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Regulatory Matters 3 (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Regulatory matters: |  |
Other Liabilities, Current | $ 15,109 | $ 11,297
GSWC |  |
Regulatory matters: |  |
Under (over) collection | 2,042 | 146,281
Other Liabilities, Current | 14,705 | 10,925
Other Regulatory Assets Net [Member] | GSWC |  |
Regulatory matters: |  |
Under (over) collection | 14,875 | 17,633
Low income rate assistance balancing accounts | GSWC |  |
Regulatory matters: |  |
Under (over) collection | 5,972 | 8,272
Pension Costs and Other Postretirement Benefit Costs | GSWC |  |
Regulatory matters: |  |
Regulatory asset authorized under settlement | 34,700 |
Under (over) collection | 33,019 | $ 28,118
Two-way pension balancing account | Pension Costs and Other Postretirement Benefit Costs | GSWC |  |
Regulatory matters: |  |
Regulatory asset authorized under settlement | 1,700 |
Two-way pension balancing account | Purchase, production, distribution and sale of water | Pension Costs and Other Postretirement Benefit Costs | GSWC |  |
Regulatory matters: |  |
Regulatory asset authorized under settlement | (588) |
Two-way pension balancing account | Electric | Pension Costs and Other Postretirement Benefit Costs | GSWC |  |
Regulatory matters: |  |
Regulatory asset authorized under settlement | $ (1,060) |

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