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Investment in Unconsolidated Ventures (Summary of Results of Operations of Unconsolidated Real Estate Ventures) (Details) (USD $) | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011
Summary of results of operations of Real Estate Ventures |  |
Company's share of income (Company's basis) | $ 44,000 | $ 1,233,000
Unconsolidated real estate ventures [Member] |  |
Summary of results of operations of Real Estate Ventures |  |
Revenue | 38,593,000 | 36,434,000
Operating expenses | 16,815,000 | 15,705,000
Interest expense, net | 11,249,000 | 11,207,000
Depreciation and amortization | 11,471,000 | 10,126,000
Net income | (942,000) | (604,000)
Guaranteed repayment of loans on behalf of a certain Real Estate Venture | $ 700,000 |

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