Commitments And Contingencies (Ground Lease Agreements) (Narrative) (Details) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
|
Sep. 30, 2020
USD ($)
|
Sep. 30, 2019
USD ($)
|
Sep. 30, 2020
USD ($)
item
|
Sep. 30, 2019
USD ($)
|
Dec. 31, 2019
USD ($)
|
|
| Lessee, Lease, Description [Line Items] | |||||
| Ground lease expense incurred | $ 473,000 | $ 640,000 | $ 1,800,000 | $ 1,200,000 | |
| Operating lease | $ 23,787,000 | $ 23,787,000 | $ 23,756,000 | ||
| Number of ground leases | item | 5 | ||||
| Minimum [Member] | |||||
| Lessee, Lease, Description [Line Items] | |||||
| Term of lease contract | 6 years 3 months | 6 years 3 months | |||
| Borrowing rate | 5.637% | 5.637% | |||
| Maximum [Member] | |||||
| Lessee, Lease, Description [Line Items] | |||||
| Term of lease contract | 82 years 6 months 29 days | 82 years 6 months 29 days | |||
| Borrowing rate | 7.618% | 7.618% | |||
| Accounting Standards Update 2016-02 [Member] | |||||
| Lessee, Lease, Description [Line Items] | |||||
| Operating lease | $ 22,600,000 | $ 22,600,000 | |||