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Summary of Significant Accounting Policies (Textual) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) Customer shares | Dec. 31, 2014 USD ($) Customer | Dec. 31, 2013 USD ($) Customer | Jun. 02, 2010 shares
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Revenue increased by straight-line rent adjustment | $ 21,600,000 | $ 13,700,000 | $ 17,700,000 |
Increased revenue due to amortization of deferred rent | 2,000,000 | 2,400,000 | 2,400,000 |
Decrease in revenue due to amortization of lease incentives | $ 1,800,000 | 1,500,000 | 700,000 |
Common shares available for future awards | shares | 4,295,559 |  |  |
Increase in Common shares available for future awards | shares |  |  |  | 6,000,000
Stock-based compensation expense | $ 7,300,000 | 6,100,000 | 8,300,000 |
Stock-based compensation expense, capitalized | 1,900,000 | 1,700,000 | 1,400,000 |
Variable interest entity, assets | 422,900,000 |  |  |
Variable interest entity, liabilities | $ 258,200,000 |  |  |
Employee Stock Option And Share Appreciation Rights |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Common shares available for future awards | shares | 2,624,067 |  |  | 3,600,000
Options [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Stock-based compensation expense | $ 0 | 0 | 700,000 |
Stock-based compensation expense, capitalized | $ 0 | $ 0 | $ 100,000 |
Customer Concentration Risk [Member] | Rental Revenue [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Number of tenant accounted for 10% or more of the Company’s rents | Customer | 0 | 0 | 0 |
Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Property, Plant and Equipment, Useful Life | 55 years |  |  |
Tenant Improvements Useful Lives | 16 years |  |  |
Maximum [Member] | Options [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Share based compensation, term | 10 years |  |  |
Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |  |
Tenant Improvements Useful Lives | 1 year |  |  |
Minimum [Member] | Options [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Share based compensation, term | 1 year |  |  |
The Grove at Cira Centre South [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Guarantor obligations, current carrying value | $ 24,700,000 |  |  |
TB-BDN Plymouth Apartments [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Guarantor obligations, current carrying value | 3,200,000 |  |  |
PJP VII [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Guarantor obligations, current carrying value | 500,000 |  |  |
Unconsolidated Real Estate Ventures [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Capitalized interest | 2,000,000 | $ 2,000,000 | $ 600,000 |
1919 Venture [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Guarantor obligations, current carrying value | $ 88,900,000 |  |  |
New Accounting Pronouncement, Early Adoption Effect [Member] |  |  |  |
Summary Of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Deferred financing costs reclassified from the deferred costs line and netted against the debt liability |  | $ 24,000,000 |  |

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