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Utility Plant and Intangible Assets 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Intangible assets |  |  |  |
Total amortized intangible assets |  | $ 30,439 | $ 30,321 |
Less - accumulated amortization |  | (26,401) | (24,460) |
Intangible assets, net of amortization |  | 4,038 | 5,861 |
Unamortized intangible assets | [1] | 400 | 399 |
Amortization of intangible assets |  | 700 | $ 654 | $ 1,300
Estimated future consolidated amortization expenses related to intangible assets |  |  |  |
2022 |  | 672 |  |
2023 |  | 672 |  |
2024 |  | 672 |  |
2025 |  | 672 |  |
2026 |  | 672 |  |
Total |  | $ 3,360 |  |
Conservation [Member] |  |  |  |
Intangible assets |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 3 years | 3 years |
Total amortized intangible assets |  | $ 9,486 | $ 9,486 |
Water and water service rights |  |  |  |
Intangible assets |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 30 years | 30 years |
Total amortized intangible assets | [2] | $ 8,695 | $ 8,694 |
Water planning studies |  |  |  |
Intangible assets |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 14 years | 14 years |
Total amortized intangible assets |  | $ 12,258 | $ 12,141 |
GSWC |  |  |  |
Intangible assets |  |  |  |
Total amortized intangible assets |  | 28,629 | 28,508 |
Less - accumulated amortization |  | (25,109) | (24,305) |
Intangible assets, net of amortization |  | 3,520 | 4,203 |
Unamortized intangible assets | [1] | $ 399 | $ 399 |
GSWC | Conservation [Member] |  |  |  |
Intangible assets |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 3 years | 3 years |
Total amortized intangible assets |  | $ 9,486 | $ 9,486 |
GSWC | Water and water service rights |  |  |  |
Intangible assets |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 30 years | 30 years |
Total amortized intangible assets | [2] | $ 8,124 | $ 8,124 |
GSWC | Water planning studies |  |  |  |
Intangible assets |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 14 years | 14 years |
Total amortized intangible assets |  | $ 11,019 | $ 10,898 |
[1] | The intangible assets not subject to amortization primarily consist of organization and consent fees.
[2] | Includes intangible assets of $571,000 for contracted services included in "Other Property and Investments" on the consolidated balance sheets as of December 31, 2021 and 2020.

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