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Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) ft² Land_Parcels Buildings payments | Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated joint ventures |  | $ 235,224 | $ 193,394
Investments In Affiliates Subsidiaries Associates And Joint Ventures net | [1] | 210,023 | 182,042
Unconsolidated Joint Ventures [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in unconsolidated joint ventures |  | $ (25,200) | (11,400)
Square 407 Limited Partnership [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Properties |  | Market Square North |
Ownership Percentage |  | 50.00% |
Investments in unconsolidated joint ventures | [1] | $ (9,951) | (8,022)
The Metropolitan Square Associates LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Properties |  | Metropolitan Square |
Ownership Percentage |  | 51.00% |
Investments in unconsolidated joint ventures | [1] | $ 9,179 | 8,539
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% |
Investments in unconsolidated joint ventures | [1] | $ (11,958) | (1,080)
WP Project Developer LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Properties |  | Wisconsin Place Land and Infrastructure |
Ownership Percentage | [3] | 33.30% |
Investments in unconsolidated joint ventures | [1] | $ 43,524 | 45,514
Annapolis Junction NFM, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Properties |  | Annapolis Junction |
Ownership Percentage | [4] | 50.00% |
Number of real estate properties | Buildings |  | 4 |
Parcels of undeveloped land | Land_Parcels |  | 2 |
Investments in unconsolidated joint ventures | [1] | $ 29,009 | 25,246
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] | $ 68,983 | 68,128
500 North Capitol LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Properties |  | 500 North Capitol Street, NW |
Ownership Percentage |  | 30.00% |
Investments in unconsolidated joint ventures | [1] | $ (3,292) | (2,250)
501 K Street LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Properties |  | 1001 6th Street |
Ownership Percentage | [5] | 50.00% |
Investments in unconsolidated joint ventures | [1] | $ 42,584 | 41,736
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% |
Investments in unconsolidated joint ventures | [1] | $ 18,508 | $ 4,231
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] | $ 11,916 |
BNY Tower Holdings LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Properties |  | Dock72 at the Brooklyn Navy Yard |
Ownership Percentage |  | 50.00% |
Investments in unconsolidated joint ventures | [1] | $ 11,521 |
[1] | Investments with deficit balances aggregating approximately $25.2 million and $11.4 million at December 31, 2015 and 2014, respectively, have been reflected within Other Liabilities on 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 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.
[4] | The joint venture owns four in-service buildings and two undeveloped land parcels
[5] | Under the joint venture agreement, the partner may be entitled to up to two additional payments from the venture based on increases in total square footage of the project above 520,000 square feet and achieving certain project returns at stabilization.

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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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