XML 92 R77.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Employee Benefit Plans Employee Benefit Plans 8 (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits |  |  |
Employee benefit plans |  |  |
Defined Benefit Plan Number of Highest Consecutive Years Average Earnings Used in Computing Retirement Benefit | 5 years |  |
Fair value of post-retirement plan assets | $ 192,477 | $ 162,529 | $ 173,648
Pension Benefits | Cash equivalents |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 600 | 590 |
Pension Benefits | Fixed income fund |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 74,123 | 70,642 |
Pension Benefits | U.S. large cap funds |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 47,132 | 46,133 |
Post-Retirement Medical Benefits |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 11,271 | 10,010 | $ 11,053
Post-Retirement Medical Benefits | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 11,271 | 10,010 |
Post-Retirement Medical Benefits | Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Post-Retirement Medical Benefits | Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Post-Retirement Medical Benefits | Cash equivalents | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 69 | 263 |
Post-Retirement Medical Benefits | Cash equivalents | Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Post-Retirement Medical Benefits | Cash equivalents | Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Post-Retirement Medical Benefits | Fixed income fund | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 4,279 | 3,871 |
Post-Retirement Medical Benefits | Fixed income fund | Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Post-Retirement Medical Benefits | Fixed income fund | Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 | 0 |
Post-Retirement Medical Benefits | U.S. large cap funds | Level 1 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 6,923 | 5,876 |
Post-Retirement Medical Benefits | U.S. large cap funds | Level 2 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 |  |
Post-Retirement Medical Benefits | U.S. large cap funds | Level 3 |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 0 |  |
Fair Value | Post-Retirement Medical Benefits |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 11,271 | 10,010 |
Fair Value | Post-Retirement Medical Benefits | Cash equivalents |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 69 | 263 |
Fair Value | Post-Retirement Medical Benefits | Fixed income fund |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | 4,279 | 3,871 |
Fair Value | Post-Retirement Medical Benefits | U.S. large cap funds |  |  |
Employee benefit plans |  |  |
Fair value of post-retirement plan assets | $ 6,923 | $ 5,876 |
Minimum | Post-Retirement Medical Benefits | Fixed income fund |  |  |
Employee benefit plans |  |  |
Investments Maturity Period | 1 year |  |
Maximum | Post-Retirement Medical Benefits | Fixed income fund |  |  |
Employee benefit plans |  |  |
Investments Maturity Period | 20 years |  |

X
- Definition Represents the number of highest consecutive years' average earnings used in computing the retirement benefit. + References No definition available. + Details
Name: | awr_DefinedBenefitPlanNumberOfHighestConsecutiveYearsAverageEarningsUsedInComputingRetirementBenefit
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maturity period of investments. + References No definition available. + Details
Name: | awr_InvestmentsMaturityPeriod
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=awr_USLargeCapStocksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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