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v3.20.4

Long-Term Debt 3 (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2009 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2013 | Dec. 31, 2014 USD ($) | Oct. 31, 2009 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 260,000,000.0 |  |  |  |  |
Loan proceeds received for reimbursement of costs of conversion |  | $ 159,413,000 | $ 0 | $ 0 |  |  |
3.45% notes due 2029 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.45% | 3.45% |  |  |  |
GSWC |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Ratio of Indebtedness to EBITDA |  | 3.1 |  |  |  |  |
Loan proceeds received for reimbursement of costs of conversion |  | $ 159,413,000 | $ 0 | $ 0 |  |  |
GSWC | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Ratio of Indebtedness to EBITDA |  | 8 |  |  |  |  |
GSWC | Private Placement Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument Covenant Interest Coverage Ratio |  | 4 |  |  |  |  |
GSWC | Private Placement Notes [Member] | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument Covenant Interest Coverage Ratio |  | 2 |  |  |  |  |
GSWC | 3.45% notes due 2029 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 15,000,000.0 |
Interest rate (as a percent) |  | 3.45% | 3.45% |  |  |  |
GSWC | American Recovery and Reinvestment Act Obligation due 2033 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 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 |  |  |  |  |  |

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