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Summary of Significant Accounting Policies - Construction in Progress (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Construction in progress $ 53,485 $ 30,261
Park Van Ness    
Property, Plant and Equipment [Line Items]    
Construction in progress 48,371 26,998
Other    
Property, Plant and Equipment [Line Items]    
Construction in progress $ 5,114 $ 3,263