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Real Estate - Redevelopment (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Real Estate Properties [Line Items]      
Properties under development or held for future development $ 27,313 $ 36,094  
7900 Westpark Drive [Member]      
Real Estate Properties [Line Items]      
Investment Building and Building Improvements 36,300   $ 25,900
Devonshire [Member]      
Real Estate Properties [Line Items]      
Properties under development or held for future development $ 16,100