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Property, net - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 14, 2016
Jan. 06, 2016
Mar. 31, 2016
Mar. 31, 2015
Property, Plant and Equipment [Line Items]        
Depreciation expenses     $ 69,903 $ 90,197
Gain on sale or write down of assets, net     (5)  
Land sales     2,412 1,056
Adjustment to contingent consideration     (12,294)  
Loss on Sale or Write-Down of Assets       (121)
Development cost     696  
Gain on sale or write down of assets, net     434,456 $ 935
Arrowhead Towne Center        
Property, Plant and Equipment [Line Items]        
Gain on sale or write down of assets, net     $ 104,293  
Ownership interest sold (as a percent)   40.00% 40.00%  
MAC Heitman Portfolio        
Property, Plant and Equipment [Line Items]        
Gain on sale or write down of assets, net $ 340,741      
Ownership interest sold (as a percent) 49.00%