Commitments And Contingencies (Ground Lease Agreements) (Narrative) (Details) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2020
USD ($)
property
|
Dec. 31, 2019
USD ($)
|
Dec. 31, 2018
USD ($)
|
|
| Lessee, Lease, Description [Line Items] | |||
| Ground lease expense incurred | $ 1,600 | $ 2,600 | $ 2,300 |
| Operating lease | $ 23,602 | $ 23,756 | |
| Number of ground leases | property | 3 | ||
| Minimum [Member] | |||
| Lessee, Lease, Description [Line Items] | |||
| Term of lease contract | 80 years 9 months 29 days | ||
| Borrowing rate | 7.576% | ||
| Maximum [Member] | |||
| Lessee, Lease, Description [Line Items] | |||
| Term of lease contract | 82 years 6 months 29 days | ||
| Borrowing rate | 7.618% | ||
| Accounting Standards Update 2016-02 [Member] | |||
| Lessee, Lease, Description [Line Items] | |||
| Operating lease | $ 22,300 | ||