ACCOUNTING POLICIES - Schedule of Domestic and Foreign Break out Percentages (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Medical Services Revenues
Accounting Policies [Line Items]
Break out, percentage	100.00%	100.00%	100.00%
Property, Plant and Equipment
Accounting Policies [Line Items]
Break out, percentage	100.00%	100.00%	100.00%
Domestic | Medical Services Revenues
Accounting Policies [Line Items]
Break out, percentage	94.00%	96.00%	99.00%
Domestic | Property, Plant and Equipment
Accounting Policies [Line Items]
Break out, percentage	93.00%	93.00%	93.00%
Foreign | Medical Services Revenues
Accounting Policies [Line Items]
Break out, percentage	6.00%	4.00%	1.00%
Foreign | Property, Plant and Equipment
Accounting Policies [Line Items]
Break out, percentage	7.00%	7.00%	7.00%