Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Disaggregation of Revenues (Details)

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Summary of Significant Accounting Policies - Disaggregation of Revenues (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Rental revenues $ 15,770 $ 15,821
Asset management fees 13 125
Subtotal 16,085 16,391
Credit losses on operating lease receivables (90) (98)
Total Revenue 15,995 16,293
Minimum rent    
Disaggregation of Revenue [Line Items]    
Rental revenues 12,461 12,610
Tenant reimbursements - variable lease revenue    
Disaggregation of Revenue [Line Items]    
Variable lease revenue 3,287 3,222
Percentage rent - variable lease revenue    
Disaggregation of Revenue [Line Items]    
Variable lease revenue 112 87
Lease termination fees    
Disaggregation of Revenue [Line Items]    
Non-lease revenues 49 246
Asset management fees    
Disaggregation of Revenue [Line Items]    
Asset management fees 13 125
Commissions    
Disaggregation of Revenue [Line Items]    
Non-lease revenues 42 14
Other    
Disaggregation of Revenue [Line Items]    
Non-lease revenues $ 121 $ 87