| Discontinued Operations (Summary Of Income From Discontinued Operations And Related Realized And Unrealized Gains (Losses)) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
| Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | |
| Discontinued Operations [Abstract] | ||||
| Total revenues | $ 6,405 | $ 17,376 | $ 33,610 | $ 51,790 | 
| Operating and other expenses | (2,472) | (6,606) | (13,454) | (20,308) | 
| Depreciation and amortization | (1,769) | (4,351) | (8,196) | (13,363) | 
| Interest expense (net of interest income) | (82) | (118) | (673) | |
| Income from discontinued operations | 2,164 | 6,337 | 11,842 | 17,446 | 
| Loss from early extinguishment of debt | (703) | |||
| Impairments | (23,851) | |||
| Unrealized losses on disposition of rental property | (2,134) | |||
| Realized gains (losses) on disposition of rental property, net | 47,321 | 12 | 84,930 | 4,524 | 
| Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net | 47,321 | 12 | 61,079 | 2,390 | 
| Total discontinued operations, net | $ 49,485 | $ 6,349 | $ 72,218 | $ 19,836 | 
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- Definition Depreciation Amortization On Discontinued Operations No definition available. 
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- Definition Discontinued Operation, Gains Losses On Extinguishment Of Debt No definition available. 
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- Definition Discontinued Operations, Asset Impairment Charges No definition available. 
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- Definition Disposal Group, Including Discontinued Operation, Gain Loss On Disposition Of Assets No definition available. 
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- Definition Unrealized Gain Loss On Disposition Of Rental Property No definition available. 
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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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- Details 
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- Definition Amount of interest expense allocated to disposal group, including a discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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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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- 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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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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