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Summary of Significant Accounting Policies Lessor (Details)
Sep. 30, 2019
Inline Tenants | Minimum  
Lessor, Lease, Description [Line Items]  
Lessor, Operating Lease, Term of Contract 2 years
Inline Tenants | Maximum  
Lessor, Lease, Description [Line Items]  
Lessor, Operating Lease, Term of Contract 10 years
Anchor Tenants | Minimum  
Lessor, Lease, Description [Line Items]  
Lessor, Operating Lease, Term of Contract 3 years
Anchor Tenants | Maximum  
Lessor, Lease, Description [Line Items]  
Lessor, Operating Lease, Term of Contract 13 years