UNCONSOLIDATED INVESTMENT (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Year Constructed	1998
Investment's carrying value under the equity method of accounting	$ 2,764,000		$ 2,743,000
Non-recourse first mortgage loan Face Amount, Total mortgage	8,894,000
Mortgage loans on real estate, joint interest share of mortgage	8,870,000	[1],[2]
Industry Distribution Center II - undivided tenant [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage (in hundredths)	50.00%
Real estate properties (in square feet)	309,000
Building lease percentage	100.00%
Investment's carrying value under the equity method of accounting	2,764,000		2,743,000
Non-recourse first mortgage loan Face Amount, Total mortgage	13,300,000
Non-recourse first mortgage loan term	25 years
Non-recourse first mortgage loan interest rate	5.31%
Non Recourse First Mortgage Loan Lender Call Option Date	June 30, 2015
Mortgage loans on real estate, joint interest share of mortgage	$ 5,280,000		$ 5,475,000
Industry Distribution Center II [Member]
Schedule of Equity Method Investments [Line Items]
Single tenant joint partner ownership (in hundredths)	50.00%

[1] Changes in mortgage loans follow: Years Ended December 31,2013 2012 2011(In thousands)Balance at beginning of year$9,323 4,110 4,131Advances on mortgage loans receivable— 5,223 —Payments on mortgage loans receivable(463) (20) (33)Amortization of discount on mortgage loan receivable10 10 12Balance at end of year$8,870 9,323 4,110

[2] The aggregate cost for federal income tax purposes is approximately $8.89 million. The federal income tax return for the year ended December 31, 2013, has not been filed and, accordingly, the income tax basis of mortgage loans as of December 31, 2013, is based on preliminary data.