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FAIR VALUE MEASUREMENTS (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Available-for-sale securities
Total cost of available-for-sale securities	$ 150,000
Unrealized gain on available-for-sale securities	129,000
Unrealized losses on available-for-sale securities	1,000
Aggregate net unrealized gain on available-for-sale securities	128,000
Gross proceeds of available-for-sale securities	373,000		6,345,000
Net realized gain on available-for-sale securities	9,000		149,000
Impairment charge on available-for-sale securities		126,000
Recurring | Carrying and fair Value
Available-for-sale securities:
Equity securities	278,000	631,000
Financial liabilities:
Derivative financial instruments	1,470,000	923,000
Recurring | Level 1
Available-for-sale securities:
Equity securities	278,000	631,000
Recurring | Level 2
Financial liabilities:
Derivative financial instruments	1,470,000	923,000
Corporate bonds investment available for sale
Available-for-sale securities
Number of corporate bonds sold			3
Gross proceeds of available-for-sale securities			2,356,000
Mortgages and loan payable
Fair Value of Financial Instruments
Estimated fair value of debt instrument	233,170,000	208,355,000
Excess of fair value over carrying value	$ 7,199,000	$ 10,418,000
Blended or estimated market interest rate (as a percent)	4.80%	4.50%
Weighted average remaining term of the mortgages	9 years 2 months 12 days	4 years 9 months

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