FAIR VALUES OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets:
Cash and cash equivalents	$ 82,514	$ 72,277
Non-mortgage loans receivable, net	57,226	54,164
Debt securities, available-for-sale, carrying value	215,884	206,442
Liabilities:
Senior notes payable and other debt, gross	10,789,178
Redeemable OP Units, fair value	191,300	174,600
Non-Mortgage Loan Receivable
Assets:
Non-mortgage loans receivable, net	57,226	54,164
Non-mortgage loans receivable, fair value	57,373	54,081
Secured/mortgage loans and other, net
Assets:
Debt securities, held-to-maturity	439,462	439,491
Debt securities, held-to-maturity, fair value	424,664	425,290
Government-Sponsored Pooled Loan Investments
Assets:
Debt securities, available-for-sale, carrying value	56,882	56,378
Carrying Value
Assets:
Cash and cash equivalents	82,514	72,277
Derivative instruments	3,680	6,012
Liabilities:
Senior notes payable and other debt, gross	10,789,178	10,829,702
Derivative instruments	7,258	4,561
Redeemable OP Units, carrying amount	191,285	174,552
Carrying Value \| Non-Mortgage Loan Receivable
Assets:
Non-mortgage loans receivable, net	57,226	54,164
Carrying Value \| Secured/mortgage loans and other, net
Assets:
Debt securities, held-to-maturity	439,462	439,491
Carrying Value \| Senior unsecured notes
Assets:
Debt securities, available-for-sale, carrying value	215,884	206,442
Carrying Value \| Government-Sponsored Pooled Loan Investments
Assets:
Debt securities, available-for-sale, carrying value	56,882	56,378
Fair Value
Assets:
Cash and cash equivalents, fair value	82,514	72,277
Derivative instruments	3,680	6,012
Liabilities:
Senior notes payable and other debt, gross, fair value	10,897,452	10,617,074
Derivative instruments	7,258	4,561
Redeemable OP Units, fair value	191,285	174,552
Fair Value \| Non-Mortgage Loan Receivable
Assets:
Non-mortgage loans receivable, fair value	57,373	54,081
Fair Value \| Secured/mortgage loans and other, net
Assets:
Debt securities, held-to-maturity, fair value	424,664	425,290
Fair Value \| Senior unsecured notes
Assets:
Debt securities, available-for-sale, carrying value	215,884	206,442
Fair Value \| Government-Sponsored Pooled Loan Investments
Assets:
Debt securities, available-for-sale, carrying value	$ 56,882	$ 56,378

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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