MEDICAL COSTS PAYABLE - Change in Medical Costs Payable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Medical costs payable - January 1	$ 817,975	$ 249,777
Incurred related to:
Current year	4,443,878	2,647,719
Prior year	(36,322)	1,726
Total incurred	4,407,556	2,649,445
Paid related to:
Current year	3,538,386	2,074,602
Prior year	712,019	232,312
Total paid	4,250,405	2,306,914
Acquired claims liabilities	0	92,737
Medical costs payable - September 30	$ 975,126	$ 685,045