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)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
item
Mar. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]    
Ground lease expense incurred $ 683,000,000 $ 630,000,000
Operating lease $ 23,768 $ 23,756
Number of ground leases | item 5  
Minimum [Member]    
Lessee, Lease, Description [Line Items]    
Term of lease contract 6 years 3 months  
Borrowing rate 5.637%  
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 $ 23,800