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Mortgage Loans Payable And Secured Revolving Credit Facilities (Derivative Financial Instruments) (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 20, 2010
--- | --- | --- | ---
Derivative [Line Items] |  |  |
Mortgage loans payable subject to interest rate swaps | $ 31,417,000 | $ 32,091,000 |
Liabilities related to the fair value of interest swaps of mortgage loans payable | 1,577,000 | 2,053,000 |
Cash paid to terminate interest rate swaps |  |  | $ 5,500,000
Minimum [Member] |  |  |
Derivative [Line Items] |  |  |
Fixed annual interest rate | 5.20% |  |
Maximum [Member] |  |  |
Derivative [Line Items] |  |  |
Fixed annual interest rate | 6.50% |  |

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