INVESTMENT IN REAL ESTATE PROPERTIES - Senior Housing - Managed Communities Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Resident fees and services	$ 155,512	$ 156,045	$ 128,058
Ancillary services
Disaggregation of Revenue [Line Items]
Resident fees and services	$ 1,300	$ 900	$ 800