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Related Party Arrangements (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Related Party Arrangements      
Compensation expense $ 3,154,000 $ 5,617,000  
Unconsolidated real estate entities
     
Related Party Arrangements      
Asset management, property management, development and redevelopment fee revenue 3,077,000 2,272,000  
Outstanding receivables 7,595,000   7,004,000
Non-employee directors | Restricted stock and deferred stock awards
     
Related Party Arrangements      
Compensation expense 156,000 256,000  
Amount of deferred compensation $ 167,000   $ 417,000