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Investment in Unconsolidated Ventures Investment in Unconsolidated Ventures (Summary of Results of Operations of Unconsolidated Ventures) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Schedule of Equity Method Investments [Line Items] |  |
Company's share of income (Company's basis) | $ 1,535 | $ 44
Unconsolidated Real Estate Ventures [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenue | 40,889 | 38,593
Operating expenses | 18,266 | 16,815
Interest expense, net | 9,772 | 11,249
Depreciation and amortization | 12,906 | 11,471
Net loss | (55) | (942)
Company's share of income (Company's basis) | $ 1,535 | $ 44

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