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Investment in Real Estate (Details 3) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Long-lived Assets Held for Sale | $ 20,470 | $ 42,945
Long-lived Assets Held and Used | 16,290 | 95,120
Long-lived Assets Held for Sale | (1,360) | (2,755)
Long-lived Assets Held and Used | (190) | 1,894
Long-lived Assets impairment | (1,550) | (861)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Long-lived Assets Held for Sale |  |
Long-lived Assets Held and Used |  |
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Long-lived Assets Held for Sale |  |
Long-lived Assets Held and Used |  |
Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Long-lived Assets Held for Sale | 20,470 | 42,945
Long-lived Assets Held and Used | $ 16,290 | $ 95,120

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- Definition Long-lived Assets Held and Used. + References No definition available. + Details
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- Definition Long-lived Assets Held for Sale. + References No definition available. + Details
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- Definition Long-lived Assets impairment. + References No definition available. + Details
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- Definition Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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