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Combined Guarantor Subsidiaries - Summary of Significant Accounting Policies - Intangibles and Balance Sheet Classifications (Details) - Guarantor Subsidiaries - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts payable and accrued liabilities: |  |
Cost | $ 27,975 | $ 28,942
Accumulated Amortization | (21,683) | (21,805)
Above-market leases |  |
Intangible lease assets and other assets: |  |
Cost | 12,064 | 12,307
Accumulated Amortization | (11,124) | (11,198)
In-place leases |  |
Intangible lease assets and other assets: |  |
Cost | 44,321 | 46,229
Accumulated Amortization | (36,547) | (37,381)
Tenant relationships |  |
Intangible lease assets and other assets: |  |
Cost | 25,818 | 27,866
Accumulated Amortization | $ (4,455) | $ (4,880)

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