Share-Based Compensation (Schedule of Share-Based Compensation Information) (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Share Based Compensation [Abstract] | |||
| Expense relating to share/unit grants | $ 3,229,000 | $ 3,954,000 | $ 4,496,000 |
| Amounts capitalized | (186,000) | (231,000) | (379,000) |
| Total charged to operations | $ 3,043,000 | $ 3,723,000 | $ 4,117,000 |
| Unvested shares/units, December 31, 2020 | 642,000 | ||
| Restricted share grants | 149,000 | ||
| Vested during period | (247,000) | ||
| Forfeitures/cancellations | (52,000) | ||
| Unvested shares/units, December 31, 2021 | 492,000 | 642,000 | |
| Unvested shares/unit, December 31, 2020, weighted average grant date fair value | $ 25.86 | ||
| Restricted share grants, weighted average grant date fair value | 11.98 | ||
| Vested during period, weighted average grant date fair value | 24.10 | ||
| Forfeitures/cancellations, weighted average grant date fair value | 17.07 | ||
| Unvested shares/unit, December 31, 2021, weighted average grant date fair value | $ 23.47 | $ 25.86 | |