Restricted Cash (Schedule Of Restricted Cash) (Details) - USD ($) $ in Thousands |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|---|---|
| Restricted Cash [Abstract] | ||||
| Security deposits | $ 5,289 | $ 5,677 | ||
| Escrow and other reserve funds | 8,918 | 9,900 | ||
| Total restricted cash | $ 14,207 | $ 15,577 | $ 19,921 | $ 39,792 |