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Intangible Assets and Liabilities - Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Intangible Assets [Line Items] |  |
Intangible assets, total cost | $ 179,104 | $ 196,417
Intangible assets, accumulated amortization | (83,306) | (65,069)
Intangible assets, net | 95,798 | 131,348
Acquired lease intangibles, net | 24,050 | 31,783
In-place lease value |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 168,881 | 181,887
Intangible assets, accumulated amortization | (74,951) | (53,376)
Intangible assets, net | 93,930 | 128,511
Tenant relationship value |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 5,268 | 9,564
Intangible assets, accumulated amortization | (4,728) | (8,551)
Intangible assets, net | 540 | 1,013
Above market leases acquired |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 4,955 | 4,966
Intangible assets, accumulated amortization | (3,627) | (3,142)
Intangible assets, net | 1,328 | 1,824
Below market leases acquired |  |
Intangible Assets [Line Items] |  |
Acquired lease intangibles, gross | 44,876 | 49,655
Acquired lease intangibles, accumulated amortization | (20,826) | (17,872)
Acquired lease intangibles, net | $ 24,050 | $ 31,783

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