XML 84 R68.htm IDEA: XBRL DOCUMENT
v3.20.4

Long-Term Debt (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Jul. 08, 2020 | Dec. 31, 2019 | Dec. 31, 2014 | Dec. 31, 2013
GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Ratio of Indebtedness to Net Capital | 0.4306 |  |  |  |
Ratio of Indebtedness to EBITDA | 3.1 |  |  |  |
GSWC | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Ratio of Indebtedness to Net Capital | 0.6667 |  |  |  |
Ratio of Indebtedness to EBITDA | 8 |  |  |  |
Private Placement Notes [Member] | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest coverage ratio | 4 |  |  |  |
Private Placement Notes [Member] | GSWC | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest coverage ratio | 2 |  |  |  |
9.56% notes due 2031 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) | 9.56% |  | 9.56% |  |
9.56% notes due 2031 | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 28,000,000 |  |  |  |
Interest rate (as a percent) | 9.56% |  | 9.56% |  |
Debt Instrument Redemption Premium above Treasury Yield | 55.00% |  |  |  |
9.56% notes due 2031 | GSWC | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption premium after 2021 (as a percent) | 3.00% |  |  |  |
5.87% notes due 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) | 5.87% |  | 5.87% |  |
5.87% notes due 2028 | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 40,000,000.0 |  |  |  |
Interest rate (as a percent) | 5.87% |  | 5.87% |  |
American Recovery and Reinvestment Act Obligation due 2033 | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 2.50%
3.45% notes due 2029 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) | 3.45% |  | 3.45% |  |
3.45% notes due 2029 | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 15,000,000.0 |
Interest rate (as a percent) | 3.45% |  | 3.45% |  |
Private Placement Notes [Member] | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 160,000,000.0 |  |  |
Debt Instrument Redemption Premium above Treasury Yield | 50.00% |  |  |  |
2.17% notes due 2030 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) | 2.17% |  |  |  |
2.17% notes due 2030 | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 85,000,000.0 |  |  |
Interest rate (as a percent) | 2.17% | 2.17% |  |  |
2.90% notes due 2040 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) | 2.90% |  |  |  |
2.90% notes due 2040 | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 75,000,000.0 |  |  |
Interest rate (as a percent) | 2.90% | 2.90% |  |  |

X
- Definition Represents the interest coverage ratio required to be maintained for debt instrument. + References No definition available. + Details
Name: | awr_DebtInstrumentCovenantInterestCoverageRatio
Namespace Prefix: | awr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the redemption premium as a percentage of the par value of debt instrument after the specified period. + References No definition available. + Details
Name: | awr_DebtInstrumentRedemptionPremiumAsPercentageOfParValueAfterSpecifiedPeriod
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument Redemption Premium above Treasury Yield + References No definition available. + Details
Name: | awr_DebtInstrumentRedemptionPremiumaboveTreasuryYield
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ratio of Indebtedness to EBITDA + References No definition available. + Details
Name: | awr_RatioofIndebtednesstoEBITDA
Namespace Prefix: | awr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indebtedness divided by net capital. + References No definition available. + Details
Name: | us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=awr_GoldenStateWaterCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=awr_PrivatePlacementNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=awr_NotesPayable9.56PercentDue2031Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=awr_NotesPayable5.87PercentDue2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=awr_AmericanRecoveryAndReinvestmentActObligationDue2033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=awr_NotesPayable3.45PercentDue2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=awr_PrivatePlacementNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=awr_NotesPayable217PercentDue2030Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=awr_NotesPayable290PercentDue2040Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |