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Properties Held For Sale and Related Transactions (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  |
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Apr. 30, 2011 | Dec. 31, 2012 property | Dec. 31, 2012 property | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Other Properties [Member] | Dec. 31, 2012 Homburg Joint Venture Properties [Member] | Dec. 31, 2011 Homburg Joint Venture Properties [Member] | Dec. 31, 2011 Discount Drug Mart Portfolio [Member] | Dec. 31, 2010 Discount Drug Mart Portfolio [Member] | Dec. 31, 2011 Malls [Member] | Dec. 31, 2010 Malls [Member] | Dec. 31, 2011 Single Tenant/Triple-Net-Lease Properties [Member] | Dec. 31, 2010 Single Tenant/Triple-Net-Lease Properties [Member] | Dec. 31, 2011 Development Projects And Other Non-Core Properties [Member] | Dec. 31, 2010 Development Projects And Other Non-Core Properties [Member] | Jan. 31, 2013 East Chestnut [Member] | Dec. 31, 2012 Philadelphia Redevelopment Property [Member] | Dec. 31, 2011 Ohio Properties [Member] | Dec. 31, 2012 Properties Held For Sale/Conveyance [Member] property | Dec. 31, 2011 Properties Held For Sale/Conveyance [Member] Ohio Properties [Member] property | Dec. 31, 2012 Meadows Marketplace And Fieldstone Marketplace [Member] | Apr. 30, 2011 Unconsolidated Properties [Member] | Dec. 31, 2011 Wholly Owned Properties [Member] | Apr. 30, 2011 Wholly Owned Properties [Member] | Dec. 31, 2012 HII Joint Venture [Member] property | Oct. 31, 2011 HII Joint Venture [Member] property | Oct. 31, 2011 HII Joint Venture [Member] Meadows Marketplace And Fieldstone Marketplace [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan to developers | $ 4,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on loan to developers | 6.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge of mortgage loan receivable |  | 4,400,000 |  |  | 4,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of property sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,100,000 |  |  |  |  |  |  |  |  | 23,600,000 |  |
Impairment (charges)/reversals |  |  | 4,000 | [1] | 88,458,000 | [1] | 39,822,000 | [1] | 2,400,000 | (2,400,000) | 2,400,000 | 11,100,000 | 26,800,000 | 33,100,000 | 12,600,000 | 5,300,000 | 100,000 | 36,600,000 | 300,000 |  |  | 10,500,000 |  |  |  |  | 9,100,000 |  |  |  |
Number of properties |  | 67 | 67 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 12 |  |  |  |  |  | 9 |
Property ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  | 20.00% | 80.00%
Number of properties in process of conveying |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Number of properties sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |
Purchase price of acquired property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,300,000 |  |  |  |  |  |
Assumption of mortgage financing related to the exchange agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,800,000 |  |  |  |  |  |
Increase in shareholders' equity |  |  | (6,148,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage financing transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,500,000 |  |
Estimated gain that would be recognized at the time of conveyances |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,100,000 |  |  |  |  |  |  |  |  |  |
Aggregate loan balance and accrued interest |  |  | 23,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guaranteed loan amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |  |  |
Non-recourse mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,700,000 |  | 12,900,000 |  |  |
Loss on exit from unconsolidated joint venture |  |  | $ 30,526,000 |  | $ (7,961,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Included in discontinued operations in the accompanying statements of operations.

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