Other Assets and Deferred Charges, Net (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Deferred Costs And Other Assets [Line Items] | |||
| Amortization expense of deferred charges | $ 4.7 | $ 6.2 | $ 5.3 |
| Unsecured Revolving Credit Facility [Member] | |||
| Deferred Costs And Other Assets [Line Items] | |||
| Accumulated amortization of deferred lease origination costs | 36.3 | ||
| Accumulated amortization of deferred financing costs | $ 2.9 | ||