FAIR VALUES OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets:
Cash and cash equivalents	$ 81,987	$ 72,277
Non-mortgage loans receivable, net	59,570	54,164
Debt securities, available-for-sale, carrying value	230,618	206,442
Liabilities:
Senior notes payable and other debt, gross	10,346,903
Redeemable OP Units, fair value	204,900	174,600
Non-Mortgage Loan Receivable
Assets:
Non-mortgage loans receivable, net	59,570	54,164
Non-mortgage loans receivable, fair value	57,669	54,081
Secured/mortgage loans and other, net
Assets:
Debt securities, held-to-maturity	637,860	439,491
Debt securities, held-to-maturity, fair value	638,072	425,290
Government-Sponsored Pooled Loan Investments
Assets:
Debt securities, available-for-sale, carrying value	55,791	56,378
Carrying Value
Assets:
Cash and cash equivalents	81,987	72,277
Derivative instruments	1,992	6,012
Liabilities:
Senior notes payable and other debt, gross	10,346,903	10,829,702
Derivative instruments	21,870	4,561
Redeemable OP Units, carrying amount	204,895	174,552
Carrying Value \| Non-Mortgage Loan Receivable
Assets:
Non-mortgage loans receivable, net	59,570	54,164
Carrying Value \| Secured/mortgage loans and other, net
Assets:
Debt securities, held-to-maturity	637,860	439,491
Carrying Value \| Marketable debt securities
Assets:
Debt securities, available-for-sale, carrying value	230,618	206,442
Carrying Value \| Government-Sponsored Pooled Loan Investments
Assets:
Debt securities, available-for-sale, carrying value	55,791	56,378
Fair Value
Assets:
Cash and cash equivalents, fair value	81,987	72,277
Derivative instruments	1,992	6,012
Liabilities:
Senior notes payable and other debt, gross, fair value	10,770,652	10,617,074
Derivative instruments	21,870	4,561
Redeemable OP Units, fair value	204,895	174,552
Fair Value \| Non-Mortgage Loan Receivable
Assets:
Non-mortgage loans receivable, fair value	57,669	54,081
Fair Value \| Secured/mortgage loans and other, net
Assets:
Debt securities, held-to-maturity, fair value	638,072	425,290
Fair Value \| Marketable debt securities
Assets:
Debt securities, available-for-sale, carrying value	230,618	206,442
Fair Value \| Government-Sponsored Pooled Loan Investments
Assets:
Debt securities, available-for-sale, carrying value	$ 55,791	$ 56,378

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