REVENUE AND ACCOUNTS RECEIVABLE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 3,008,711	$ 2,611,476	$ 2,387,439
Rental revenue	$ 16,757	$ 15,985	$ 15,157
Customer Concentration Risk \| Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percentage of Revenue	100.00%	100.00%	100.00%
Total Medicaid and Medicare
Disaggregation of Revenue [Line Items]
Revenue	$ 2,216,194	$ 1,922,333	$ 1,777,469
Total Medicaid and Medicare \| Customer Concentration Risk \| Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percentage of Revenue	73.70%	73.60%	74.50%
Medicaid
Disaggregation of Revenue [Line Items]
Revenue	$ 1,183,156	$ 1,022,460	$ 900,249
Medicaid \| Customer Concentration Risk \| Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percentage of Revenue	39.30%	39.20%	37.70%
Medicare
Disaggregation of Revenue [Line Items]
Revenue	$ 832,160	$ 727,103	$ 727,374
Medicare \| Customer Concentration Risk \| Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percentage of Revenue	27.70%	27.80%	30.50%
Medicaid — skilled
Disaggregation of Revenue [Line Items]
Revenue	$ 200,878	$ 172,770	$ 149,846
Medicaid — skilled \| Customer Concentration Risk \| Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percentage of Revenue	6.70%	6.60%	6.30%
Managed care
Disaggregation of Revenue [Line Items]
Revenue	$ 525,710	$ 456,728	$ 367,095
Managed care \| Customer Concentration Risk \| Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percentage of Revenue	17.50%	17.50%	15.40%
Private and other
Disaggregation of Revenue [Line Items]
Revenue	$ 266,807	$ 232,415	$ 242,875
Private and other \| Customer Concentration Risk \| Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percentage of Revenue	8.80%	8.90%	10.10%