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Employee Benefit Plans Employee Benefit Plans 5 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Pension Benefits |  |  |
Regulatory Adjustment: |  |  |
Regulatory adjustment - over collection | $ (859) | $ (523) | $ (1,622)
GSWC | Pension Benefits |  |  |
Regulatory Adjustment: |  |  |
Regulatory adjustment - over collection | (859) | $ (523) | $ (1,600)
Pension Costs and Other Postretirement Benefit Costs | GSWC |  |  |
Regulatory Adjustment: |  |  |
Regulatory assets | 26,800 |  |
Two-way pension balancing account | Pension Costs and Other Postretirement Benefit Costs | GSWC |  |  |
Regulatory Adjustment: |  |  |
Regulatory assets | $ 1,300 |  |

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