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Combined Guarantor Subsidiaries - Summary of Significant Accounting Policies - Intangibles and Balance Sheet Classifications (Details) - Guarantor Subsidiaries - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Accounts payable and accrued liabilities:    
Cost $ 27,648,000 $ 28,942,000
Accumulated Amortization (23,092,000) (21,805,000)
Above-market leases    
Intangible lease assets and other assets:    
Cost 11,389,000 12,307,000
Accumulated Amortization (10,766,000) (11,198,000)
In-place leases    
Intangible lease assets and other assets:    
Cost 42,327,000 46,229,000
Accumulated Amortization (36,821,000) (37,381,000)
Tenant relationships    
Intangible lease assets and other assets:    
Cost 26,068,000 27,866,000
Accumulated Amortization $ (4,828,000) $ (4,880,000)