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 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
item
Sep. 30, 2018
USD ($)
Lessee, Lease, Description [Line Items]        
Ground lease expense incurred $ 640,000 $ 608,000 $ 1,200,000 $ 1,700,000
Operating lease $ 23,745,000   $ 23,745,000  
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 $ 22,400,000   $ 22,400,000