FAIR VALUES OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets:
Non-mortgage loans receivable, net	$ 54,630	$ 52,544
Liabilities:
Redeemable OP unitholder interests	160,500	177,200
Government-sponsored pooled loan investments
Assets:
Derivative instruments	55,244	55,049
Carrying Amount
Assets:
Cash and cash equivalents	91,284	286,707
Secured mortgage loans and other	1,343,173	646,972
Non-mortgage loans receivable, net		52,544
Liabilities:
Senior notes payable and other debt, gross	12,020,558	11,190,914
Derivative instruments	3,049	2,316
Redeemable OP unitholder interests	160,475	177,177
Carrying Amount \| Government-sponsored pooled loan investments
Assets:
Derivative instruments	55,244	55,049
Carrying Amount \| Derivative instruments
Assets:
Derivative instruments	3,445	3,302
Fair Value
Assets:
Cash and cash equivalents	91,284	286,707
Secured mortgage loans and other	1,361,388	655,981
Non-mortgage loans receivable, net	55,218	53,626
Liabilities:
Senior notes payable and other debt, gross	12,173,575	11,369,440
Derivative instruments	3,049	2,316
Redeemable OP unitholder interests	160,475	177,177
Fair Value \| Government-sponsored pooled loan investments
Assets:
Derivative instruments	55,244	55,049
Fair Value \| Derivative instruments
Assets:
Derivative instruments	$ 3,445	$ 3,302

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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