GOODWILL AND OTHER INTANGIBLE ASSETS - Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Intangible Asset, Finite-Lived [Line Items]
Total gross intangible assets	$ 598,981		$ 598,981		$ 598,981
Total accumulated amortization	(308,342)		(308,342)		(289,803)
Total intangible assets, net	290,639		290,639		309,178
Amortization expense for intangible assets	9,300	$ 9,300	18,500	$ 18,400
Referral sources
Intangible Asset, Finite-Lived [Line Items]
Total gross intangible assets	551,188		551,188		551,188
Total accumulated amortization	(280,778)		(280,778)		(263,907)
Trademarks/names
Intangible Asset, Finite-Lived [Line Items]
Total gross intangible assets	46,808		46,808		46,808
Total accumulated amortization	(26,740)		(26,740)		(25,170)
Other amortizable intangible assets
Intangible Asset, Finite-Lived [Line Items]
Total gross intangible assets	985		985		985
Total accumulated amortization	$ (824)		$ (824)		$ (726)