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Investment in Unconsolidated Ventures (Narrative) (Details) $ in Thousands |  |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 22, 2015 USD ($) ft² | May. 29, 2015 USD ($) a | Jan. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) a ft² apartment_unit real_estate_venture Room building | Dec. 31, 2014 USD ($) | Sep. 30, 2014 ft² real_estate_venture | Dec. 19, 2007 ft² property
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | real_estate_venture |  |  |  | 17 |  | 17 |
Equity method Investments including net liabilities |  |  |  | $ 210,700 |  |  |
Company's share of equity (Company's basis) |  |  |  | 211,771 | $ 225,004 |  |
Other liabilities |  |  |  | $ 41,630 | 37,558 |  |
Number of negative investment real estate ventures | real_estate_venture |  |  |  | 1 |  |  |
Number of real estate ventures that owns buildings | real_estate_venture |  |  |  | 9 |  |  |
Number of office buildings in Real Estate Ventures | building |  |  |  | 29 |  |  |
Aggregate approximate area of office buildings | ft² |  |  |  | 4,000,000 |  |  |
Number of real estate ventures that owns undeveloped land | real_estate_venture |  |  |  | 3 |  |  |
Area owned by real estate venture of undeveloped parcels of land | a |  |  |  | 4.4 |  |  |
Number of real estate ventures that owns land under development | real_estate_venture |  |  |  | 3 |  |  |
Area owned by real estate venture in parcels of land under development | a |  |  |  | 22.5 |  |  |
Number of real estate Investments in residential towers | real_estate_venture |  |  |  | 1 |  |  |
Number of apartment units in a real estate Venture | apartment_unit |  |  |  | 345 |  |  |
Number of real estate ventures developed hotel property | real_estate_venture |  |  |  | 1 |  |  |
Number of rooms contain in one real estate venture developed as hotel property | Room |  |  |  | 137 |  |  |
Minimum percentage of unconsolidated equity method investment ownership |  |  |  | 20.00% |  |  |
Maximum percentage of unconsolidated equity method investment ownership |  |  |  | 70.00% |  |  |
River Place [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Proceeds from collection of notes receivable |  |  | $ 88,000 |  |  |  |
Coppell Associates [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Other liabilities |  |  |  | $ 1,100 | $ 1,200 |  |
51 N 50 Patterson [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Area owned by real estate venture of undeveloped parcels of land | a |  | 0.9 |  |  |  |  |
Ownership percentage |  | 70.00% |  |  |  |  |
Payments to acquire land |  | $ 15,200 |  |  |  |  |
1250 First Street Office [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Area owned by real estate venture of undeveloped parcels of land | a |  | 0.5 |  |  |  |  |
Ownership percentage |  | 70.00% |  |  |  |  |
Payments to acquire land |  | $ 13,200 |  |  |  |  |
25 M Street [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Carrying value of assets |  |  |  | $ 20,500 |  |  |
GI Interchange Office LLC (DRA — N. PA) [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  |  | 29
Rentable Square Feet | ft² |  |  |  |  |  |  | 1,611,961
Unconsolidated Real Estate Ventures [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Net rentable square feet | ft² |  |  |  | 4,000,000 |  | 5,900,000 |
The Grove at Cira Centre South [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Guarantor obligations, current carrying value |  |  |  | $ 24,700 |  |  |
TB-BDN Plymouth Apartments [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Guarantor obligations, current carrying value |  |  |  | 3,200 |  |  |
1919 Venture [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Guarantor obligations, current carrying value |  |  |  | 88,900 |  |  |
PJP VII [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Guarantor obligations, current carrying value |  |  |  | $ 500 |  |  |
JBG [Member] | 51 N 50 Patterson [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage |  | 30.00% |  |  |  |  |
Payments to acquire land |  | $ 6,500 |  |  |  |  |
JBG [Member] | 1250 First Street Office [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage |  | 30.00% |  |  |  |  |
Payments to acquire land |  | $ 5,700 |  |  |  |  |
Brandywine Realty Trust [Member] | GI Interchange Office LLC (DRA — N. PA) [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 20.00%
Broadmoor Austin Associates [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage | 50.00% |  |  |  |  |  |
Payments to acquire land | $ 143,800 |  |  |  |  |  |
Rentable Square Feet | ft² | 1,112,236 |  |  |  |  |  |

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