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Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
ft²
Land_Parcels
Buildings
payments
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]    
Mortgage notes payable, net $ 2,972,052 $ 2,979,281
Carrying Value of investment (462,869) (443,980)
Carrying value of the Company's investments in unconsolidated joint ventures $ 682,507 619,925
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] $ (7,371) (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] $ 4,628 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] $ (12,824) (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] $ 39,015 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] $ 17,597 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] $ 66,385 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] $ (4,416) (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] $ 42,646 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  
Ownership Percentage 50.00%  
Carrying value of the Company's investments in unconsolidated joint ventures [1] $ 72,900 67,120
Residential Tower Developer LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties The Hub on Causeway - Residential  
Ownership Percentage [6] 50.00%  
Carrying value of the Company's investments in unconsolidated joint ventures [1] $ 38,958 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] $ 2,046 1,690
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] $ 4,413 4,641
BNY Tower Holdings LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Properties Dock 72 at the Brooklyn Navy Yard  
Ownership Percentage 50.00%  
Carrying value of the Company's investments in unconsolidated joint ventures [1] $ 71,651 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] $ 253,864 254,440
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] $ 68,404 21,452
Unconsolidated Joint Ventures [Member]    
Schedule of Equity Method Investments [Line Items]    
Carrying Value of investment 24,600 25,900
Unconsolidated Joint Ventures [Member]    
Schedule of Equity Method Investments [Line Items]    
Mortgage notes payable, net 1,524,951 1,437,440
Carrying Value of investment (126,179) (99,215)
Carrying value of the Company's investments in unconsolidated joint ventures [1],[7] $ 657,896 $ 593,980
[1] Investments with deficit balances aggregating approximately $24.6 million and $25.9 million at June 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).
[7] Investments with deficit balances aggregating approximately $24.6 million and $25.9 million at June 30, 2018 and December 31, 2017, respectively, have been reflected within Other Liabilities in the Company’s Consolidated Balance Sheet