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Combined Guarantor Subsidiaries - Summary of Significant Accounting Policies - Intangibles and Balance Sheet Classifications (Details) - Guarantor Subsidiaries - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts payable and accrued liabilities: |  |
Cost | $ 27,831 | $ 28,942
Accumulated Amortization | (22,729) | (21,805)
Above-market leases |  |
Intangible lease assets and other assets: |  |
Cost | 11,522 | 12,307
Accumulated Amortization | (10,813) | (11,198)
In-place leases |  |
Intangible lease assets and other assets: |  |
Cost | 42,905 | 46,229
Accumulated Amortization | (36,724) | (37,381)
Tenant relationships |  |
Intangible lease assets and other assets: |  |
Cost | 26,068 | 27,866
Accumulated Amortization | $ (4,492) | $ (4,880)

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