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Investment in Unconsolidated Ventures (Narrative) (Details) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2014 sqft Room Buildings Real_Estate_Ventures acre | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 13, 2013 Real_Estate_Ventures
Schedule of Equity Method Investments [Line Items] |  |  |  |
Company's share of equity (Company's Basis) | $ 180,237,000 |  | $ 180,512,000 |
Loss on real estate venture transactions | (135,000) | 0 |  |
Number of unconsolidated investments in Real Estate Ventures | 17 |  |  | 19
Number of real estate ventures that owns buildings | 11 |  |  |
Number of office buildings in Real Estate Ventures | 55 |  |  |
Aggregate Approximate Area Of Office Buildings | 5,700,000 |  |  |
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 | 808,000 | 7,039,000 |  |
Number of real estate ventures that owns land under development | 3 |  |  |
Area Owned By Real Estate Venture in Parcels Of Land Under Development | 22.5 |  |  |
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% |  |  |
TB-BDN Plymouth Apartments [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Guarantor Obligations, Current Carrying Value | 3,200,000 |  |  |
Unconsolidated Real Estate Ventures [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net rentable square feet | 5,700,000 |  |  | 6,400,000
The Grove at Cira Centre South [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Guarantor Obligations, Current Carrying Value | 24,700,000 |  |  |
PJP VII [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Guarantor Obligations, Current Carrying Value | $ 500,000 |  |  |

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