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Investment in Unconsolidated Ventures (Summary of Results of Operations of Unconsolidated Real Estate Ventures) (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Summary of results of operations of Real Estate Ventures |  |  |  |
Company's share of income (Company's basis) | $ 838,000 | $ 1,088,000 | $ 882,000 | $ 2,321,000
Unconsolidated real estate ventures [Member] |  |  |  |
Summary of results of operations of Real Estate Ventures |  |  |  |
Revenue | 39,008,000 | 32,722,000 | 77,601,000 | 72,398,000
Operating expenses | 11,000,000 | 14,370,000 | 27,815,000 | 30,544,000
Interest expense, net | 9,840,000 | 9,550,000 | 21,089,000 | 21,673,000
Depreciation and amortization | 13,887,000 | 8,487,000 | 25,358,000 | 18,968,000
Net income | 4,281,000 | 315,000 | 3,339,000 | 1,213,000
Guaranteed repayment of loans on behalf of a certain Real Estate Venture | $ 700,000 |  | $ 700,000 |

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