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Organization and Significant Accounting Policies (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 17, 2017
$ / shares
shares
Dec. 31, 2020
USD ($)
a
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Organization and Significant Accounting Policies      
Area of real estate property | a   155,000  
Par value | $ / shares   $ 0.01 $ 0.01
Common stock, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01
Below Market Lease      
Below market lease, accumulated amortization | $   $ 0.0  
Tenant relationship intangibles | $   1.3 $ 1.3
Tenant relationship intangibles, accumulated amortization | $   $ 1.3 $ 1.2
Common Units | Operating Partnership      
Organization and Significant Accounting Policies      
Ownership interest (as a percent)   94.90%  
TRS      
Organization and Significant Accounting Policies      
Area of real estate property | a   3,676  
Series B Participating Preferred Stock      
Organization and Significant Accounting Policies      
Shares issued under underwriting agreement | shares 6,037,500    
Preference dividend (as a percent) 6.00% 6.00%  
Par value | $ / shares $ 0.01