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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
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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)

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