Quarterly report pursuant to Section 13 or 15(d)

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

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Commitments And Contingencies (Ground Lease Agreements) (Narrative) (Details)
 3 Months Ended
Mar. 31, 2021
USD ($)
item
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Lessee, Lease, Description [Line Items]      
Ground lease expense incurred $ 568,000 $ 683,000  
Operating lease $ 137,471,000   $ 23,602,000
Number of ground leases | item 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 $ 22,300,000