Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Ground Lease Agreements) (Narrative) (Details)

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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