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Leases - As Lessor (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Lessor        
Operating Lease, Option to extend     true  
Operating Lease, Option to terminate     true  
Lessor, practical expedient, single lease component true   true  
Components of lease revenues        
Fixed lease revenues $ 17,361,000   $ 52,441,000  
Variable lease revenues 2,853,000   9,138,000  
Lease revenues 20,214,000   61,579,000  
Amortization of intangibles relating to leases, net 200,000   709,000 $ 1,605,000
Write-off of unbilled rent receivable     382,000 74,000
Revenues 20,414,000 $ 19,570,000 62,288,000 58,856,000
Property in Philadelphia, Pennsylvania        
Components of lease revenues        
Write-off of unbilled rent receivable 380,000   380,000  
Rental income, net        
Components of lease revenues        
Revenues $ 20,414,000 19,198,000 $ 62,288,000 58,484,000
Tenant reimbursements        
Components of lease revenues        
Revenues   $ 2,005,000   $ 5,983,000