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Investment in Unconsolidated Ventures Investment in Unconsolidated Ventures (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  | 6 Months Ended |  |  | 6 Months Ended |
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Jun. 30, 2013 Buildings Real_Estate_Ventures sqft Room acre | Jun. 30, 2012 | Jun. 30, 2013 Buildings Real_Estate_Ventures sqft Room acre | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 19, 2013 Two Tower Bridge [Member] | Jun. 30, 2013 Six Tower Bridge [Member] | Jun. 19, 2013 Six Tower Bridge [Member] | Mar. 26, 2013 BDN Beacon Venture LLC [Member] | Jun. 30, 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from remeasurement of investment in a real estate venture | $ 7,847,000 | $ 0 | $ 7,847,000 | $ 0 |  |  | $ 7,800,000 |  |  |  |  |  |  |
Number of floors of a building |  |  |  |  |  |  |  |  |  |  | 33 |  |  |
Student housing bed capacity |  |  |  |  |  |  |  |  |  |  | 850 |  |  |
Company's share of equity (Company's Basis) | 176,875,000 |  | 176,875,000 |  | 193,555,000 | (100,000) |  |  | 17,000,000 |  |  |  |  |
Net gain (loss) on real estate venture transactions | 3,683,000 |  | 3,683,000 | 0 |  |  |  |  |  |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | 17 |  | 17 |  |  |  |  |  |  |  |  |  |  |
Number of real estate ventures that owns buildings | 12 |  | 12 |  |  |  |  |  |  |  |  |  |  |
Number of office buildings in Real Estate Ventures | 50 |  | 50 |  |  |  |  |  |  |  |  |  |  |
Aggregate Approximate Area Of Office Buildings | 6,200,000 |  | 6,200,000 |  |  |  |  |  |  |  |  |  |  |
Number of real estate ventures that owns undeveloped land | 3 |  | 3 |  |  |  |  |  |  |  |  |  |  |
Area Owned By Real Estate Venture Of Undeveloped Parcels Of Land | 24 |  | 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 |  |  | 12,568,000 | 18,617,000 |  |  |  |  |  | 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 |  | 1 |  |  |  |  |  |  |  |  |  |  |
Area Owned By Real Estate Venture in Parcels Of Land Under Development | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |
Number of real estate ventures developed hotel property | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |
Number Of Rooms Contain In One Real Estate Venture Developed As Hotel Property | 137 |  | 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 |  | 600,000 |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  |  |  |  |  |  |  |  | 23,000,000 |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  | 20.00% |  |  | 30.00% | 30.00% | 40.00%
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net |  |  |  |  |  |  |  | 24,500,000 |  |  |  |  |  |
Business Acquisition Purchase Price Allocation Building |  |  |  |  |  |  |  | 14,800,000 |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Land |  |  |  |  |  |  |  | 6,900,000 |  |  |  |  |  |
Business Acquisition Purchase Price Allocation Intangible Assets |  |  |  |  |  |  |  | 3,300,000 |  |  |  |  |  |
Business Acquisition Purchase Price Allocated To Market Lease Liabilities |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |
Investments, Fair Value Disclosure |  |  |  |  |  | $ 3,600,000 |  |  |  |  |  |  |  |

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- Definition The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 35 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents the carrying value of a short-term real estate loan to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project, usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property. Note that there are separate concepts for the current and noncurrent portions of long-term construction loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 52 -IssueDate 2006-05-01 -Chapter 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 + Details
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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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