FAIR VALUES OF FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets:
Unsecured loans receivable, net	$ 41,365	$ 38,542
Liabilities:
Redeemable OP unitholder interests	123,600	111,600
Carrying Amount
Assets:
Cash and cash equivalents	86,635	94,816
Secured loans receivable, net	353,089	354,775
Unsecured loans receivable, net	41,365	38,542
Marketable securities	109,044	21,454
Liabilities:
Senior notes payable and other debt, gross	9,576,777	9,320,477
Derivative instruments and other liabilities	10,993	11,105
Redeemable OP unitholder interests	123,609	111,607
Fair Value
Assets:
Cash and cash equivalents	86,635	94,816
Secured loans receivable, net	352,211	355,223
Unsecured loans receivable, net	42,031	40,473
Marketable securities	109,044	21,454
Liabilities:
Senior notes payable and other debt, gross	9,874,595	9,405,259
Derivative instruments and other liabilities	10,993	11,105
Redeemable OP unitholder interests	$ 123,609	$ 111,607