INVESTMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2024	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	$ 47,000	$ 46,100
Maximum ownership percentage for cost method investment (percent)	20.00%
Investment Owned, at Cost	$ 20,000	20,000
Cash and cash equivalents	108,234	126,450
Patient accounts receivable	359,359	313,373
Other current assets	26,053	30,060
Total current assets	526,448	496,935
Property and equipment	42,684	41,845
Operating lease right of use assets	88,425	88,939
Goodwill	1,244,679	1,244,679
Intangible assets	101,778	102,675
Other assets	85,857	85,097
Total assets	2,089,871	2,060,170
Accounts payable	36,249	28,237
Payroll and employee benefits	131,631	136,835
Accrued expenses	147,464	140,049
Operating lease liabilities	26,284	26,286
Total liabilities	947,217	940,387
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Cash and cash equivalents	9,100	8,800
Patient accounts receivable	7,800	9,000
Other current assets	0	100
Total current assets	16,900	17,900
Property and equipment	0	100
Operating lease right of use assets	0	100
Goodwill	8,500	8,500
Intangible assets	400	400
Other assets	400	300
Total assets	26,200	27,300
Accounts payable	500	500
Payroll and employee benefits	900	900
Accrued expenses	8,200	7,900
Total liabilities	$ 9,600	$ 9,300