FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Financial Assets [Abstract]
Cash and Cash Equivalents, at Carrying Value		$ 1,831	$ 374	$ 37	$ 16
Fair Value [Member]
Financial Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure		1,831	374
Mortgage loans receivable		2,587	2,571
Interest rate swap assets		4,497	6,701
Financial Liabilities [Abstract]
Unsecured bank credit facilities - variable rate	[1]	133,272	196,423
Unsecured debt Fair Value Disclosure	[1]	810,450	718,364
Secured debt	[1]	188,463	191,742
Interest rate swap liabilities		109	0
Carrying Amount [Member]
Financial Assets [Abstract]
Cash and Cash Equivalents, at Carrying Value	[2]	1,831	374
Mortgage loans receivable	[2]	2,591	2,594
Interest rate swap assets	[2]	4,497	6,701
Financial Liabilities [Abstract]
Unsecured bank credit facilities - variable rate	[1],[2]	132,868	195,730
Unsecured debt Fair Value Disclosure	[1],[2]	805,000	725,000
Secured debt	[1],[2]	186,116	189,038
Interest rate swap liabilities	[2]	$ 109	$ 0

[1] Carrying amounts and fair values shown in the table exclude debt issuance costs (see Note 10 for additional information).

[2] Carrying amounts shown in the table are included on the Consolidated Balance Sheets under the indicated captions, except as explained in the notes below. (2) Carrying amounts and fair values shown in the table exclude debt issuance costs (see Note 10 for additional information).
The following methods and assumptions were used to estimate the fair value of each class of financial instruments:
Cash and cash equivalents:  The carrying amounts approximate fair value due to the short maturity of those instruments. Mortgage loans receivable (included in Other assets on the Consolidated Balance Sheets):  The fair value is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities (Level 2 input). Interest rate swap assets (included in Other assets on the Consolidated Balance Sheets): The instruments are recorded at fair value based on models using inputs, such as interest rate yield curves, LIBOR swap curves and OIS curves, observable for substantially the full term of the contract (Level 2 input). See Note 14 for additional information on the Company’s interest rate swaps. Unsecured bank credit facilities: The fair value of the Company’s unsecured bank credit facilities is estimated by discounting expected cash flows at current market rates (Level 2 input), excluding the effects of debt issuance costs. Unsecured debt:  The fair value of the Company’s unsecured debt is estimated by discounting expected cash flows at the rates currently offered to the Company for debt of the same remaining maturities, as advised by the Company’s bankers (Level 2 input), excluding the effects of debt issuance costs. Secured debt: The fair value of the Company’s secured debt is estimated by discounting expected cash flows at the rates currently offered to the Company for debt of the same remaining maturities, as advised by the Company’s bankers (Level 2 input), excluding the effects of debt issuance costs. Interest rate swap liabilities (included in Other liabilities on the Consolidated Balance Sheets): The instruments are recorded at fair value based on models using inputs, such as interest rate yield curves, LIBOR swap curves and OIS curves, observable for substantially the full term of the contract (Level 2 input). See Note 14 for additional information on the Company’s interest rate swaps.