REVENUE - Net Revenue Earned by Category of Payer (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Net revenue	$ 1,020,918	$ 891,937	$ 2,917,522	$ 2,511,446
Commercial payers
Disaggregation of Revenue [Line Items]
Net revenue	888,162	769,524	2,526,354	2,164,678
Government payers
Disaggregation of Revenue [Line Items]
Net revenue	122,793	106,645	357,383	307,067
Patients
Disaggregation of Revenue [Line Items]
Net revenue	$ 9,963	$ 15,768	$ 33,785	$ 39,701