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Dispositions (Narratives) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 0 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Feb. 24, 2014
Retail Properties Segment [Member]
Retail NY Hicksville (Broadway Mall) [Member]
Jul. 08, 2014
Retail Properties Segment [Member]
Retail CA Los Angeles Beverly Connection [Member]
Subsequent Event [Member]
sqft
Mar. 02, 2014
Retail Properties Segment [Member]
Retail Springfield Mall [Member]
sqft
Mar. 31, 2014
Retail Properties Segment [Member]
Retail Springfield Mall [Member]
Mar. 02, 2014
Retail Properties Segment [Member]
Retail Springfield Mall [Member]
Pennsylevenia Real Estate Investment Trust [Member]
Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]              
Gross proceeds from the sale of real estate     $ 94,000 $ 260,000 $ 465,000    
Net proceeds from the sale of real estate     92,174        
Square Footage Of Real Estate Property       335,000 1,350,000    
Net gains on sale of real estate       44,000      
Cash proceeds from the sale of real estate       239,000 340,000    
Mortgage loan receivable       21,000      
Mortgage loan receivable maturity tenure       10 years      
Operating Partnership Units Value Received From Buyer             125,000
Impairment losses $ 20,842 $ 4,007       $ 20,000