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Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) ft² Land_Parcels Buildings payments | Oct. 20, 2016 | Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
Other Liabilities |  | $ 450,821 |  | $ 483,601
Investments in unconsolidated joint ventures |  | 775,198 |  | 235,224
Investments In Affiliates Subsidiaries Associates And Joint Ventures net | [1] | 753,111 |  | 210,023
Unconsolidated Joint Ventures [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Other Liabilities |  | $ 22,100 |  | 25,200
Square 407 Limited Partnership [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Properties |  | Market Square North |  |
Ownership Percentage |  | 50.00% |  |
Other Liabilities | [1] | $ 8,134 |  | 9,951
BP/CRF Metropolitan Square LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Properties |  | Metropolitan Square |  |
Ownership Percentage | [2] | 20.00% |  |
Investments in unconsolidated joint ventures | [1] | $ 2,004 |  | 9,179
ownership interest sold (percent) |  |  | 31.00% |
BP/CRF 901 New York Avenue LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Properties |  | 901 New York Avenue |  |
Ownership Percentage | [3] | 25.00% |  |
Other Liabilities | [1] | $ 10,564 |  | 11,958
WP Project Developer LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Properties |  | Wisconsin Place Land and Infrastructure |  |
Ownership Percentage | [4] | 33.30% |  |
Investments in unconsolidated joint ventures | [1] | $ 41,605 |  | 43,524
Annapolis Junction NFM, LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Properties |  | Annapolis Junction |  |
Ownership Percentage | [5] | 50.00% |  |
Investments in unconsolidated joint ventures | [1] | $ 20,539 |  | 29,009
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% |  |
Investments in unconsolidated joint ventures | [1] | $ 67,816 |  | 68,983
500 North Capitol LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Properties |  | 500 North Capitol Street, NW |  |
Ownership Percentage |  | 30.00% |  |
Other Liabilities | [1] | $ 3,389 |  | 3,292
501 K Street LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Properties |  | 1001 6th Street |  |
Ownership Percentage | [6] | 50.00% |  |
Investments in unconsolidated joint ventures | [1] | $ 42,528 |  | 42,584
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% |  |
Investments in unconsolidated joint ventures | [1] | $ 29,869 |  | 18,508
Residential Tower Developer LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Properties |  | The Hub on Causeway - Residential |  |
Ownership Percentage |  | 50.00% |  |
Investments in unconsolidated joint ventures | [1] | $ 20,803 |  |
Hotel Tower Developer LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Properties |  | The Hub on Causeway - Hotel |  |
Ownership Percentage |  | 50.00% |  |
Investments in unconsolidated joint ventures | [1] | $ 933 |  |
Entity Owning Land And Infrastructure Of Project [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership Percentage |  | 33.30% |  |
1265 Main Office JV LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Properties |  | 1265 Main Street |  |
Ownership Percentage |  | 50.00% |  |
Investments in unconsolidated joint ventures | [1] | $ 4,779 |  | 11,916
BNY Tower Holdings LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Properties |  | Dock 72 at the Brooklyn Navy Yard |  |
Ownership Percentage | [7] | 50.00% |  |
Investments in unconsolidated joint ventures | [1] | $ 33,699 |  | $ 11,521
CA-Colorado Center Limited Partnership [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Properties |  | Colorado Center |  |
Ownership Percentage |  | 49.80% |  |
Investments in unconsolidated joint ventures | [1] | $ 510,623 |  |
[1] | Investments with deficit balances aggregating approximately $22.1 million and $25.2 million at December 31, 2016 and 2015, respectively, have been reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.
[2] | On October 20, 2016, the Company sold a 31% ownership interest in this joint venture.
[3] | The Company’s economic ownership has increased based on the achievement of certain return thresholds.
[4] | The Company’s wholly-owned entity that owns the office component of the project also owns a 33.3% interest in the entity owning the land, parking garage and infrastructure of the project.
[5] | The joint venture owns four in-service buildings and two undeveloped land parcels
[6] | 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.
[7] | This entity is a VIE (See Note 2).

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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References No definition available. + Details
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