COMMITMENTS AND CONTINGENCIES (Details)	3 Months Ended	6 Months Ended
	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) lawsuit	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Malpractice Insurance [Line Items]
Number of professional liability lawsuits | lawsuit		94
Cash expenditures for self-insured professional liability costs		$ 3,590,000	$ 3,606,000
Other Insurance
Liability for workers compensation claims		1,249,000		$ 921,000
Workers compensation insurance, non current receivable for excess premiums paid		1,792,000		1,575,000
Professional malpractice liability insurance
Malpractice Insurance [Line Items]
Liability for reported and estimated future claims		26,136,000		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		2,448,000		1,810,000
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		26
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		1,573,000		1,011,000
Other Noncurrent Assets
Malpractice Insurance [Line Items]
Estimated insurance recovery receivables		$ 155,000		$ 1,555,000