Quarterly report pursuant to Section 13 or 15(d)

Properties, Net (Details 2)

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Properties, Net (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Properties    
Projects in development or held for future development $ 422,905 $ 403,494
Projects in development or held for future development    
Properties    
Projects in development or held for future development 422,905 403,494
Projects in development or held for future development | Land in development or held for future development    
Properties    
Projects in development or held for future development 232,758 240,825
Projects in development or held for future development | Development in progress, excluding land    
Properties    
Projects in development or held for future development $ 190,147 $ 162,669