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Investment In Cedar/RioCan Joint Venture (Details) (USD $) | 12 Months Ended |  |  | 0 Months Ended |
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Dec. 31, 2012 property | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2012 Cedar/Rio Can Joint Venture [Member] | Dec. 31, 2011 Cedar/Rio Can Joint Venture [Member] | Dec. 31, 2010 Cedar/Rio Can Joint Venture [Member] | Oct. 09, 2012 Cedar/Rio Can Joint Venture [Member] property | Oct. 09, 2012 Rio Can [Member] | Oct. 10, 2012 Franklin Village Plaza [Member] | Apr. 15, 2011 Northwoods Crossing [Member] | Apr. 15, 2011 Northwoods Crossing [Member] Cedar/Rio Can Joint Venture [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee revenue |  |  |  |  |  |  |  | $ 2,800,000 | $ 2,800,000 | $ 3,600,000 |  |  |  |  |
Percentage of joint venture ownership |  |  |  |  |  |  |  |  |  |  | 20.00% | 80.00% |  |  |
Number of properties | 67 |  |  |  |  |  |  |  |  |  | 22 |  |  |  |
Mortgage assumed |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,400,000 |
Mortgage interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.20% |
Mortgage maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 01, 2016 |
Property ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Purchase price of acquired property |  |  |  |  |  |  |  |  |  |  |  |  | 75,100,000 |  | 23,500,000
Assumption of mortgage financing related to the exchange agreement |  |  |  |  |  |  |  |  |  |  |  |  | 43,100,000 |  |
Cash received in the exchange transaction |  |  |  |  |  |  |  |  |  |  |  |  | 41,600,000 |  |
Gain (loss) on exit from unconsolidated joint ventures | 30,526,000 |  | (7,961,000) |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge of reclassified properties |  |  |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |
Impairment charges | 5,779,000 | [1] | 7,148,000 | [1] | 2,493,000 | [1] | 23,600,000 |  |  |  |  |  |  |  |
Investment advisor fees |  |  |  |  |  |  |  |  |  | $ 2,700,000 |  |  |  |  |
[1] | Included in operating income in the accompanying statements of operations.

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