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Intangible Assets and Liabilities - Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Intangible Assets [Line Items] |  |
Intangible assets, total cost | $ 97,319 | $ 177,581
Intangible assets, accumulated amortization | (42,057) | (92,730)
Intangible assets, net | 55,262 | 84,851
Intangible liabilities, net | 29,526 | 44,757
Acquired lease intangibles, accumulated amortization | (10,949) | (22,494)
Acquired lease intangibles, net | 18,577 | 22,263
In-place lease value |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 144,957 | 167,357
Intangible assets, accumulated amortization | (78,187) | (84,123)
Intangible assets, net | 66,770 | 83,234
Tenant relationship value |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 5,142 | 5,268
Intangible assets, accumulated amortization | (4,859) | (4,815)
Intangible assets, net | 283 | 453
Above market leases acquired |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 4,685 | 4,956
Intangible assets, accumulated amortization | (3,979) | (3,792)
Intangible assets, net | 706 | $ 1,164
Not Held for Sale |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 154,784 |
Intangible assets, accumulated amortization | (87,025) |
Intangible assets, net | 67,759 |
Acquired lease intangibles, net | 19,190 |
Held-for-sale |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 57,465 |
Intangible assets, accumulated amortization | (44,968) |
Intangible assets, net | 12,497 |
Intangible liabilities, net | 5,225 |
Acquired lease intangibles, accumulated amortization | (4,612) |
Acquired lease intangibles, net | 613 |
Below market leases acquired |  |
Intangible Assets [Line Items] |  |
Intangible liabilities, net | 34,751 |
Acquired lease intangibles, accumulated amortization | (15,561) |
Acquired lease intangibles, net | $ 19,190 |

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