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Organization (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 21, 2016
USD ($)
Apr. 28, 2016
Property
Properties
Jan. 03, 2016
USD ($)
Feb. 03, 2015
Sep. 30, 2016
USD ($)
ft²
Property
Properties
Jun. 30, 2016
Properties
Sep. 30, 2016
USD ($)
ft²
Property
Properties
Sep. 30, 2015
USD ($)
Properties
Dec. 31, 2015
Properties
Entity Information [Line Items]                  
Number of real estate properties         74   74 142 129
Gross disposition price | $             $ 1,887,550 $ 53,275  
Retail [Member]                  
Entity Information [Line Items]                  
Number of real estate properties         73   73    
Square Footage | ft²         12,159,788   12,159,788    
Student Housing [Member]                  
Entity Information [Line Items]                  
Number of disposed assets | Property         1   1    
Gross disposition price | $     $ 1,410,000   $ 33,350   $ 33,350    
Proceeds from divestiture of businesses | $ $ 845,000                
Escrow related to post-closing obligations | $ 9,900                
Escrow held pending completion of a development project | $ $ 8,000                
Non-core [Member]                  
Entity Information [Line Items]                  
Number of real estate properties         1   1    
Square Footage | ft²         322,326   322,326    
Highlands Spin-off [Member]                  
Entity Information [Line Items]                  
Percent of outstanding shares of common stock included in spin-off (percent)   100.00%              
Xenia Hotels and Resorts, Inc. [Member]                  
Entity Information [Line Items]                  
Percent of outstanding shares of common stock included in spin-off (percent)       95.00%          
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Highlands Spin-off [Member]                  
Entity Information [Line Items]                  
Number of real estate properties   18     18   18    
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Xenia Hotels and Resorts, Inc. [Member]                  
Entity Information [Line Items]                  
Number of real estate properties         46   46    
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Student Housing Platform Sale [Member]                  
Entity Information [Line Items]                  
Number of real estate properties         17   17    
Correctional Facility [Member] | Highlands Spin-off [Member]                  
Entity Information [Line Items]                  
Number of real estate properties | Property   2              
Single and Multi-Tenant Office Building [Member] | Highlands Spin-off [Member]                  
Entity Information [Line Items]                  
Number of real estate properties | Property   7              
Industrial Asset [Member] | Highlands Spin-off [Member]                  
Entity Information [Line Items]                  
Number of real estate properties | Property   2              
Retail [Member]                  
Entity Information [Line Items]                  
Number of disposed assets | Property             24    
Square Footage | ft²         3,098,800   3,098,800    
Gross disposition price | $             $ 442,900    
Retail [Member] | Highlands Spin-off [Member]                  
Entity Information [Line Items]                  
Number of real estate properties | Property   6              
Land [Member] | Highlands Spin-off [Member]                  
Entity Information [Line Items]                  
Number of real estate properties | Property   4              
Land [Member] | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Highlands Spin-off [Member]                  
Entity Information [Line Items]                  
Number of real estate properties   4              
Bank Branch [Member] | Highlands Spin-off [Member]                  
Entity Information [Line Items]                  
Number of real estate properties | Property   1              
Non-core [Member]                  
Entity Information [Line Items]                  
Number of disposed assets               4  
Non-core [Member] | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]                  
Entity Information [Line Items]                  
Number of real estate properties         1   1    
Number of disposed assets           1 1    
Gross disposition price | $             $ 1,300