FAIR VALUES OF FINANCIAL INSTRUMENTS - Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Assets:
Cash and cash equivalents	$ 614,200	$ 897,850
Escrow deposits and restricted cash	62,557	59,383
Non-mortgage loans receivable, net	20,915	28,129
Liabilities:
Senior notes payable and other debt, gross	13,154,874	13,618,802
Non-mortgage loans receivable, net
Assets:
Non-mortgage loans receivable, net	20,915	28,129
Non-mortgage loans receivable, fair value	20,528	27,640
Secured/mortgage loans and other, net
Assets:
Secured mortgage loans and other, net	183,652	144,872
Secured mortgage loans and other, net, fair value	184,534	146,229
Carrying Amount
Assets:
Cash and cash equivalents	614,200	897,850
Escrow deposits and restricted cash	62,557	59,383
Derivative instruments	22,286	53,100
Liabilities:
Derivative instruments	7,365	5,887
Redeemable OP Units	213,288	200,420
Carrying Amount | Non-mortgage loans receivable, net
Assets:
Non-mortgage loans receivable, net	20,915	28,129
Carrying Amount | Secured/mortgage loans and other, net
Assets:
Secured mortgage loans and other, net	183,652	144,872
Fair Value
Assets:
Cash and cash equivalents, fair value	614,200	897,850
Escrow deposits and restricted cash	62,557	59,383
Derivative instruments	22,286	53,100
Liabilities:
Senior notes payable and other debt, gross, fair value	13,135,881	13,411,066
Derivative instruments	7,365	5,887
Redeemable OP Units, fair value	213,288	200,420
Fair Value | Non-mortgage loans receivable, net
Assets:
Non-mortgage loans receivable, fair value	20,528	27,640
Fair Value | Secured/mortgage loans and other, net
Assets:
Secured mortgage loans and other, net, fair value	$ 184,534	$ 146,229