INVESTMENTS (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Variable Interest Entity [Line Items]
Minimum ownership percentage for controlling interest (percent)	50.00%
Maximum ownership percentage for equity method investment (percent)	50.00%
Equity method investment, aggregate cost	$ 49,300		$ 46,100
Maximum ownership percentage for cost method investment (percent)	20.00%
Investments in equity method investees	$ 1,046	$ 0
Investment Owned, at Cost	20,000		20,000
Cash and cash equivalents	245,450		126,450
Patient accounts receivable	301,050		313,373
Other current assets	12,962		30,060
Total current assets	579,947		496,935
Property and equipment	42,000		41,845
Operating lease right of use assets	85,110		88,939
Goodwill	1,244,679		1,244,679
Intangible assets	99,698		102,675
Other assets	87,680		85,097
Total assets	2,139,114		2,060,170
Accounts payable	32,117		28,237
Payroll and employee benefits	138,374		136,835
Accrued expenses	145,611		140,049
Total liabilities	938,675		940,387
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Cash and cash equivalents	10,900		8,800
Patient accounts receivable	6,800		9,000
Other current assets	0		100
Total current assets	17,700		17,900
Property and equipment	0		100
Operating lease right of use assets	100		100
Goodwill	8,500		8,500
Intangible assets	400		400
Other assets	0		300
Total assets	26,700		27,300
Accounts payable	600		500
Payroll and employee benefits	1,000		900
Accrued expenses	9,700		7,900
Total liabilities	$ 11,300		$ 9,300