DESCRIPTION OF BUSINESS (Details)	Sep. 30, 2019 property tenant
Real estate properties
Number of real estate properties	1,200
Largest tenants | tenant	3
Brookdale Senior Living
Real estate properties
Number of real estate properties	124
Number of Brookdale Senior Living properties excluded from count	2
Ardent
Real estate properties
Number of real estate properties	11
Kindred
Real estate properties
Number of real estate properties	32
Development Projects
Real estate properties
Number of real estate properties	23
Development Projects | Unconsolidated Real Estate Entities
Real estate properties
Number of real estate properties	4
Triple-Net Leased Properties
Real estate properties
Number of real estate properties	423
Seniors Housing Communities
Real estate properties
Number of real estate properties	400