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Summary of Significant Accounting Policies (Textual) (Details) | 12 Months Ended |  |  |
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Dec. 31, 2016 USD ($) Customer shares | Dec. 31, 2015 USD ($) Customer | Dec. 31, 2014 USD ($) Customer | Jan. 31, 2017 USD ($) | Jun. 10, 2016 USD ($) | Jun. 02, 2010 shares
Summary Of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |
Real estate ventures aggregate indebtedness to third parties | $ 997,466,000 | $ 794,571,000 |  |  |  |
Revenue increased by straight-line rent adjustment | 26,300,000 | 21,600,000 | $ 13,700,000 |  |  |
Increased revenue due to amortization of deferred rent | 2,100,000 | 2,000,000 | 2,400,000 |  |  |
Decrease in revenue due to amortization of lease incentives | 2,000,000 | 1,800,000 | 1,500,000 |  |  |
Share-based compensation expense | 5,600,000 | 7,300,000 | 6,100,000 |  |  |
Share-based compensation expense, capitalized | 1,000,000 | 1,900,000 | $ 1,700,000 |  |  |
Variable interest entity, assets | 417,100,000 | 422,900,000 |  |  |  |
Variable interest entity, liabilities | $ 254,600,000 | $ 258,200,000 |  |  |  |
Common shares available for future awards | shares | 4,295,559 |  |  |  |  |
Increase in Common shares available for future awards | shares |  |  |  |  |  | 6,000,000
Employee Stock Option And Share Appreciation Rights |  |  |  |  |  |
Summary Of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |
Common shares available for future awards | shares | 2,377,778 |  |  |  |  | 3,600,000
Customer Concentration Risk [Member] | Rental Revenue [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies (Textual) [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 (Textual) [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 55 years |  |  |  |  |
Tenant Improvements Useful Lives | 16 years |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |  |  |  |
Tenant Improvements Useful Lives | 1 year |  |  |  |  |
TB-BDN Plymouth Apartments [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |
Guarantees, maximum exposure amount | $ 3,200,000 |  |  |  |  |
Construction Loan | 56,000,000 |  |  |  |  |
TB-BDN Plymouth Apartments [Member] | Subsequent Event [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |
Sale of ownership interest percentage |  |  |  | 50.00% |  |
Guarantee obligations cancelled |  |  |  | $ 3,200,000 |  |
1919 Venture [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |
Guarantees, maximum exposure amount | 88,900,000 |  |  |  |  |
Unconsolidated Real Estate Ventures [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |
Real estate ventures aggregate indebtedness to third parties | 997,466,000 |  |  |  |  |
Capitalized interest | 1,900,000 | $ 2,000,000 | $ 2,000,000 |  |  |
evo at Cira Centre South Venture [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |
Guarantor obligations, current carrying value | 52,500,000 |  |  |  |  |
Construction Loan |  |  |  |  | $ 97,800,000 |
PJP VII [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |
Real estate ventures aggregate indebtedness to third parties | 4,956,000 | $ 5,621,000 |  |  |  |
Guarantees, maximum exposure amount | $ 400,000 |  |  |  |  |

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