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Intangible Assets and Liabilities - Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Intangible Assets [Line Items] |  |
Intangible assets, total cost | $ 163,336 | $ 177,581
Intangible assets, accumulated amortization | (87,666) | (92,730)
Intangible assets, net | 75,670 | 84,851
Acquired lease intangibles, net | 20,605 | 22,263
In-place lease value |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 153,328 | 167,357
Intangible assets, accumulated amortization | (79,024) | (84,123)
Intangible assets, net | 74,304 | 83,234
Tenant relationship value |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 5,142 | 5,268
Intangible assets, accumulated amortization | (4,775) | (4,815)
Intangible assets, net | 367 | 453
Above market leases acquired |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 4,866 | 4,956
Intangible assets, accumulated amortization | (3,867) | (3,792)
Intangible assets, net | 999 | 1,164
Below market leases acquired |  |
Intangible Assets [Line Items] |  |
Acquired lease intangibles, gross | 43,302 | 44,757
Acquired lease intangibles, accumulated amortization | (22,697) | (22,494)
Acquired lease intangibles, net | $ 20,605 | $ 22,263

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