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Properties Held for Sale and Property Dispositions (Details)
$ in Thousands
1 Months Ended 9 Months Ended
Aug. 31, 2019
USD ($)
ft²
Sep. 30, 2019
USD ($)
ft²
Sep. 30, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Approximate Square Feet | ft²   29,540,006  
Fair value adjustment recognition   $ 69,389 $ 57,385
220 East 42nd Street      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Sales Price   815,000  
1010 Washington Boulevard      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Impairment charge   7,000  
Sales Price   $ 23,100  
115 Spring Street      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Approximate Square Feet | ft² 5,218    
Sales Price $ 66,600    
Gain (loss) $ 3,600    
Ownership percentage in disposed asset 49.00%    
Deconsolidation of ownership interest, percentage 51.00%    
Fair value adjustment recognition $ 3,800