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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	$ 598,981		$ 598,981		$ 554,509
Total accumulated amortization	(271,264)		(271,264)		(253,499)
Total intangible assets, net	327,717		327,717		301,010
Amortization expense for intangible assets	9,300	$ 8,600	18,400	$ 17,200
Referral sources
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	551,188		551,188		514,388
Total accumulated amortization	(247,037)		(247,037)		(230,371)
Trademarks/names
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	46,808		46,808		39,136
Total accumulated amortization	(23,600)		(23,600)		(22,599)
Other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Total gross intangible assets	985		985		985
Total accumulated amortization	$ (627)		$ (627)		$ (529)