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Investment in Unconsolidated Ventures (Financial Position of Unconsolidated Real Estate Ventures) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Financial position of the Real Estate Ventures |  |
Company's share of equity (Company's basis) | $ 127,536 | $ 115,807
Unconsolidated real estate ventures [Member] |  |
Financial position of the Real Estate Ventures |  |
Net property | 845,705 | 846,643
Other Assets | 131,347 | 110,520
Other Liabilities | 51,005 | 48,798
Debt | 682,558 | 745,830
Equity | 243,489 | 162,535
Company's share of equity (Company's basis) | $ 127,536 | $ 115,807

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