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Property: (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Property, Plant and Equipment [Line Items]          
Land $ 1,716,154   $ 1,716,154   $ 1,707,005
Buildings and improvements 6,508,046   6,508,046   6,555,212
Tenant improvements 539,313   539,313   537,754
Equipment and furnishings 155,094   155,094   152,198
Construction in progress 285,816   285,816   229,169
Total 9,204,423   9,204,423   9,181,338
Less accumulated depreciation (1,648,359)   (1,648,359)   (1,559,572)
Property, net 7,556,064   7,556,064   7,621,766
Depreciation expenses 68,017 65,737 136,495 131,633  
Impairment loss 8,516   8,516    
(Loss) gain on remeasurement, sale or write down of assets, net (9,455) (798) (11,065) 4,030  
Gain on the sale of assets 238   238 5,401  
Write off of development cost (1,177) (798) (1,102) (1,371)  
Rotterdam Square
          
Property, Plant and Equipment [Line Items]          
(Loss) gain on remeasurement, sale or write down of assets, net     $ (1,685)    
Property area (in square feet) 585,000   585,000    
Somersville Town Center
          
Property, Plant and Equipment [Line Items]          
Property area (in square feet) 348,000   348,000    
Lake Square Mall
          
Property, Plant and Equipment [Line Items]          
Property area (in square feet) 559,000   559,000