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Commitments and Contingencies (Textual) (Details) - USD ($) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Apr. 02, 2015 | Jun. 30, 2016 | Dec. 03, 2015
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Associated letter of credit |  | $ 10.0 |
Development And Redevelopment [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Contractual obligations |  | 140.1 |
Capital Expenditures For Tenant Improvements [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Contractual obligations |  | 57.8 |
Subaru of America [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
NTE Amount |  |  | $ 77.3
TB-BDN Plymouth Apartments [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Guarantor obligations, current carrying value |  | 3.2 |
Construction Loan |  | 56.0 |
1919 Venture [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Guarantor obligations, current carrying value |  | 88.9 |
PJP VII [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Guarantor obligations, current carrying value |  | 0.5 |
A618 Market Street |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Contingent consideration, liability | $ 2.0 | 1.7 |
Fair value of contingent consideration | $ 1.6 |  |
Put Option [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Purchase price |  | $ 35.0 |
Minimum [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Lease terms |  | 5 years |
Maximum [Member] |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Lease terms |  | 73 years |

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