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OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Intangible liabilities |  |  |
Net | $ (1,028) |  | $ (1,282)
Future accretion of acquisition related intangible liabilities |  |  |
Net | (1,028) |  | (1,282)
Acquired Below-Market Leases |  |  |
Intangible liabilities |  |  |
Gross balance | (2,368) |  | (3,521)
Accumulated amortization | 1,340 |  | 2,239
Net | $ (1,028) |  | $ (1,282)
Average useful life (in years) | 4 years |  | 4 years
Future accretion of acquisition related intangible liabilities |  |  |
2020 (Nine months ending December 31, 2020) | $ (447) |  |
2021 | (347) |  |
2022 | (234) |  |
2023 | 0 |  |
2024 | 0 |  |
Thereafter | 0 |  |
Net | (1,028) |  | $ (1,282)
Acquired Above-Market Leases |  |  |
Intangible assets |  |  |
Gross balance | 37 |  | 74
Accumulated amortization | (11) |  | (42)
Net | $ 26 |  | $ 32
Average useful life (in years) | 7 years |  | 5 years
Amortization |  |  |
Amortization expense | $ 6 | $ 21 |
Future amortization of acquisition related intangible assets |  |  |
2020 (Nine months ending December 31, 2020) | 3 |  |
2021 | 5 |  |
2022 | 5 |  |
2023 | 6 |  |
2024 | 6 |  |
Thereafter | 1 |  |
Net | 26 |  | $ 32
Acquired In-Place Leases |  |  |
Intangible assets |  |  |
Gross balance | 12,135 |  | 13,653
Accumulated amortization | (8,305) |  | (9,382)
Net | $ 3,830 |  | $ 4,271
Average useful life (in years) | 9 years |  | 8 years
Amortization |  |  |
Amortization expense | $ 441 | 601 |
Future amortization of acquisition related intangible assets |  |  |
2020 (Nine months ending December 31, 2020) | 908 |  |
2021 | 899 |  |
2022 | 663 |  |
2023 | 375 |  |
2024 | 375 |  |
Thereafter | 610 |  |
Net | 3,830 |  | $ 4,271
Trade Name and License |  |  |
Intangible assets |  |  |
Gross balance | 2,957 |  | 2,957
Accumulated amortization | 0 |  | 0
Net | 2,957 |  | 2,957
Future amortization of acquisition related intangible assets |  |  |
Net | 2,957 |  | $ 2,957
Rental and Other Property Income | Acquired Below-Market Leases |  |  |
Amortization |  |  |
Amortization expense | $ 254 | $ 513 |

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