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INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Intangible Assets [Line Items] |  |
Intangible assets, total cost | $ 177,581 | $ 196,417
Intangible assets, accumulated amortization | (92,730) | (65,069)
Intangible assets, net | 84,851 | 131,348
Acquired lease intangibles, net | 22,263 | 31,783
Below market leases acquired |  |
Intangible Assets [Line Items] |  |
Acquired lease intangibles, gross | 44,757 | 49,655
Acquired lease intangibles, accumulated amortization | (22,494) | (17,872)
Acquired lease intangibles, net | 22,263 | 31,783
In-place lease value |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 167,357 | 181,887
Intangible assets, accumulated amortization | (84,123) | (53,376)
Intangible assets, net | 83,234 | 128,511
Tenant relationship value |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 5,268 | 9,564
Intangible assets, accumulated amortization | (4,815) | (8,551)
Intangible assets, net | 453 | 1,013
Above market leases acquired |  |
Intangible Assets [Line Items] |  |
Intangible assets, total cost | 4,956 | 4,966
Intangible assets, accumulated amortization | (3,792) | (3,142)
Intangible assets, net | $ 1,164 | $ 1,824

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