REVENUE - Net Revenue Earned by Category of Payer (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Net revenue	$ 980,820	$ 860,272	$ 1,896,604	$ 1,619,509
Commercial payers
Disaggregation of Revenue [Line Items]
Net revenue	851,915	746,647	1,638,192	1,395,154
Government payers
Disaggregation of Revenue [Line Items]
Net revenue	119,385	102,581	234,590	200,422
Patients
Disaggregation of Revenue [Line Items]
Net revenue	$ 9,520	$ 11,044	$ 23,822	$ 23,933