COMMITMENTS AND CONTINGENCIES (Details)	3 Months Ended		9 Months Ended		32 Months Ended
	Sep. 30, 2019 USD ($) lawsuit	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) lawsuit	Sep. 30, 2018 USD ($)	Feb. 14, 2016 civil_investigative_demand	Dec. 31, 2018 USD ($)	Oct. 31, 2014 facility
Malpractice Insurance [Line Items]
Number of professional liability lawsuits | lawsuit	91		91
Cash expenditures for self-insured professional liability costs			$ 5,398,000	$ 5,088,000
Estimated insurance recovery receivables	$ 2,305,000		2,305,000			$ 5,475,000
Litigation contingency, less current portion	9,000,000		9,000,000			6,400,000
Litigation contingency expense	0	$ 6,400,000	3,100,000	$ 6,400,000
Other Insurance
Liability for workers compensation claims	806,000		806,000			618,000
Workers compensation insurance, non current receivable for excess premiums paid	1,538,000		1,538,000			1,258,000
Unfavorable regulatory action | Potential violations of false claims act
Malpractice Insurance [Line Items]
Number of facilities | facility							2
Number of civil investigative demands received | civil_investigative_demand					3
Litigation contingency, less current portion	9,500,000		9,500,000
Litigation contingency expense	3,100,000
Litigation contingency, current	500,000		$ 500,000
Expected period to remit settlement			5 years
Professional malpractice liability insurance
Malpractice Insurance [Line Items]
Liability for reported and estimated future claims	26,680,000		$ 26,680,000			$ 27,201,000
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		200,000
Liability for reported claims and estimates for incurred but unreported claims	$ 1,756,000		1,756,000
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	31		31