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Summary of Significant Accounting Policies - Business Overview/Segment Reporting (Details)
$ in Thousands, ft² in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
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   $ 478,400    
Number of real estate properties | real_estate_property   105    
Number of states in which real estate investments are in | state   29    
Area of real estate property (in square feet) | ft²   2.3    
Operating lease ROU assets   $ 141   $ 0
Tenant reimbursements        
Disaggregation of Revenue [Line Items]        
Revenue $ 1,400      
ASU 2016-02        
Disaggregation of Revenue [Line Items]        
Operating lease ROU assets     $ 100  
Operating lease liabilities     $ 100  
Number of ground leases | lease     1