Restricted Cash (Schedule Of Restricted Cash) (Details) - USD ($) $ in Thousands |
Mar. 31, 2018 |
Dec. 31, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|---|---|
| Restricted Cash [Abstract] | ||||
| Security deposits | $ 8,971 | $ 9,446 | ||
| Escrow and other reserve funds | 25,859 | 30,346 | ||
| Total restricted cash | $ 34,830 | $ 39,792 | $ 57,596 | $ 53,952 |