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Summary of Significant Accounting Policies - Construction in Progress (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Construction in progress $ 7,327 $ 83,516
Park Van Ness    
Property, Plant and Equipment [Line Items]    
Construction in progress 0 77,245
Other    
Property, Plant and Equipment [Line Items]    
Construction in progress $ 7,327 $ 6,271