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OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Intangible liabilities |  |  |  |  |
Net | $ (1,938) |  | $ (1,938) |  | $ (2,872)
Future accretion of acquisition related intangible liabilities |  |  |  |  |
Net | (1,938) |  | (1,938) |  | (2,872)
Acquired Below-Market Leases |  |  |  |  |
Intangible liabilities |  |  |  |  |
Gross balance | (4,757) |  | (4,757) |  | (6,618)
Accumulated amortization | 2,819 |  | 2,819 |  | 3,746
Net | (1,938) |  | $ (1,938) |  | $ (2,872)
Average useful life (in years) |  |  | 3 years |  | 4 years
Future accretion of acquisition related intangible liabilities |  |  |  |  |
2019 (Six months ending December 31, 2019) | (656) |  | $ (656) |  |
2020 | (701) |  | (701) |  |
2021 | (347) |  | (347) |  |
2022 | (234) |  | (234) |  |
2023 | 0 |  | 0 |  |
Thereafter | 0 |  | 0 |  |
Net | (1,938) |  | (1,938) |  | $ (2,872)
Acquired Above-Market Leases |  |  |  |  |
Intangible assets |  |  |  |  |
Gross balance | 146 |  | 146 |  | 146
Accumulated amortization | (93) |  | (93) |  | (51)
Net | 53 |  | $ 53 |  | $ 95
Average useful life (in years) |  |  | 3 years |  | 3 years
Amortization |  |  |  |  |
Amortization expense | 21 | $ 14 | $ 42 | $ 26 |
Future amortization of acquisition related intangible assets |  |  |  |  |
2019 (Six months ending December 31, 2019) | 21 |  | 21 |  |
2020 | 9 |  | 9 |  |
2021 | 5 |  | 5 |  |
2022 | 5 |  | 5 |  |
2023 | 6 |  | 6 |  |
Thereafter | 7 |  | 7 |  |
Net | 53 |  | 53 |  | $ 95
Acquired In-Place Leases |  |  |  |  |
Intangible assets |  |  |  |  |
Gross balance | 14,054 |  | 14,054 |  | 16,210
Accumulated amortization | (8,812) |  | (8,812) |  | (9,731)
Net | 5,242 |  | $ 5,242 |  | $ 6,479
Average useful life (in years) |  |  | 8 years |  | 8 years
Amortization |  |  |  |  |
Amortization expense | 540 | 930 | $ 1,141 | 1,842 |
Future amortization of acquisition related intangible assets |  |  |  |  |
2019 (Six months ending December 31, 2019) | 971 |  | 971 |  |
2020 | 1,349 |  | 1,349 |  |
2021 | 899 |  | 899 |  |
2022 | 663 |  | 663 |  |
2023 | 375 |  | 375 |  |
Thereafter | 985 |  | 985 |  |
Net | 5,242 |  | 5,242 |  | $ 6,479
Trade Name and License |  |  |  |  |
Intangible assets |  |  |  |  |
Gross balance | 2,957 |  | 2,957 |  | 2,957
Accumulated amortization | 0 |  | 0 |  | 0
Net | 2,957 |  | 2,957 |  | 2,957
Future amortization of acquisition related intangible assets |  |  |  |  |
Net | 2,957 |  | 2,957 |  | $ 2,957
Rental and Other Property Income | Acquired Below-Market Leases |  |  |  |  |
Amortization |  |  |  |  |
Amortization expense | $ 421 | $ 520 | $ 934 | $ 1,233 |

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