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Leases Leases Other Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Lessor, Lease, Description [Line Items]        
Ground Leases, Percent Of Land Acquired 50.00%      
Payments to Acquire Land     $ 14,000  
Lessee, Operating Lease, Lease Not Yet Commenced, Value   $ 2,900    
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract   7 years    
Percent of Operating Leases Where Company is the Lessor   95.00%    
Percent of Investment Property, Net on the Consolidated Balance Sheets   95.00%    
Operating Lease, Payments   $ 2,199 3,340 $ 3,182
Finance Lease, Principal Payments   120 120 121
Operating and Financing, Payments   $ 2,319 3,460 $ 3,303
Ground Lease [Member]        
Lessor, Lease, Description [Line Items]        
Payments to Acquire Land $ 8,000      
Impairment of Intangible Assets, Finite-lived     1,100  
Impairment of Intangible Assets, Accumulated Amortization     300  
Property, Operating and Maintenance [Member] | Ground Lease [Member]        
Lessor, Lease, Description [Line Items]        
Impairment of Intangible Assets (Excluding Goodwill)     $ 800