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Utility Plant and Intangible Assets 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Intangible assets |  |  |  |
Total utility plant, at cost |  | $ 1,780,110 | $ 1,674,527 |
Total amortized intangible assets |  | 30,822 | 31,192 |
Less - accumulated amortization |  | (24,399) | (23,331) |
Intangible assets, net of amortization |  | 6,423 | 7,861 |
Unamortized intangible assets | [1] | 422 | 422 |
Amortization of intangible assets |  | 1,100 | $ 1,500 | $ 1,900
Estimated future consolidated amortization expenses related to intangible assets |  |  |  |
2014 |  | 189 |  |
2015 |  | 90 |  |
2016 |  | 12 |  |
2017 |  | 12 |  |
2018 |  | 12 |  |
Total |  | $ 315 |  |
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 | $ 8,695 |
Water planning studies |  |  |  |
Intangible assets |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 14 years | 14 years |
Total amortized intangible assets |  | $ 12,641 | $ 13,011 |
GSWC |  |  |  |
Intangible assets |  |  |  |
Total utility plant, at cost |  | 1,755,599 | 1,658,935 |
Total amortized intangible assets |  | 30,251 | 30,621 |
Less - accumulated amortization |  | (24,268) | (23,221) |
Intangible assets, net of amortization |  | 5,983 | 7,400 |
Unamortized intangible assets | [1] | $ 404 | $ 404 |
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 |  | $ 12,641 | $ 13,011 |
Intangible Assets [Member] | American States Utility Services [Member] |  |  |  |
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, 2018 and 2017.

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