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Long-Term Debt 3 (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 | Dec. 31, 2014 USD ($) | Oct. 31, 2009 USD ($)
Notes Payable 3.45 Percent Due 2029 [Member] |  |  |  |
Long-term debt |  |  |  |
Interest rate (as a percent) | 3.45% | 3.45% |  |
GSWC |  |  |  |
Long-term debt |  |  |  |
Ratio of Indebtedness to EBITDA | 2.5 |  |  |
GSWC | Maximum |  |  |  |
Long-term debt |  |  |  |
Ratio of Indebtedness to EBITDA | 8 |  |  |
GSWC | Private Placement Notes [Member] |  |  |  |
Long-term debt |  |  |  |
Debt Instrument Covenant Interest Coverage Ratio | 400.00% |  |  |
GSWC | Private Placement Notes [Member] | Minimum [Member] |  |  |  |
Long-term debt |  |  |  |
Debt Instrument Covenant Interest Coverage Ratio | 200.00% |  |  |
GSWC | Notes Payable 3.45 Percent Due 2029 [Member] |  |  |  |
Long-term debt |  |  |  |
Debt Instrument, Face Amount | $ 15,000,000 |  | $ 15,000,000 |
Interest rate (as a percent) | 3.45% | 3.45% | 3.45% |
GSWC | American Recovery and Reinvestment Act Obligation due 2033 |  |  |  |
Long-term debt |  |  |  |
Maximum amount of loan that can be borrowed |  |  |  | $ 9,000,000.0
Interest rate (as a percent) | 2.50% |  |  |
Maturity term | 20 years |  |  |
Loan proceeds received for reimbursement of costs of conversion | $ 8,600,000 |  |  |
GSWC | American Recovery and Reinvestment Act Obligation due 2033 | Letters of credit to CDHP |  |  |  |
Long-term debt |  |  |  |
Amount of debt issued | $ 5,400,000.0 |  |  |

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