Restricted Cash (Schedule Of Restricted Cash) (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Restricted Cash [Abstract] | ||
| Security deposits | $ 9,446 | $ 8,778 |
| Escrow and other reserve funds | 30,346 | 45,174 |
| Total restricted cash | $ 39,792 | $ 53,952 |