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Discontinued Operations (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Feb. 29, 2012
Apr. 30, 2011
Mar. 31, 2012
Industrial Properties [Member]
Dec. 31, 2011
Industrial Properties [Member]
Mar. 31, 2012
Retail Properties [Member]
Dec. 31, 2011
Retail Properties [Member]
Apr. 30, 2012
Wholly-Owned Industrial Properties [Member]
Mar. 31, 2012
Texas [Member]
Dec. 31, 2011
Texas [Member]
Industrial Properties [Member]
Mar. 31, 2012
Texas [Member]
Retail Properties [Member]
Dec. 31, 2011
Texas [Member]
Retail Properties [Member]
Mar. 31, 2012
Georgia [Member]
Dec. 31, 2011
Georgia [Member]
Industrial Properties [Member]
Dec. 31, 2011
Kansas [Member]
Retail Properties [Member]
Mar. 31, 2012
Florida [Member]
Dec. 31, 2011
Florida [Member]
Retail Properties [Member]
Mar. 31, 2012
Arizona [Member]
Dec. 31, 2011
Arizona [Member]
Retail Properties [Member]
Mar. 31, 2012
Illinois [Member]
Dec. 31, 2011
Illinois [Member]
Retail Properties [Member]
Mar. 31, 2012
North Carolina [Member]
Retail Properties [Member]
Dec. 31, 2011
North Carolina [Member]
Retail Properties [Member]
Mar. 31, 2012
Virginia [Member]
Mar. 31, 2012
Tennessee [Member]
Discontinued Operations [Line Items]                                                      
Ownership percentage in joint ventures 75.00%     47.80% 50.00%                                            
Number of properties held for sale 60   7     53   7 7 52 43     3 6     6 1 1 1 1 1   1 2 1
Number of operating properties sold             3 4 8     1 3 5   2 1   1         1 1    
Revenue from discontinued operations $ 15,179,000 $ 17,019,000                                                  
Gross property included in discontinued operations     558,200,000                                                
Property classified as held for sale, gross 536,600,000   94,800,000                                                
Accumulated depreciation for property held for sale 122,200,000                                                    
Property held for sale, net 414,413,000   73,241,000                                                
Accumulated depreciation for property included in discontinued operations     $ 129,000,000                                                
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.