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Investment in Unconsolidated Ventures Investment in Unconsolidated Ventures (Narrative) (Details) (USD $) | 3 Months Ended |  |  | 3 Months Ended |
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Mar. 31, 2013 sqft Room acre Buildings Real_Estate_Ventures | Mar. 31, 2012 | Dec. 31, 2012 | Mar. 26, 2013 BDN Beacon Venture LLC [Member] | Mar. 31, 2013 The Grove at Cira Centre South [Member] | Jan. 25, 2013 The Grove at Cira Centre South [Member] beds acre Storey | Jan. 25, 2013 The Grove at Cira Centre South [Member] Brandywine Realty Trust [Member] | Jan. 25, 2013 The Grove at Cira Centre South [Member] Campus Crest Properties, LLC [Member] | Jan. 25, 2013 The Grove at Cira Centre South [Member] HSRE, LLC [Member] [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of floors of a building |  |  |  |  |  | 33 |  |  |
Student housing bed capacity |  |  |  |  |  | 850 |  |  |
Company's share of equity (Company's Basis) | $ 184,802,000 |  | $ 193,555,000 | $ 17,000,000 |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | 19 |  |  |  |  |  |  |  |
Number of real estate ventures that owns buildings | 14 |  |  |  |  |  |  |  |
Number of office buildings in Real Estate Ventures | 52 |  |  |  |  |  |  |  |
Aggregate Approximate Area Of Office Buildings | 6,400,000 |  |  |  |  |  |  |  |
Number of real estate ventures that owns undeveloped land | 3 |  |  |  |  |  |  |  |
Area Owned By Real Estate Venture Of Undeveloped Parcels Of Land | 24 |  |  |  |  | 1 |  |  |
Equity Method Investment, Underlying Equity in Net Assets |  |  |  |  |  | 8,500,000 |  |  |
Equity Method Investment, Budgeted Total Project Cost |  |  |  |  | 158,500,000 |  |  |  |
Payments to Acquire Equity Method Investments | 7,039,000 | 12,512,000 |  |  | 60,700,000 |  |  |  |
Construction Loan |  |  |  |  | 97,800,000 |  |  |  |
Equity Method Investment, Aggregate Cost |  |  |  |  |  | 6,000,000 |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  |  |  |  |  | 2,500,000 |  |  |
Number of real estate ventures that owns land under development | 1 |  |  |  |  |  |  |  |
Area Owned By Real Estate Venture in Parcels Of Land Under Development | 1 |  |  |  |  |  |  |  |
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 | 600,000 |  |  |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  |  |  | $ 23,000,000 |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 20.00% |  |  | 30.00% | 30.00% | 40.00%

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