FAIR VALUES OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Assets:
Cash and cash equivalents	$ 145,357	$ 122,564
Escrow deposits and restricted cash	49,924	48,181
Non-mortgage loans receivable, net	24,418	24,338
Liabilities:
Senior notes payable and other debt, gross	12,406,943	12,361,244
Non-mortgage loans receivable, net
Assets:
Non-mortgage loans receivable, net	24,418	24,338
Non-mortgage loans receivable, fair value	23,585	23,416
Secured/mortgage loans and other, net
Assets:
Secured mortgage loans and other, net	513,004	513,669
Debt securities, held-to-maturity, fair value	501,073	493,627
Government-sponsored pooled loan investments, net
Assets:
Government-sponsored pooled loan investments, net		43,406
Carrying Amount
Assets:
Cash and cash equivalents	145,357	122,564
Escrow deposits and restricted cash	49,924	48,181
Derivative instruments	17,998	24,316
Liabilities:
Derivative instruments	2,623	145
Redeemable Noncontrolling Interest, Equity, Carrying Amount	157,432	162,663
Carrying Amount | Brookdale Senior Living
Assets:
Stock warrants	24,592	23,621
Carrying Amount | Non-mortgage loans receivable, net
Assets:
Non-mortgage loans receivable, net	24,418	24,338
Carrying Amount | Secured/mortgage loans and other, net
Assets:
Secured mortgage loans and other, net	501,004	493,669
Carrying Amount | Government-sponsored pooled loan investments, net
Assets:
Government-sponsored pooled loan investments, net	0	43,406
Fair Value
Assets:
Cash and cash equivalents, fair value	145,357	122,564
Escrow deposits and restricted cash	49,924	48,181
Derivative instruments	17,998	24,316
Liabilities:
Long-term debt and short-term borrowings, fair value	11,694,570	11,493,824
Derivative instruments	2,623	145
Redeemable OP Units, fair value	157,432	162,663
Fair Value | Brookdale Senior Living
Assets:
Stock warrants	24,592	23,621
Fair Value | Non-mortgage loans receivable, net
Assets:
Non-mortgage loans receivable, fair value	23,585	23,416
Fair Value | Secured/mortgage loans and other, net
Assets:
Debt securities, held-to-maturity, fair value	501,073	493,627
Fair Value | Government-sponsored pooled loan investments, net
Assets:
Government-sponsored pooled loan investments, net	$ 0	$ 43,406