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Regulatory Matters 3 (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Regulatory matters: |  |
Other Liabilities, Current | $ 11,297 | $ 10,209
GSWC |  |
Regulatory matters: |  |
Under (over) collection | 146,281 | 132,696
Other Liabilities, Current | 10,925 | 9,921
Other Regulatory Assets Net [Member] | GSWC |  |
Regulatory matters: |  |
Under (over) collection | 17,633 | 21,235
Low income rate assistance balancing accounts | GSWC |  |
Regulatory matters: |  |
Under (over) collection | 8,272 | 8,699
Pension Costs and Other Postretirement Benefit Costs | GSWC |  |
Regulatory matters: |  |
Regulatory assets | 26,800 |
Under (over) collection | 28,118 | $ 21,996
Two-way pension balancing account | Pension Costs and Other Postretirement Benefit Costs | GSWC |  |
Regulatory matters: |  |
Regulatory assets | 1,300 |
Two-way pension balancing account | Purchase, production, distribution and sale of water | Pension Costs and Other Postretirement Benefit Costs | GSWC |  |
Regulatory matters: |  |
Regulatory assets | 1,900 |
Two-way pension balancing account | Electric | Pension Costs and Other Postretirement Benefit Costs | GSWC |  |
Regulatory matters: |  |
Regulatory assets | $ (617) |

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