FAIR VALUES OF FINANCIAL INSTRUMENTS - Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets:
Cash and cash equivalents	$ 188,617	$ 897,850
Escrow deposits and restricted cash	53,934	59,383
Secured mortgage loans and other, net	207,185	176,811
Secured mortgage loans and other, net, fair value	203,536	173,869
Non-mortgage loans receivable, net	20,871	28,129
Liabilities:
Senior notes payable and other debt, gross	12,664,182	13,618,802
Non-mortgage loans receivable, net
Assets:
Secured mortgage loans and other, net	24,681	31,939
Secured mortgage loans and other, net, fair value	20,227	27,640
Carrying Amount
Assets:
Cash and cash equivalents	188,617	897,850
Escrow deposits and restricted cash	53,934	59,383
Derivative instruments	11,928	53,100
Liabilities:
Derivative instruments	7,875	5,887
Redeemable OP Units	235,964	200,420
Carrying Amount | Non-mortgage loans receivable, net
Assets:
Non-mortgage loans receivable, net	20,871	28,129
Carrying Amount | Secured/mortgage loans and other, net
Assets:
Secured mortgage loans and other, net	182,504	144,872
Fair Value
Assets:
Cash and cash equivalents, fair value	188,617	897,850
Escrow deposits and restricted cash	53,934	59,383
Derivative instruments	11,928	53,100
Liabilities:
Senior notes payable and other debt, gross, fair value	12,838,914	13,411,066
Derivative instruments	7,875	5,887
Redeemable OP Units, fair value	235,964	200,420
Fair Value | Non-mortgage loans receivable, net
Assets:
Non-mortgage loans receivable, fair value	20,227	27,640
Fair Value | Secured/mortgage loans and other, net
Assets:
Secured mortgage loans and other, net, fair value	$ 183,309	$ 146,229