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Summary of Significant Accounting Policies - Revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Increase in minimum rent due to straight-line rent adjustment $ 24,789 $ 10,533 $ 11,755
Minimum      
Revenues      
Management fees as a percentage of gross monthly rental revenue 1.50%    
Maximum      
Revenues      
Management fees as a percentage of gross monthly rental revenue 4.00%