GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	$ 598,981	$ 598,981
Total accumulated amortization	(299,073)	(289,803)
Total intangible assets, net	299,908	309,178
Referral sources
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	551,188	551,188
Total accumulated amortization	(272,343)	(263,907)
Trademarks/names
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	46,808	46,808
Total accumulated amortization	(25,955)	(25,170)
Other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	985	985
Total accumulated amortization	$ (775)	$ (726)