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Investment in unconsolidated Joint Ventures (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 06, 2019
USD ($)
ft²
yr
Sep. 20, 2019
USD ($)
ft²
a
Sep. 16, 2019
USD ($)
Sep. 05, 2019
USD ($)
ft²
yr
Jun. 27, 2019
USD ($)
ft²
Apr. 26, 2019
USD ($)
ft²
yr
Jan. 24, 2019
USD ($)
ft²
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Nov. 22, 2019
ft²
Oct. 01, 2019
ft²
apartments
May 28, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]                            
Mortgage notes payable, net               $ 2,922,408 $ 2,922,408 $ 2,964,572        
Payments to Acquire Equity Method Investments                 87,392 $ 345,717 $ 109,015      
Annapolis Junction Building Six [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Ownership Percentage             50.00%              
Mortgage notes payable, net             $ 13,000              
Extension Option (in years)             1              
Debt instrument, borrowing capacity             $ 14,300              
Debt Instrument, Basis Spread on Variable Rate             2.00%              
Net Rentable Area (in sf) | ft²             119,000              
7750 Wisconsin Avenue [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Ownership Percentage           50.00%                
Extension Option (in years) | yr           1                
Proceeds from Construction Loans Payable                 $ 64,500          
Debt Instrument, Basis Spread on Variable Rate           1.25%                
Net Rentable Area (in sf) | ft²           734,000                
Construction Loan Facility Borrowing Capacity           $ 255,000                
Number of extensions           2                
The Hub on Causeway - Podium and 100 Causeway Street [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Ownership Percentage                           50.00%
Maximum proceeds from a state infrastructure development program                           $ 30,000
Net proceeds from a state infrastructure development program     $ 28,800                      
Hub on Causeway - Podium [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Net Rentable Area (in sf) | ft²                       382,000    
Repayments of Construction Loans Payable     $ 28,800                      
540 Madison Avenue [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Ownership Percentage         60.00%     60.00% [1] 60.00% [1]          
Debt Instrument, Basis Spread on Variable Rate         1.10%                  
Net Rentable Area (in sf) | ft²         284,000                  
Contractual Sales Price         $ 310,300                  
Loans Assumed         120,000                  
Proceeds from Sale of Equity Method Investments         178,700                  
Gain on sale of investment in unconsolidated joint venture                 $ 47,200          
100 Causeway Street [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Ownership Percentage       50.00%       50.00% 50.00%          
Extension Option (in years) | yr       1                    
Proceeds from Construction Loans Payable               $ 81,100            
Debt Instrument, Basis Spread on Variable Rate       1.50%                    
Net Rentable Area (in sf) | ft²       632,000                    
Construction Loan Facility Borrowing Capacity       $ 400,000                    
Number of extensions       2                    
Platform 16                            
Schedule of Equity Method Investments [Line Items]                            
Ownership Percentage   55.00%           55.00% [2] 55.00% [2]          
Net Rentable Area (in sf) | ft²   1,100,000                        
Lessee, Finance Lease, Term of Contract   65 years                        
Area of Land | a   5.6                        
Payments to Acquire Equity Method Investments   $ 28,200                        
Dock 72 [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Ownership Percentage                         50.00%  
Net Rentable Area (in sf) | ft²                         670,000  
Annapolis Junction building seven and eight [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Ownership Percentage 50.00%                          
Mortgage notes payable, net $ 34,800                          
Extension Option (in years) | yr 1                          
Debt Instrument, Basis Spread on Variable Rate 2.35%                          
Number of extensions 3                          
Annapolis Junction Building Seven [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Net Rentable Area (in sf) | ft² 127,000                          
Annapolis Junction Building Eight [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Net Rentable Area (in sf) | ft² 126,000                          
Joint Venture Partner [Member] | Platform 16                            
Schedule of Equity Method Investments [Line Items]                            
Ownership Percentage   45.00%                        
Payments to Acquire Equity Method Investments   $ 23,100                        
Residential Properties [Member] | Hub50House [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Ownership Percentage                         50.00%  
Net Rentable Area (in sf) | ft²                         320,000  
Number of Units in Real Estate Property | apartments                         440  
Company's Share [Member] | 540 Madison Avenue [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Proceeds from Sale of Equity Method Investments         $ 107,100                  
Stabilization as defined in the agreement [Member] | 100 Causeway Street [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Debt Instrument, Basis Spread on Variable Rate       1.375%                    
[1]
The property was sold on June 27, 2019. As of December 31, 2019, the investment is comprised of undistributed cash. See note below for additional details.
[2]
This entity is a VIE (See Note 1).