COMMITMENTS AND CONTINGENCIES (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) lawsuit	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Malpractice Insurance [Line Items]
Number of professional liability lawsuits | lawsuit	98
Cash expenditures for self-insured professional liability costs	$ 1,840,000	$ 1,906,000
Other Insurance
Liability for workers compensation claims	944,000		$ 921,000
Workers compensation insurance, non current receivable for excess premiums paid	1,666,000		1,575,000
Professional malpractice liability insurance
Malpractice Insurance [Line Items]
Liability for reported and estimated future claims	26,403,000		27,390,000
Prefunded deductible policy
Malpractice Insurance [Line Items]
Insurance policy coverage limits per claim	500,000
Other Insurance
Insurance policy coverage limits per claim	500,000
Professional liability insurance, annual coverage limit per facility	3,000,000
Health insurance, maximum self-insured annual amount per individual	200,000
Liability for reported claims and estimates for incurred but unreported claims	1,747,000
SHC Risk Carriers, Inc | Professional malpractice liability insurance
Malpractice Insurance [Line Items]
Insurance policy coverage limits per claim	1,000,000
Malpractice insurance annual sublimit per center	3,000,000
Aggregate policy limit	5,000,000
Other Insurance
Insurance policy coverage limits per claim	$ 1,000,000
Scheduled for trial or arbitration over next 12 months
Malpractice Insurance [Line Items]
Number of professional liability lawsuits | lawsuit	15
Civil Investigative Demand
Malpractice Insurance [Line Items]
Settlement payment period	5 years
Payments made during period	$ 500,000
Current loss accrual	1,000,000
Noncurrent loss accrual	8,000,000
Self Insurance Receivable, Current
Malpractice Insurance [Line Items]
Estimated insurance recovery receivables	1,831,000		1,011,000
Other Noncurrent Assets
Malpractice Insurance [Line Items]
Estimated insurance recovery receivables	$ 155,000		$ 1,555,000