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Utility Plant and Intangible Assets 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Intangible assets |  |  |  |
Property, Plant and Equipment, Gross |  | $ 1,674,527 | $ 1,620,325 |
Total amortized intangible assets |  | 31,192 | 37,678 |
Less - accumulated amortization |  | (23,331) | (28,108) |
Intangible assets, net of amortization |  | 7,861 | 9,570 |
Unamortized intangible assets | [1] | 422 | 427 |
Amortization of intangible assets |  | 1,500 | 1,900 | $ 1,800
Estimated future consolidated amortization expenses related to intangible assets |  |  |  |
2014 |  | 1,325 |  |
2015 |  | 1,131 |  |
2016 |  | 1,003 |  |
2017 |  | 949 |  |
2018 |  | 949 |  |
Total |  | $ 5,357 |  |
Conservation [Member] |  |  |  |
Intangible assets |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 3 years |  |
Total amortized intangible assets |  | $ 9,486 | 9,496 |
Water and water service rights |  |  |  |
Intangible assets |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 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 |  |
Total amortized intangible assets |  | $ 13,011 | 19,487 |
GSWC |  |  |  |
Intangible assets |  |  |  |
Property, Plant and Equipment, Gross |  | 1,658,935 | 1,608,428 |
Total amortized intangible assets |  | 30,621 | 37,107 |
Less - accumulated amortization |  | (23,221) | (28,001) |
Intangible assets, net of amortization |  | 7,400 | 9,106 |
Unamortized intangible assets | [1] | $ 404 | 409 |
GSWC | Conservation [Member] |  |  |  |
Intangible assets |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 3 years |  |
Total amortized intangible assets |  | $ 9,486 | 9,496 |
GSWC | Water and water service rights |  |  |  |
Intangible assets |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 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 |  |
Total amortized intangible assets |  | $ 13,011 | 19,487 |
Intangible Assets [Member] | American States Utility Services [Member] |  |  |  |
Intangible assets |  |  |  |
Property, Plant and Equipment, Gross |  | $ 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, 2017 and 2016.

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