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Investment in Unconsolidated Ventures (Narrative) (Details) (USD $) | 9 Months Ended |  | 0 Months Ended |  |  |  |  |  | 0 Months Ended
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Sep. 30, 2014 Buildings acre Real_Estate_Ventures Room ApartmentUnits sqft | Sep. 30, 2013 Real_Estate_Ventures | Dec. 31, 2013 | Jul. 31, 2014 Crossings at Lakeline [Member] | Jul. 31, 2014 Crossings at Lakeline [Member] sqft Storey Properties | Sep. 30, 2014 TB-BDN Plymouth Apartments [Member] | Sep. 30, 2014 Unconsolidated Real Estate Ventures [Member] sqft | Sep. 30, 2013 Unconsolidated Real Estate Ventures [Member] sqft | Sep. 30, 2014 The Grove at Cira Centre South [Member] | Sep. 30, 2014 PJP VII [Member] | Apr. 03, 2014 Four Points Centre [Member] Storey Properties sqft | Jul. 31, 2014 DRA Advisors LLC [Member] Crossings at Lakeline [Member] | Jul. 31, 2014 Brandywine Realty Trust [Member] Crossings at Lakeline [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments, Cash contributions |  |  |  | $ 12,800,000 |  |  |  |  |  |  |  | $ 6,400,000 | $ 6,400,000
Equity method investments, Purchase adjustments |  |  |  | 900,000 |  |  |  |  |  |  |  |  |
Equity method investments, Closing costs |  |  |  |  | 100,000 |  |  |  |  |  |  |  |
Equity method investments, Credit from seller |  |  |  | 600,000 |  |  |  |  |  |  |  |  |
Number of floors of a building |  |  |  |  | 3 |  |  |  |  |  | 3 |  |
Company's share of equity (Company's Basis) | 197,539,000 |  | 180,512,000 |  |  |  |  |  |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | 17 | 17 |  |  |  |  |  |  |  |  |  |  |
Net rentable square feet |  |  |  |  |  |  | 6,100,000 | 6,200,000 |  |  |  |  |
Number of Real Estate Properties |  |  |  |  | 2 |  |  |  |  |  | 2 |  |
Net Rentable Area |  |  |  |  | 232,274 |  |  |  |  |  |  |  |
Equity method investment, Consideration transferred |  |  |  | 48,200,000 |  |  |  |  |  |  |  |  |
Net Rentable Space |  |  |  |  |  |  |  |  |  |  | 192,396 |  |
Number of real estate ventures that owns buildings | 11 |  |  |  |  |  |  |  |  |  |  |  |
Number of office buildings in Real Estate Ventures | 58 |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Approximate Area Of Office Buildings | 6,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate ventures that owns undeveloped land | 2 |  |  |  |  |  |  |  |  |  |  |  |
Area Owned By Real Estate Venture Of Undeveloped Parcels Of Land | 3.8 |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Equity Method Investments | 16,330,000 | 30,142,000 |  |  |  |  |  |  |  |  |  |  |
Number of real estate ventures that owns land under development | 3 |  |  |  |  |  |  |  |  |  |  |  |
Area Owned By Real Estate Venture in Parcels Of Land Under Development | 21.8 |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Investments in residential towers | 1 |  |  |  |  |  |  |  |  |  |  |  |
Number of apartment units in a Real Estate Venture | 345 |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate ventures developed hotel property | 1 |  |  |  |  |  |  |  |  |  |  |  |
Number Of Rooms Contain In One Real Estate Venture Developed As Hotel Property | 137 |  |  |  |  |  |  |  |  |  |  |  |
Minimum Percentage Of Unconsolidated Equity Method Investment Ownership | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Maximum Percentage Of Unconsolidated Equity Method Investment Ownership | 65.00% |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value |  |  |  |  |  | $ 3,200,000 |  |  | $ 24,700,000 | $ 500,000 |  |  |

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