GOODWILL AND OTHER INTANGIBLE ASSETS - Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	$ 554,509	$ 554,519
Total accumulated amortization	(253,499)	(219,123)
Total intangible assets, net	301,010	335,396
Referral sources
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	514,388	514,388
Total accumulated amortization	(230,371)	(199,084)
Trademarks/names
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	39,136	39,136
Total accumulated amortization	(22,599)	(19,698)
Other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	985	995
Total accumulated amortization	$ (529)	$ (341)