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 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
item
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]          
Ground lease expense incurred $ 680,000 $ 640,000 $ 1,300,000 $ 1,300,000  
Operating lease $ 23,770,000   $ 23,770,000   $ 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