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OTHER INTANGIBLE ASSETS - Intangible Assets and Liabilities and Related Accumulated Amortization and Accretion (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Liabilities |  |
Gross balance | $ (2,368) | $ (3,521)
Accumulated amortization | 1,638 | 2,239
Net | $ (730) | $ (1,282)
Average useful life (in years) | 4 years | 4 years
Acquired Above-Market Leases |  |
Assets |  |
Gross balance | $ 37 | $ 74
Accumulated amortization | (13) | (42)
Net | $ 24 | $ 32
Average useful life (in years) | 7 years | 5 years
Acquired In-Place Leases |  |
Assets |  |
Gross balance | $ 12,135 | $ 13,653
Accumulated amortization | (8,911) | (9,382)
Net | $ 3,224 | $ 4,271
Average useful life (in years) | 9 years | 8 years
Trade Name and License |  |
Assets |  |
Gross balance | $ 2,957 | $ 2,957
Accumulated amortization | 0 | 0
Net | $ 2,957 | $ 2,957

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