GOODWILL AND OTHER INTANGIBLE ASSETS - Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	$ 554,509		$ 554,509		$ 554,519
Total accumulated amortization	(244,902)		(244,902)		(219,123)
Total intangible assets, net	309,607		309,607		335,396
Amortization expense for intangible assets	8,600	$ 8,600	25,800	$ 25,600
Referral sources
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	514,388		514,388		514,388
Total accumulated amortization	(222,549)		(222,549)		(199,084)
Trademarks/names
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	39,136		39,136		39,136
Total accumulated amortization	(21,874)		(21,874)		(19,698)
Other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	985		985		995
Total accumulated amortization	$ (479)		$ (479)		$ (341)