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Fair Value Measurements (Schedule Of Assets Measured At A Fair Value On Non-recurring Basis) (Details) (USD $) | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate held for sale/conveyance | $ 191,538,000 | $ 206,674,000 | [1]
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate held for sale/conveyance |  |  | [1]
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate held for sale/conveyance | 113,162,000 | 124,154,000 | [1]
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate held for sale/conveyance | 78,376,000 | 82,520,000 | [1]
Subsequent Event [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate held for sale/conveyance | $ 900,000 |  |
[1] | Excludes $0.9 million relating to a property subsequently treated as "held for sale/conveyance".

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