Investments in Joint Ventures (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 sqft IndustrialProperty	Jun. 30, 2011	Jun. 30, 2012 sqft IndustrialProperty	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 2003 Net Lease Joint Venture [Member] sqft IndustrialProperty	Feb. 13, 2012 2003 Net Lease Joint Venture [Member] IndustrialProperty	May 26, 2011 2003 Net Lease Joint Venture [Member] IndustrialProperty	Jun. 30, 2012 2007 Europe Joint Venture [Member] IndustrialProperty
Investments in Joint Ventures (Textual) [Abstract]
Equity interest acquired							85.00%	85.00%
Number of industrial properties owned	667		667			6	1	1	0
Equity interest									10.00%
Gross Leasable Area (GLA) of industrial properties owned	58,300,000		58,300,000			3,100,000
Investment in 2003 Net Lease Joint Venture	$ 1,258		$ 1,258		$ 1,674	$ 1,258
Investments In Joint Ventures Other (Textual) [Abstract]
Receivables from joint ventures	22		22		137
Fees received from joint ventures	$ 68	$ 277	$ 144	$ 587