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Investment in Unconsolidated Ventures (Summary of Results of Operations of Unconsolidated Real Estate Ventures) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Summary of results of operations of Real Estate Ventures |  |  |  |  |
Company's share of income (Company's basis) | $ 3,775,000 |  | $ 5,305,000 |  | $ 4,069,000
Unconsolidated real estate ventures [Member] |  |  |  |  |
Summary of results of operations of Real Estate Ventures |  |  |  |  |
Revenue | 145,867,000 | [1] | 118,923,000 | [1] | 105,236,000
Operating expenses | 63,715,000 | [1] | 44,942,000 | [1] | 38,691,000
Interest expense, net | 42,032,000 | [1] | 37,505,000 | [1] | 30,858,000
Depreciation and amortization | 39,172,000 | [1] | 32,703,000 | [1] | 36,700,000
Net income | 948,000 | [1] | 3,773,000 | [1] | (1,012,000)
Company's share of income (Company's basis) | 3,775,000 | [1] | 5,305,000 | [1] | 4,069,000
Guaranteed repayment of loans on behalf of a certain Real Estate Venture | $ 700,000 |  |  |  |
[1] | Includes the three real estate ventures that were deconsolidated upon the adoption of the accounting standard for the consolidation of VIEs on January 1, 2010.

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