum | Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
PP&E useful life | 15 years |  |
Patient Services, Net | eRAD |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Service fee revenue | $ 27,800 | $ 20,200 | $ 13,200

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