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Summary of Significant Accounting Policies - Business Overview/Segment Reporting (Details)
$ in Thousands, ft² in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
ft²
state
real_estate_property
Jan. 01, 2019
USD ($)
lease
Dec. 31, 2018
USD ($)
Disaggregation of Revenue [Line Items]          
Value of real estate property investments and mortgages     $ 566,300    
Number of real estate properties | real_estate_property     111    
Number of states in which real estate investments are in | state     32    
Area of real estate property (in square feet) | ft²     2.5    
Operating lease ROU assets     $ 140   $ 0
Tenant reimbursements          
Disaggregation of Revenue [Line Items]          
Other operating interest $ 1,700 $ 4,700      
ASU 2016-02          
Disaggregation of Revenue [Line Items]          
Operating lease ROU assets       $ 100  
Operating lease liabilities       $ 100  
Number of ground leases | lease       1