FAIR VALUES OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets:
Cash and cash equivalents	$ 145,146	$ 149,725
Escrow deposits and restricted cash	50,492	46,872
Non-mortgage loans receivable, net	24,257	19,024
Liabilities:
Senior notes payable and other debt, gross	12,276,530	12,093,138
Redeemable OP Units, fair value	152,900	182,100
Non-mortgage loans receivable, net
Assets:
Non-mortgage loans receivable, net	24,257	19,024
Non-mortgage loans receivable, fair value	23,366	19,039
Secured/mortgage loans and other, net
Assets:
Secured mortgage loans and other, net	488,515	488,913
Debt securities, held-to-maturity, fair value	451,781	478,931
Government-sponsored pooled loan investments, net
Assets:
Government-sponsored pooled loan investments, net	40,802	41,213
Carrying Amount
Assets:
Cash and cash equivalents	145,146	149,725
Escrow deposits and restricted cash	50,492	46,872
Derivative instruments	26,477	1,128
Liabilities:
Derivative instruments	0	12,290
OP Units	152,886	182,112
Carrying Amount | Brookdale Senior Living
Assets:
Stock warrants	38,187	48,884
Carrying Amount | Non-mortgage loans receivable, net
Assets:
Non-mortgage loans receivable, net	24,257	19,024
Carrying Amount | Secured/mortgage loans and other, net
Assets:
Secured mortgage loans and other, net	488,515	488,913
Carrying Amount | Government-sponsored pooled loan investments, net
Assets:
Government-sponsored pooled loan investments, net	40,802	41,213
Fair Value
Assets:
Cash and cash equivalents, fair value	145,146	149,725
Escrow deposits and restricted cash	50,492	46,872
Derivative instruments	26,477	1,128
Liabilities:
Long-term debt and short-term borrowings, fair value	11,353,545	12,891,937
Derivative instruments	0	12,290
Redeemable OP Units, fair value	152,886	182,112
Fair Value | Brookdale Senior Living
Assets:
Stock warrants	38,187	48,884
Fair Value | Non-mortgage loans receivable, net
Assets:
Non-mortgage loans receivable, fair value	23,366	19,039
Fair Value | Secured/mortgage loans and other, net
Assets:
Debt securities, held-to-maturity, fair value	451,781	478,931
Fair Value | Government-sponsored pooled loan investments, net
Assets:
Government-sponsored pooled loan investments, net	$ 40,802	$ 41,213