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Regulatory Matters (Details 3) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Regulatory matters: |  |
Other Liabilities, Current | $ 10,209 | $ 18,760
GSWC |  |
Regulatory matters: |  |
Under (over) collection | 132,696 | 125,704
Other Liabilities, Current | 9,921 | 18,659
Other Regulatory Assets Net [Member] | GSWC |  |
Regulatory matters: |  |
Under (over) collection | 21,954 | 23,259
Low income rate assistance balancing accounts | GSWC |  |
Regulatory matters: |  |
Under (over) collection | 8,699 | 9,109
Pension Costs and Other Postretirement Benefit Costs [Member] | GSWC |  |
Regulatory matters: |  |
Regulatory Assets | 19,800 |
Under (over) collection | 21,996 | $ 43,426
Two-way pension balancing account | Pension Costs and Other Postretirement Benefit Costs [Member] | GSWC |  |
Regulatory matters: |  |
Regulatory Assets | 2,200 |
Two-way pension balancing account | Purchase, production, distribution and sale of water | Pension Costs and Other Postretirement Benefit Costs [Member] | GSWC |  |
Regulatory matters: |  |
Regulatory Assets | 2,500 |
Two-way pension balancing account | Electric | Pension Costs and Other Postretirement Benefit Costs [Member] | GSWC |  |
Regulatory matters: |  |
Regulatory Assets | $ 319 |

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