FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Financial Assets:
Cash and Cash Equivalents, at Carrying Value	$ 24	$ 1,258	$ 205	$ 174
Carrying Amount [Member]
Financial Assets:
Cash and Cash Equivalents, at Carrying Value	24	1,258
Mortgage loans receivable, net of discount	9,300	9,323
Financial Liabilities:
Mortgage notes payable	601,655	607,766
Unsecured term loans payable	130,000	130,000
Notes payable to banks	91,595	76,160
Interest rate swap liability	414	645
Fair Value [Member]
Financial Assets:
Cash and Cash Equivalents, Fair Value Disclosure	24	1,258
Mortgage loans receivable, net of discount	9,760	9,748
Financial Liabilities:
Mortgage notes payable	648,135	661,408
Unsecured term loans payable	131,747	130,776
Notes payable to banks	91,698	76,160
Interest rate swap liability	$ 414	$ 645