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Investments In Joint Ventures (Details Textual) (USD $)	2 Months Ended	12 Months Ended					3 Months Ended			12 Months Ended		12 Months Ended	1 Months Ended		12 Months Ended
	Feb. 28, 2012 sqft IndustrialProperty	Dec. 31, 2011 sqft IndustrialProperty SaleAsset	Dec. 31, 2010 SaleAsset	Dec. 31, 2009	Dec. 31, 2011 2003 Net Lease Joint Venture [Member] sqft IndustrialProperty	May 26, 2011 2003 Net Lease Joint Venture [Member]	Sep. 30, 2007 2007 Net Lease Joint Venture [Member] JointVentures	Dec. 31, 2011 2007 Net Lease Joint Venture [Member] IndustrialProperty	Dec. 31, 2011 2007 Europe Joint Venture [Member]	Dec. 31, 2010 2006 Net Lease Co-Investment Program [Member]	Mar. 21, 2006 2006 Net Lease Co-Investment Program [Member]	Dec. 31, 2010 2005 Development/Repositioning Joint Venture [Member]	Sep. 30, 2009 July 2007 Fund [Member] IndustrialProperty	Dec. 31, 2011 July 2007 Fund [Member]	Dec. 31, 2011 Discontinued Operation or Asset Disposal [Member] Corporate Joint Venture [Member]	Dec. 31, 2010 Discontinued Operation or Asset Disposal [Member] Corporate Joint Venture [Member]	Dec. 31, 2009 Discontinued Operation or Asset Disposal [Member] Corporate Joint Venture [Member]
Investment In Joint Ventures (Textual) [Abstract]
Gain on Sale of Real Estate		$ 1,370,000	$ 859,000	$ 374,000						$ 852,000					$ 3,137,000	$ 2,761,000	$ 1,177,000
Ownership Percentage					15.00%				10.00%		15.00%			0.00%
Ownership percentage purchased	85.00%	85.00%				85.00%
Industrial property owned		740			7			0
Gross Leasable Area (GLA) of industrial property owned	400,000	66,300,000			3,400,000
Investment in net lease joint venture					1,674,000
Purchase price of industrial property from joint venture		90,524,000	89,736,000	75,947,000								14,627,000
Number Of Properties Management Arrangement							3
Number of properties service termination													2
Net proceeds from sale of real estate property assets		75,953,000	68,046,000	74,982,000						4,541,000
Investments In Joint Ventures Other (Textual) [Abstract]
Proceeds from sale of joint venture			5,000,000
Unrealized loss related to sale of interest in joint venture			1,625,000
Gain on Sale of Joint Venture Interests			11,226,000
Number of sale assets closed			3
Gain on closing of sale assets			2,700,000
Received fee from the termination of the management agreement				866,000
Receivables from Joint Ventures		137,000	2,857,000
Fees received from joint ventures		$ 970,000	$ 4,952,000	$ 11,174,000

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