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Investment in Unconsolidated Ventures (Financial Position of Unconsolidated Real Estate Ventures) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Financial position of the Real Estate Ventures |  |
Debt | $ (745,830) |
Company's share of equity (Company's basis) | 115,807 | 84,372
Unconsolidated real estate ventures [Member] |  |
Financial position of the Real Estate Ventures |  |
Net property | (846,643) | (804,705)
Other Assets | (110,520) | (105,576)
Other Liabilities | (48,798) | (44,509)
Debt | (745,830) | (748,387)
Equity | 162,535 | 117,385
Company's share of equity (Company's basis) | $ 115,807 | $ 84,372

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