| 
           Discontinued Operations (Summary Of Income From Discontinued Operations And Related Realized And Unrealized Gains) (Details) (USD $) 
        In Thousands  | 
        3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
| 
           Jun. 30, 2011 
         | 
        
           Jun. 30, 2010 
         | 
        
           Jun. 30, 2011 
         | 
        
           Jun. 30, 2010 
         | 
      |
| Discontinued Operations | ||||
| Total revenues | $ 945 | $ 2,255 | ||
| Operating and other expenses | (498) | (1,173) | ||
| Depreciation and amortization on discontinued operations | (302) | (409) | ||
| Interest expense (net of interest income) | (134) | (431) | ||
| Income from discontinued operations before gains (losses) and unrealized losses on disposition of rental property | 11 | 242 | ||
| Realized gains (losses) and unrealized losses on disposition of rental property, net | 4,447 | 4,447 | ||
| Total discontinued operations, net | $ 4,458 | $ 4,689 | ||
| X | ||||||||||
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- Definition 
          Depreciation Amortization On Discontinued Operations 
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- Definition 
          Discontinued Operations 
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- Definition 
          Realized Gains (Losses) and Unrealized Losses on Disposition of Rental Property, Net 
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- Definition 
          Total Discontinued Operations Net. 
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- Definition 
          After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          Amount, if any, of interest expense allocated to the disposal group, including a component of the entity (discontinued operation), during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          Amount of operating expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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