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Investment in Unconsolidated Real Estate Ventures (Textual) (Details) ft² in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2017 USD ($) property | Mar. 31, 2017 USD ($) property | Mar. 31, 2016 USD ($) | Mar. 31, 2017 | Mar. 31, 2017 property | Mar. 31, 2017 ft² | Mar. 31, 2017 Real_Estate_Investment | Mar. 31, 2017 a | Mar. 31, 2017 Apartment_unit | Dec. 31, 2016 USD ($)
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Management fees |  | $ 6,485,000 | $ 5,235,000 |  |  |  |  |  |  |
Accounts receivable |  | 12,099,000 |  |  |  |  |  |  |  | $ 12,446,000
Cash proceeds after the payment of share of the debt and closing costs |  | 27,230,000 | 4,812,000 |  |  |  |  |  |  |
Net gain on Real Estate Venture transactions |  | 14,582,000 | 5,929,000 |  |  |  |  |  |  |
1919 Venture [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Guarantees, maximum exposure amount |  | $ 88,900,000 |  |  |  |  |  |  |  |
TB-BDN Plymouth Apartments [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of ownership interest percentage | 50.00% |  |  |  |  |  |  |  |  |
Gross sales price | $ 100,500,000 |  |  |  |  |  |  |  |  |
Allocated gross sales value of ownership interest, percentage | 50.00% |  |  |  |  |  |  |  |  |
Guarantee obligations cancelled | $ 3,200,000 |  |  |  |  |  |  |  |  |
Cash proceeds after the payment of share of the debt and closing costs | 27,200,000 |  |  |  |  |  |  |  |  |
Net gain on Real Estate Venture transactions | 14,600,000 |  |  |  |  |  |  |  |  |
TB-BDN Plymouth Apartments [Member] | Pennsylvania [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Construction Loan | $ 54,000,000 |  |  |  |  |  |  |  |  |
Office Properties [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Properties Sold | property |  | 8 |  |  |  |  |  |  |  |
Multi-Family Complex [Member] | TB-BDN Plymouth Apartments [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Properties Sold | property | 398 |  |  |  |  |  |  |  |  |
Real Estate Venture [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Management fees |  | $ 1,500,000 | $ 1,500,000 |  |  |  |  |  |  |
Accounts receivable |  | 1,600,000 |  |  |  |  |  |  |  | $ 1,400,000
Unconsolidated Real Estate Ventures [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  |  |  |  | 13 |  |  |
Equity Method Investments including net liabilities |  | 264,900,000 |  |  |  |  |  |  |  |
Real estate ventures aggregate indebtedness to third parties |  | 953,800,000 |  |  |  |  |  |  |  |
Unconsolidated Real Estate Ventures [Member] | TB-BDN Plymouth Apartments [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity in income (loss) of Real Estate Ventures | $ 12,600,000 |  |  |  |  |  |  |  |  |
Unconsolidated Real Estate Ventures [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment percentage |  |  |  | 20.00% |  |  |  |  |  |
Unconsolidated Real Estate Ventures [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment percentage |  |  |  | 70.00% |  |  |  |  |  |
Unconsolidated Real Estate Ventures [Member] | Seven Real Estate Ventures [Member] | Office Properties [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  |  |  |  | 7 |  |  |
Rentable Square Feet | ft² |  |  |  |  |  | 8.0 |  |  |  |
Unconsolidated Real Estate Ventures [Member] | Two Real Estate Ventures [Member] | Undeveloped Land [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  |  |  |  | 2 |  |  |
Acreage of land | a |  |  |  |  |  |  |  | 4.3 |  |
Unconsolidated Real Estate Ventures [Member] | Two Other Real Estate Ventures [Member] | Under Active Development Land [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  |  |  |  | 2 |  |  |
Acreage of land | a |  |  |  |  |  |  |  | 1.4 |  |
Unconsolidated Real Estate Ventures [Member] | Two Other Real Estate Ventures [Member] | Residential Tower One [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  |  |  |  | 1 |  |  |
Number of Property units |  |  |  |  | 345 |  |  |  | 345 |
Unconsolidated Real Estate Ventures [Member] | Two Other Real Estate Ventures [Member] | Residential Tower Two [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  |  |  |  | 1 |  |  |
Number of Property units |  |  |  |  | 321 |  |  |  | 321 |
evo at Cira Centre South Venture [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Guarantees, maximum exposure amount |  | 55,400,000 |  |  |  |  |  |  |  |
PJP VII [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Guarantees, maximum exposure amount |  | $ 400,000 |  |  |  |  |  |  |  |

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