| Summary Of Income From Discontinued Operations And Related Realized And Unrealized Gains (Losses) (Details) | 
|   |   |   |   |   |   |   |   |   |   |   |   |  
|   |   |   |   |   |   |   |   |   |   |   |   |  
|   |   | Three Months Ended June 30, |   |   | Six Months Ended June 30, |  
|   |   | 2021 |   |   | 2020 |   |   | 2021 |   |   | 2020 |  
| Total revenues | $ |  5,845  |   | $ |  37,512  |   | $ |  27,482  |   | $ |  77,574  |  
| Operating and other expenses |   |  (2,519) |   |   |  (14,157) |   |   |  (11,242) |   |   |  (30,653) |  
| Depreciation and amortization |   |  (253) |   |   |  (1,354) |   |   |  (912) |   |   |  (2,708) |  
| Interest expense |   |  (277) |   |   |  (1,307) |   |   |  (1,570) |   |   |  (2,613) |  
|   |   |   |   |   |   |   |   |   |   |   |   |  
| Income from discontinued operations |   |  2,796  |   |   |  20,694  |   |   |  13,758  |   |   |  41,600  |  
|   |   |   |   |   |   |   |   |   |   |   |   |  
| Unrealized gains (losses) on disposition of rental property (a) |   |  (951) |   |   |  (11,929) |   |   |  69 |   |   |  (56,997) |  
| Realized gains (losses) on disposition of rental property (b) |   |  3,031  |   |   |  - |   |   |  24,792 |   |   |  17,322 |  
| Realized gains (losses) and unrealized gains (losses) on |   |   |   |   |   |   |   |   |   |   |   |  
|    disposition of rental property and impairments, net |   |  2,080  |   |   |  (11,929) |   |   |  24,861  |   |   |  (39,675) |  
|   |   |   |   |   |   |   |   |   |   |   |   |  
| Total discontinued operations, net | $ |  4,876  |   | $ |  8,765  |   | $ |  38,619  |   | $ |  1,925  |   (a)Represents valuation allowances, including reversals, and impairment charges on properties classified as discontinued operations in 2020. (b)See Note 3: Real Estate Transactions – Dispositions for further information regarding properties sold and related gains (losses).  | 
| Summary Of Income From Discontinued Operations And Related Realized And Unrealized Gains (Losses) (Details) | 
|   |   |   |   |   |   |   |   |   |   |   |   |  
|   |   |   |   |   |   |   |   |   |   |   |   |  
|   |   | Three Months Ended June 30, |   |   | Six Months Ended June 30, |  
|   |   | 2021 |   |   | 2020 |   |   | 2021 |   |   | 2020 |  
| Total revenues | $ |  5,845  |   | $ |  37,512  |   | $ |  27,482  |   | $ |  77,574  |  
| Operating and other expenses |   |  (2,519) |   |   |  (14,157) |   |   |  (11,242) |   |   |  (30,653) |  
| Depreciation and amortization |   |  (253) |   |   |  (1,354) |   |   |  (912) |   |   |  (2,708) |  
| Interest expense |   |  (277) |   |   |  (1,307) |   |   |  (1,570) |   |   |  (2,613) |  
|   |   |   |   |   |   |   |   |   |   |   |   |  
| Income from discontinued operations |   |  2,796  |   |   |  20,694  |   |   |  13,758  |   |   |  41,600  |  
|   |   |   |   |   |   |   |   |   |   |   |   |  
| Unrealized gains (losses) on disposition of rental property (a) |   |  (951) |   |   |  (11,929) |   |   |  69 |   |   |  (56,997) |  
| Realized gains (losses) on disposition of rental property (b) |   |  3,031  |   |   |  - |   |   |  24,792 |   |   |  17,322 |  
| Realized gains (losses) and unrealized gains (losses) on |   |   |   |   |   |   |   |   |   |   |   |  
|    disposition of rental property and impairments, net |   |  2,080  |   |   |  (11,929) |   |   |  24,861  |   |   |  (39,675) |  
|   |   |   |   |   |   |   |   |   |   |   |   |  
| Total discontinued operations, net | $ |  4,876  |   | $ |  8,765  |   | $ |  38,619  |   | $ |  1,925  |   (a)Represents valuation allowances, including reversals, and impairment charges on properties classified as discontinued operations in 2020. (b)See Note 3: Real Estate Transactions – Dispositions for further information regarding properties sold and related gains (losses).  |