Shareholders' Equity (Schedule of Dividends) (Details) - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Class Of Stock [Line Items] | |||
| Common stock | $ 0.264 | $ 0.528 | $ 1.320 |
| Series B Preferred Stock [Member] | |||
| Class Of Stock [Line Items] | |||
| Cumulative Redeemable Preferred Stock | $ 1.812 | $ 1.812 | $ 1.812 |
| Dividend rate percentage | 7.25% | 7.25% | 7.25% |
| Series C Preferred Stock [Member] | |||
| Class Of Stock [Line Items] | |||
| Cumulative Redeemable Preferred Stock | $ 1.625 | $ 1.625 | $ 1.625 |
| Dividend rate percentage | 6.50% | 6.50% | 6.50% |