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Co-Venture Arrangement: (Details)
ft² in Thousands, $ in Thousands
Sep. 30, 2009
USD ($)
ft²
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Co-Venture Arrangement:      
Co-venture obligation | $   $ 71,861 $ 75,450
Freehold Raceway Mall and Chandler Fashion Center      
Co-Venture Arrangement:      
Percentage of loan assumed by third party (as a percent) 49.90%    
Co-venture obligation | $ $ 168,154    
Freehold Raceway Mall      
Co-Venture Arrangement:      
Property area (in square feet) 1,668    
Chandler Fashion Center      
Co-Venture Arrangement:      
Property area (in square feet) 1,320