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Leases - Narrative (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
property
state
brand
retail_sector
Dec. 31, 2019
USD ($)
Lessor, Lease, Description [Line Items]    
Number of single-tenant retail net leased properties owned | property 203  
Number of states in which entity operates | state 38  
Number of brands in which tenants represent | brand 56  
Number of retail sectors in which tenants represent | retail_sector 23  
Write-offs of doubtful accounts | $ $ 0 $ 200,000
Minimum    
Lessor, Lease, Description [Line Items]    
Remaining term of leases 2 years  
Maximum    
Lessor, Lease, Description [Line Items]    
Remaining term of leases 34 years