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INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
INTANGIBLE ASSETS | INTANGIBLE ASSETS As of December 31, 2020 and 2019, intangible assets that will continue to be amortized and those not amortized were:
| Weighted Average Amortization Period (years) |  | 2020 |  | 2019
| Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Amortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Water pumping rights | usage |  | $ | 1,084 |  |  | $ | 122 |  |  | $ | 962 |  |  | $ | 1,084 |  |  | $ | 116 |  |  | $ | 968 |
Water planning studies | 12 |  | 20,686 |  |  | 14,119 |  |  | 6,567 |  |  | 18,475 |  |  | 12,950 |  |  | 5,525 |
Leasehold improvements and other | 21 |  | 1,930 |  |  | 1,206 |  |  | 724 |  |  | 1,519 |  |  | 889 |  |  | 630 |
Total |  |  | $ | 23,700 |  |  | $ | 15,447 |  |  | $ | 8,253 |  |  | $ | 21,078 |  |  | $ | 13,955 |  |  | $ | 7,123 |
Unamortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual water rights and other |  |  | $ | 3,867 |  |  | $ | — |  |  | $ | 3,867 |  |  | $ | 3,776 |  |  | $ | — |  |  | $ | 3,776 |
Water pumping rights usage is the amount of water pumped from aquifers to be treated and distributed to customers. For the year ended December 31, 2020, 2019, and 2018, amortization of intangible assets was $1.1 million, $1.5 million, $1.7 million, respectively. Estimated future amortization expense related to intangible assets are shown in the table below:
Year Ending December 31, | Estimated Future Amortization Expense Related to Intangible Assets
2021 | $ | 1,168 |
2022 | 1,055 |
2023 | 867 |
2024 | 726 |
2025 | 599 |
Thereafter | 3,838 |
Total | $ | 8,253 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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