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Discontinued Operations (Details) (USD $)
3 Months Ended9 Months Ended9 Months Ended12 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Mar. 31, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Sep. 30, 2011
Texas [Member]
Sep. 30, 2011
Texas [Member]
Retail Properties [Member]
Dec. 31, 2010
Texas [Member]
Retail Properties [Member]
Sep. 30, 2011
Texas [Member]
Industrial Properties [Member]
Sep. 30, 2011
Georgia [Member]
Sep. 30, 2011
Georgia [Member]
Industrial Properties [Member]
Sep. 30, 2011
Retail Properties [Member]
Kansas [Member]
Sep. 30, 2011
Florida [Member]
Sep. 30, 2011
Arizona [Member]
Sep. 30, 2011
Illinois [Member]
Sep. 30, 2011
North Carolina [Member]
Sep. 30, 2011
Industrial Buildings [Member]
Sep. 30, 2011
Retail Buildings [Member]
Sep. 30, 2011
Undeveloped Land Parcels [Member]
Sep. 30, 2011
Industrial Properties [Member]
Sep. 30, 2011
Retail Properties [Member]
Discontinued Operations [Line Items]                      
Number of properties held for sale   11  4   1  3111     
Number of operating properties sold  2    211 11    11823
Revenue from discontinued operations$ 4,800,000$ 4,900,000 $ 14,700,000$ 14,700,000                 
Property Held for Sale, net122,360,000  122,360,000                  
Gross property included in discontinued operations     41,900,000                
Accumulated depreciation for property included in discontinued operations     10,300,000                
Impairment loss included in discontinued operations14,800,0000 17,700,0000                 
Interest expense allocated to discontinued operations   

We do not allocate other consolidated interest to discontinued operations because the interest savings to be realized from the proceeds of the sale of these operations is not material.

                  
Gain on acquisition   $ 4,559,000