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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 23, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Purchase price of acquired property |  | $ 42,991,000 | $ 38,861,000 | $ 32,818,000
Depreciation expense |  | 35,000,000 | 35,000,000 | 41,100,000
Cash at consolidated joint ventures |  | 200,000 | 800,000 |
Allowance for doubtful accounts receivable |  | 4,400,000 | 4,300,000 |
Provision for doubtful accounts included in operating, maintenance and management expenses |  | $ 1,400,000 | $ 1,900,000 | $ 1,800,000
2012 Stock Incentive Plan [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Maximum number of shares may be issued under the plan |  | 4,500,000 |  |
Maximum number of shares to be granted per year to a participant |  | 500,000 |  |
Variable Interest Entity, Primary Beneficiary [Member] | Other Ownership Interest [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Ownership percentage |  | 60.00% |  |
VIE real estate owned carrying value |  | $ 39,900,000 |  |
VIE mortgage payable |  | $ 0 |  |
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] |  |  |  |
Percentage of joint venture ownership | 100.00% |  |  |
Acquired ownership percentage in joint venture | 60.00% |  |  |
Amount of purchase price paid in cash | $ 10,900,000 |  |  |
Amount of purchase price representing 60% share of in-place mortgage financing | $ 16,400,000 |  |  |
Percentage of share of in-place mortgage financing | 60.00% |  |  |
Investments in and advances to unconsolidated joint ventures | $ 27,300,000 |  |  |
New London Mall [Member] | New London Joint Venture [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Acquired ownership percentage in joint venture | 60.00% |  |  |
San Souci Plaza [Member] | General Partner [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Ownership percentage |  | 40.00% |  |

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