Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Fixed Annual Rental Payments on Ground Leases (Details)

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Commitments and Contingencies - Fixed Annual Rental Payments on Ground Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Loss Contingencies [Line Items]        
Total Ground Leases and Rent Expense $ 204 $ 139 $ 608 $ 416
JANAF        
Loss Contingencies [Line Items]        
Ground leases expense 65 0 $ 191 0
Long term ground leases expiration period     2069  
Amscot        
Loss Contingencies [Line Items]        
Ground leases expense 5 5 $ 14 14
Long term ground leases expiration period     2045  
Beaver Ruin Village        
Loss Contingencies [Line Items]        
Ground leases expense 11 11 $ 34 34
Long term ground leases expiration period     2054  
Beaver Ruin Village II        
Loss Contingencies [Line Items]        
Ground leases expense 5 5 $ 15 14
Long term ground leases expiration period     2056  
Leased office space Charleston, SC        
Loss Contingencies [Line Items]        
Operating leases, rent expense, net 25 25 $ 75 75
Long term ground leases expiration period     2019  
Moncks Corner        
Loss Contingencies [Line Items]        
Ground leases expense 30 30 $ 91 91
Long term ground leases expiration period     2040  
Devine Street        
Loss Contingencies [Line Items]        
Ground leases expense $ 63 $ 63 $ 188 $ 188
Long term ground leases expiration period     2035