Restricted Cash (Schedule Of Restricted Cash) (Details) - USD ($) $ in Thousands |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|---|---|
| Restricted Cash [Abstract] | ||||
| Security deposits | $ 10,257 | $ 9,446 | ||
| Escrow and other reserve funds | 9,664 | 30,346 | ||
| Total restricted cash | $ 19,921 | $ 39,792 | $ 53,952 | $ 35,343 |