PROPERTY AND EQUIPMENT - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Equipment originally acquired under finance/capital lease	$ 11,557	$ 13,235
Total property and equipment cost	1,759,616	1,630,450
Accumulated depreciation	(951,914)	(935,659)
Property and equipment, net	807,702	694,791
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	250	250
Medical equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	872,464	807,624
Computer and office equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	100,604	134,355
Software costs
Property, Plant and Equipment [Line Items]
Property and equipment, gross	63,373	56,261
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 711,368	$ 618,725