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Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details)
$ in Thousands
9 Months Ended
Jul. 13, 2018
ft²
Sep. 30, 2018
USD ($)
ft²
Land_Parcels
Buildings
payments
Jul. 27, 2018
ft²
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]        
Carrying Value of investment   $ (468,433)   $ (443,980)
Carrying value of the Company's investments in unconsolidated joint ventures   $ 925,431   619,925
Square 407 Limited Partnership [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   Market Square North    
Ownership Percentage   50.00%    
Carrying Value of investment [1]   $ (6,870)   (8,258)
The Metropolitan Square Associates LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   Metropolitan Square    
Ownership Percentage   20.00%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 1,220   3,339
BP/CRF 901 New York Avenue LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   901 New York Avenue    
Ownership Percentage [2]   25.00%    
Carrying Value of investment [1]   $ (12,454)   (13,811)
WP Project Developer LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   Wisconsin Place Land and Infrastructure    
Ownership Percentage [3]   33.30%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 38,667   39,710
Annapolis Junction NFM, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   Annapolis Junction    
Ownership Percentage [4]   50.00%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 17,309   18,381
Number of real estate properties | Buildings   4    
Parcels of undeveloped land | Land_Parcels   2    
540 Madison Venture LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   540 Madison Avenue    
Ownership Percentage   60.00%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 66,492   66,179
500 North Capitol Venture LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   500 North Capitol Street, NW    
Ownership Percentage   30.00%    
Carrying Value of investment [1]   $ (4,699)   (3,876)
501 K Street LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   1001 6th Street    
Ownership Percentage [5]   50.00%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 42,584   42,657
Potential additonal payments to joint venture partner | payments   2    
Minimum square footage to make a potential additional payment to joint venture partner (in sqft) | ft²   520,000    
Podium Developer LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   The Hub on Causeway - Podium    
Ownership Percentage   50.00%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 68,919   67,120
Residential Tower Developer LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   The Hub on Causeway - Residential    
Ownership Percentage   50.00%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 46,655   28,212
Hotel Tower Developer LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   The Hub on Causeway - Hotel Air Rights    
Ownership Percentage   50.00%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 2,738   1,690
Office Tower Developer LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   100 Causeway Street    
Ownership Percentage   50.00% [6] 50.00%  
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 12,232   0
Net Rentable Area (in sf) | ft²     627,000  
1265 Main Office JV LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   1265 Main Street    
Ownership Percentage   50.00%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 4,313   4,641
BNY Tower Holdings LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   Dock 72    
Ownership Percentage   50.00%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 72,100   72,104
CA-Colorado Center Limited Partnership [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   Colorado Center    
Ownership Percentage   50.00%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 253,334   254,440
7750 Wisconsin Avenue LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   7750 Wisconsin Avenue    
Ownership Percentage [6]   50.00%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 69,007   21,452
BP-M 3HB Venture LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 3.50%      
Properties   3 Hudson Boulevard    
Ownership Percentage 25.00% 25.00%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 46,240   0
Net Rentable Area (in sf) | ft² 2,000,000.0      
SMBP Venture LP [Member]        
Schedule of Equity Method Investments [Line Items]        
Properties   Santa Monica Business Park    
Ownership Percentage   55.00%    
Carrying value of the Company's investments in unconsolidated joint ventures [1]   $ 183,621   0
Unconsolidated Joint Ventures [Member]        
Schedule of Equity Method Investments [Line Items]        
Carrying Value of investment   24,000   25,900
Unconsolidated Joint Ventures [Member]        
Schedule of Equity Method Investments [Line Items]        
Carrying Value of investment   (589,394)   (99,215)
Carrying value of the Company's investments in unconsolidated joint ventures [1],[7]   $ 901,408   $ 593,980
[1] Investments with deficit balances aggregating approximately $24.0 million and $25.9 million at September 30, 2018 and December 31, 2017, respectively, have been reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.
[2] The Company’s economic ownership has increased based on the achievement of certain return thresholds.
[3] The Company’s wholly-owned subsidiary that owns Wisconsin Place Office also owns a 33.3% interest in the joint venture entity that owns the land, parking garage and infrastructure of the project.
[4] The joint venture owns four in-service buildings and two undeveloped land parcels.
[5] Under the joint venture agreement for this land parcel, the partner will be entitled to up to two additional payments from the venture based on increases in total entitled square footage of the project above 520,000 square feet and achieving certain project returns at stabilization.
[6] This entity is a VIE (See Note 2 to the Consolidated Financial Statements).
[7] Investments with deficit balances aggregating approximately $24.0 million and $25.9 million at September 30, 2018 and December 31, 2017, respectively, have been reflected within Other Liabilities in the Company’s Consolidated Balance Sheet