SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Land use rights and Segment Reporting (Details) $ in Thousands	12 Months Ended
Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)
Leases
Number of operating segment \| segment	1
Property, equipment and software, net	$ 354,617	$ 253,471
UK
Leases
Property, equipment and software, net	46,827	4,180
Germany
Leases
Property, equipment and software, net	$ 54,470	$ 26,544
Land Improvements [Member] \| Minimum
Leases
Operating lease term of contract	40 years
Land Improvements [Member] \| Maximum
Leases
Operating lease term of contract	50 years

The number of operating segments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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