Shareholders' Equity (Schedule Of Dividends) (Details) - $ / shares |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
Class Of Stock [Line Items] | ||||
Common stock | $ 0.050 | $ 0.050 | $ 0.100 | $ 0.100 |
Series B [Member] | ||||
Class Of Stock [Line Items] | ||||
Cumulative Redeemable Preferred Stock | 0.453 | $ 0.453 | 0.906 | $ 0.906 |
Series C Preferred Stock [Member] | ||||
Class Of Stock [Line Items] | ||||
Cumulative Redeemable Preferred Stock | $ 0.406 | $ 0.813 |