Shareholders' Equity (Schedule of Dividends) (Details) - $ / shares |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
|
Class Of Stock [Line Items] | ||||
Common stock | $ 0.050 | $ 0.050 | $ 0.150 | $ 0.150 |
Series B [Member] | ||||
Class Of Stock [Line Items] | ||||
Cumulative Redeemable Preferred Stock | $ 0.453 | $ 0.453 | $ 1.359 | $ 1.359 |
Dividend rate percentage | 7.25% | 7.25% | 7.25% | 7.25% |
Series C Preferred Stock [Member] | ||||
Class Of Stock [Line Items] | ||||
Cumulative Redeemable Preferred Stock | $ 0.406 | $ 0.406 | $ 1.219 | $ 1.219 |
Dividend rate percentage | 6.50% | 6.50% | 6.50% | 6.50% |