FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Financial Assets [Abstract]
Escrow deposits for 1031 exchange	$ 698		$ 0
Cash and Cash Equivalents	11		8		1,258	174
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Financial Assets [Abstract]
Escrow deposits for 1031 exchange	698	[1]	0	[1]
Cash and Cash Equivalents	11	[1]	8	[1]
Mortgage loans receivable, net of discount	4,991	[1]	8,870	[1]
Interest Rate Swap Assets	812	[1]	1,692	[1]
Financial Liabilities [Abstract]
Secured debt	453,776	[1]	499,793	[1]
Unsecured debt	380,000	[1]	305,000	[1]
Unsecured bank credit facilities	99,401	[1]	88,952	[1]
Interest rate swap liabilities	3,314	[1]	244	[1]
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial Assets [Abstract]
Cash and cash equivalents	11		8
Escrow deposits for 1031 exchange	698		0
Mortgage loans receivable, net of discount	5,055		9,040
Interest Rate Swap Assets	812		1,692
Financial Liabilities [Abstract]
Secured debt	478,659		519,390
Unsecured debt	380,082		294,860
Unsecured bank credit facilities	99,638		89,140
Interest rate swap liabilities	$ 3,314		$ 244

[1] Carrying amounts shown in the table are included in the Consolidated Balance Sheets under the indicated captions, except as indicated in the notes below.