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Utility Plant and Intangible Assets - Schedule of Components (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Intangible assets |  |  |
Total intangible assets |  | $ 32,345 | $ 31,938
Less — accumulated amortization |  | (27,275) | (26,811)
Intangible assets, net of amortization |  | 5,070 | 5,127
Intangible assets not subject to amortization | [1] | 383 | 383
Total utility plant, at cost |  | $ 2,279,621 | $ 2,178,349
Conservation programs |  |  |
Intangible assets |  |  |
Weighted Average Amortization Period (in years) |  | 3 years | 3 years
Total intangible assets |  | $ 9,486 | $ 9,486
Water and water service rights |  |  |
Intangible assets |  |  |
Weighted Average Amortization Period (in years) |  | 30 years | 30 years
Total intangible assets | [2] | $ 8,695 | $ 8,695
Water planning studies |  |  |
Intangible assets |  |  |
Weighted Average Amortization Period (in years) |  | 14 years | 14 years
Total intangible assets |  | $ 14,164 | $ 13,757
GSWC |  |  |
Intangible assets |  |  |
Total intangible assets |  | 30,536 | 30,129
Less — accumulated amortization |  | (26,294) | (25,374)
Intangible assets, net of amortization |  | 4,242 | 4,755
Intangible assets not subject to amortization | [1] | $ 382 | $ 382
GSWC | Conservation programs |  |  |
Intangible assets |  |  |
Weighted Average Amortization Period (in years) |  | 3 years | 3 years
Total intangible assets |  | $ 9,486 | $ 9,486
GSWC | Water and water service rights |  |  |
Intangible assets |  |  |
Weighted Average Amortization Period (in years) |  | 30 years | 30 years
Total intangible assets | [2] | $ 8,124 | $ 8,124
GSWC | Water planning studies |  |  |
Intangible assets |  |  |
Weighted Average Amortization Period (in years) |  | 14 years | 14 years
Total intangible assets |  | $ 12,926 | $ 12,519
Intangible assets | American States Utility Services |  |  |
Intangible assets |  |  |
Total utility plant, at cost |  | $ 571 | $ 571
[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, 2023 and 2022.

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