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Investment in Unconsolidated Ventures Investment in Unconsolidated Ventures (Financial Position of Unconsolidated Real Estate Ventures) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Company's share of equity (Company's Basis) | $ 184,802 | $ 193,555
Unconsolidated Real Estate Ventures [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Net property | 823,199 | 923,536
Other assets | 168,077 | 174,677
Other liabilities | 31,209 | 53,645
Debt | 726,507 | 724,780
Equity | 233,560 | 319,788
Company's share of equity (Company's Basis) | $ 184,802 | $ 193,555

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