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Investment in Unconsolidated Ventures (Summary of Results of Operations of Unconsolidated Real Estate Ventures) (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Summary of results of operations of Real Estate Ventures |  |  |  |
Company's share of income (Company's basis) | $ 500,000 | $ 418,000 | $ 1,382,000 | $ 2,739,000
Loss on real estate venture formation | (950,000) | 0 | (950,000) | 0
Unconsolidated real estate ventures [Member] |  |  |  |
Summary of results of operations of Real Estate Ventures |  |  |  |
Revenue | 42,772,000 | 36,345,000 | 120,644,000 | 108,743,000
Operating expenses | 18,753,000 | 15,863,000 | 51,819,000 | 46,407,000
Interest expense, net | 10,233,000 | 10,326,000 | 31,100,000 | 31,999,000
Depreciation and amortization | 12,947,000 | 9,869,000 | 36,067,000 | 28,836,000
Net income | 839,000 | 287,000 | 1,658,000 | 1,501,000
Guaranteed repayment of loans on behalf of a certain Real Estate Venture | $ 600,000 |  | $ 600,000 |

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