Quarterly report pursuant to Section 13 or 15(d)

Lease Commitments - Payments for Ground Leases (Details)

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Lease Commitments - Payments for Ground Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lessor, Lease, Description [Line Items]    
Total ground leases $ 265 $ 226
Amscot    
Lessor, Lease, Description [Line Items]    
Total ground leases $ 6 6
Expiration Year 2045  
Beaver Ruin Village    
Lessor, Lease, Description [Line Items]    
Total ground leases $ 14 14
Expiration Year 2054  
Beaver Ruin Village II    
Lessor, Lease, Description [Line Items]    
Total ground leases $ 6 6
Expiration Year 2056  
Moncks Corner    
Lessor, Lease, Description [Line Items]    
Total ground leases $ 30 30
Expiration Year 2040  
Devine Street (1)    
Lessor, Lease, Description [Line Items]    
Total ground leases $ 99 99
Expiration Year 2051  
JANAF    
Lessor, Lease, Description [Line Items]    
Total ground leases $ 68 71
Expiration Year 2069  
Ground leases variable percentage rent $ 31 34
Riversedge North    
Lessor, Lease, Description [Line Items]    
Total ground leases $ 42 $ 0
Expiration Year 2030