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Investment in Unconsolidated Ventures (Financial Position of Unconsolidated Real Estate Ventures) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Loss on real estate venture formation | $ 950 | $ 0 | $ 950 | $ 0 |
Financial position of the Real Estate Ventures |  |  |  |  |
Company's share of equity (Company's basis) | 179,037 |  | 179,037 |  | 115,807
Unconsolidated real estate ventures [Member] |  |  |  |  |
Financial position of the Real Estate Ventures |  |  |  |  |
Net property | 925,227 |  | 925,227 |  | 846,643
Other Assets | 180,957 |  | 180,957 |  | 110,520
Other Liabilities | 55,592 |  | 55,592 |  | 48,798
Debt | 740,885 |  | 740,885 |  | 745,830
Equity | 309,707 |  | 309,707 |  | 162,535
Company's share of equity (Company's basis) | $ 179,037 |  | $ 179,037 |  | $ 115,807

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