Quarterly report pursuant to Section 13 or 15(d)

Properties, Net (Details 2)

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Properties, Net (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Properties    
Projects in development or held for future development $ 410,850 $ 403,494
Projects in development or held for future development    
Properties    
Projects in development or held for future development 410,850 403,494
Projects in development or held for future development | Land    
Properties    
Projects in development or held for future development 220,468 240,825
Projects in development or held for future development | Development in progress, excluding land    
Properties    
Projects in development or held for future development $ 190,382 $ 162,669