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Intangible Assets and Liabilities - Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Intangible Assets [Line Items] |  |
Intangible assets, total cost | $ 93,254 | $ 177,581
Intangible assets, accumulated amortization | (42,539) | (92,730)
Intangible assets, net | 50,715 | 84,851
Intangible liabilities, net |  | 44,757
Acquired lease intangibles, accumulated amortization |  | (22,494)
Acquired lease intangibles, net | 17,500 | 22,263
In-place lease value |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 89,504 | 167,357
Intangible assets, accumulated amortization | (39,302) | (84,123)
Intangible assets, net | 50,202 | 83,234
Tenant relationship value |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 2,610 | 5,268
Intangible assets, accumulated amortization | (2,399) | (4,815)
Intangible assets, net | 211 | 453
Above market leases acquired |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 1,140 | 4,956
Intangible assets, accumulated amortization | (838) | (3,792)
Intangible assets, net | 302 | $ 1,164
Below market leases acquired |  |
Intangible Assets [Line Items] |  |
Intangible liabilities, net | 29,189 |
Acquired lease intangibles, accumulated amortization | (11,689) |
Acquired lease intangibles, net | $ 17,500 |

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