UNCONSOLIDATED INVESTMENT (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 sqft		Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Investment's carrying value under the equity method of accounting	$ 2,743		$ 2,757
Non-recourse first mortgage loan Face Amount, Total mortgage	9,357
Mortgage loans on real estate, joint interest share of mortgage	9,323	[1],[2]
Industry Distribution Center II - undivided tenant [Member]
Schedule of Equity Method Investments [Line Items]
Real estate properties (in square feet)	309,000
Building lease percentage	100.00%
Single tenant joint partner ownership (in hundredths)	50.00%
Investment's carrying value under the equity method of accounting	2,743		2,757
Non-recourse first mortgage loan Face Amount, Total mortgage	13,300
Non-recourse first mortgage loan term	25 years
Non-recourse first mortgage loan interest rate	5.31%
Non-recourse first mortgage Loan Maturity Date	June 30, 2015
Non Recourse First Mortgage Loan Lender Call Option Date	June 30, 2015
Mortgage loans on real estate, joint interest share of mortgage	$ 5,475		$ 5,660
Industry Distribution Center II [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage (in hundredths)	50.00%

[1] The aggregate cost for federal income tax purposes is approximately $9.36 million. The federal income tax return for the year ended December 31, 2012, has not been filed and, accordingly, the income tax basis of mortgage loans as of December 31, 2012, is based on preliminary data.

[2] Changes in mortgage loans follow: Years Ended December 31,2012 2011 2010(In thousands)Balance at beginning of year$4,110 4,131 4,155Advances on mortgage loans receivable5,223 — —Payments on mortgage loans receivable(20) (33) (37)Amortization of discount on mortgage loan receivable10 12 13Balance at end of year$9,323 4,110 4,131