CONCENTRATION OF CREDIT RISK - Senior Housing Operating Portfolio (Details) - property	Dec. 31, 2022	Jul. 30, 2021
Concentration Risk [Line Items]
Number of real estate properties	1,300
Consolidated Seniors Housing Communities
Concentration Risk [Line Items]
Number of independent third party managed properties	544
Atria and Sunrise | Senior Housing
Concentration Risk [Line Items]
Number of independent third party managed properties	334
Holiday Retirement [Member] | Senior Living Communities, Operations to be Transitioned
Concentration Risk [Line Items]
Number of independent third party managed properties	91	26
Atria | Senior Housing
Concentration Risk [Line Items]
Number of independent third party managed properties	242
Experienced Operators | Senior Living Communities, Operations to be Transitioned
Concentration Risk [Line Items]
Number of real estate properties	90
Sunrise | Senior Living Communities, Operations to be Transitioned
Concentration Risk [Line Items]
Number of independent third party managed properties	92