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Summary Of Significant Accounting Policies (Narrative) (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 23, 2015 | Dec. 31, 2016 USD ($) Segment shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Depreciation expense |  | $ 37,100,000 | $ 35,000,000 | $ 35,000,000
Cash at consolidated joint ventures |  | 500,000 | 200,000 |
Allowance for doubtful accounts receivable |  | 4,700,000 | 4,400,000 |
Provision for doubtful accounts included in operating, maintenance and management expenses |  | $ 1,200,000 | $ 1,400,000 | $ 1,900,000
Number of reportable segment | Segment |  | 1 |  |
Remaining contractual payment for ground lease and executive office lease agreements |  | $ 17,100,000 |  |
Ground lease and executive office lease agreements remaining weighted average term |  | 46 years 1 month 6 days |  |
2012 Stock Incentive Plan [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Maximum number of shares may be issued under the plan | shares |  | 4,500,000 |  |
Maximum number of shares to be granted per year to a participant | shares |  | 500,000 |  |
Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Real estate investments useful life |  | 3 years |  |
Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Real estate investments useful life |  | 40 years |  |
New London Mall [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Acquired ownership percentage in joint venture | 60.00% |  |  |
Percentage of joint venture ownership | 100.00% |  |  |
New London Mall [Member] | New London Joint Venture [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Acquired ownership percentage in joint venture | 60.00% |  |  |
Variable Interest Entity, Primary Beneficiary [Member] | Other Ownership Interest [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
VIE real estate owned carrying value |  | $ 39,200,000 |  |
VIE mortgage payable |  | $ 0 |  |
Variable Interest Entity, Primary Beneficiary [Member] | Crossroads II [Member] | Other Ownership Interest [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Ownership percentage |  | 60.00% |  |
Variable Interest Entity, Primary Beneficiary [Member] | San Souci Plaza [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
VIE real estate owned carrying value |  | $ 26,200,000 |  |
VIE mortgage payable |  | $ 0 |  |

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