COMMITMENTS AND CONTINGENCIES (Details)	9 Months Ended		32 Months Ended
	Sep. 30, 2018 USD ($) lawsuit	Sep. 30, 2017 USD ($)	Feb. 29, 2016 civil_investigative_demand	Dec. 31, 2017 USD ($)	Oct. 31, 2014 facility
Malpractice Insurance [Line Items]
Number of professional liability lawsuits | lawsuit	83
Cash expenditures for self-insured professional liability costs	$ 4,452,000	$ 6,077,000
Estimated insurance recovery receivables	5,425,000
Accrued litigation contingency	6,400,000			$ 0
Other Insurance
Liability for workers compensation claims	620,000
Workers compensation insurance, non current receivable for excess premiums paid	1,074,000
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
Professional malpractice liability insurance
Malpractice Insurance [Line Items]
Liability for reported and estimated future claims	27,070,000
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	1,662,000
SHC Risk Carriers, Inc | Professional malpractice liability insurance
Malpractice Insurance [Line Items]
Insurance policy coverage limits per claim	500,000
Malpractice insurance annual sublimit per center	1,000,000
Aggregate policy limit	5,000,000
Other Insurance
Insurance policy coverage limits per claim	$ 500,000
Scheduled for trial or arbitration over next 12 months
Malpractice Insurance [Line Items]
Number of professional liability lawsuits | lawsuit	20