XML 41 R28.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Regulatory Matters: (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Regulatory matters: |  |  |  |  |
Regulatory asset not accruing carrying costs | $ 59,600,000 |  | $ 59,600,000 |  |
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Increase (Decrease) in Other Regulatory Assets |  |  | 12,200,000 |  |
Pensions and other post-retirement obligations (Note 8) |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory asset not accruing carrying costs | 33,500,000 |  | 33,500,000 |  |
Derivative unrealized loss (Note 5) |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory asset not accruing carrying costs | $ 1,143,000 |  | $ 1,143,000 |  |
Cost of Capital, Proceeding for Water Regions [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Weighted Cost of Capital Percent | 8.34% |  | 8.34% |  |
Settlement Agreement Proposed Authorized Return on Equity Percentage | 9.43% |  | 9.43% |  |
Various refunds to customers |  |  |  |  |
Regulatory matters: |  |  |  |  |
Decrease in revenues requirement to reflect the newly adopted Cost of Capital for GSWC |  |  | $ 955,000 |  |
Golden State Water Company |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | $ (21,636,000) |  | $ (21,636,000) |  | $ 2,042,000
Golden State Water Company | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Investment Term |  |  | 90 days |  |
Regulatory Asset Amount Billed to Customers as Surcharges | 7,700,000 | $ 11,400,000 | $ 17,500,000 | $ 24,800,000 |
Regulatory assets | 24,264,000 |  | 24,264,000 |  | 29,556,000
Golden State Water Company | Costs deferred for future recovery on Aerojet case |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 9,809,000 |  | 9,809,000 |  | 10,656,000
Golden State Water Company | Pensions and other post-retirement obligations (Note 8) |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 31,066,000 |  | 31,066,000 |  | 33,019,000
Golden State Water Company | Derivative unrealized loss (Note 5) |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets |  |  |  |  | 2,941,000
Golden State Water Company | Low income rate assistance balancing accounts |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 3,660,000 |  | 3,660,000 |  | 5,972,000
Golden State Water Company | General rate case memorandum accounts |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 6,798,000 |  | 6,798,000 |  | 10,522,000
Golden State Water Company | Other regulatory assets |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 15,506,000 |  | 15,506,000 |  | 14,875,000
Golden State Water Company | Excess deferred income taxes (Note 7) |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 81,912,000 |  | 81,912,000 |  | (83,231,000)
Golden State Water Company | Flow-through taxes, net (Note 7) |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | (15,816,000) |  | (15,816,000) |  | (17,716,000)
Golden State Water Company | Tax Cuts and Jobs Act (Tax Act) memorandum accounts |  |  |  |  |
Regulatory matters: |  |  |  |  |
Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 impact | 944,000 |  | 7,400,000 |  |
Golden State Water Company | Water Revenue Adjustment Mechanism [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | 3,400,000 |  | 3,400,000 |  |
Golden State Water Company | Modified Cost Balancing Account [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | $ 20,900,000 |  | $ 20,900,000 |  |
Golden State Water Company | Cost of Capital, Proceeding for Water Regions [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Return on Equity Percentage | 8.90% |  | 8.90% |  |
Weighted Cost of Capital Percent | 7.91% |  | 7.91% |  |
Golden State Water Company | Tax Cuts and Jobs Act (Tax Act) memorandum accounts |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | $ (8,274,000) |  | $ (8,274,000) |  | 0
Golden State Water Company | Various refunds to customers |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory assets | (7,880,000) |  | (7,880,000) |  | $ (4,552,000)
Decrease in revenues requirement to reflect the newly adopted Cost of Capital for GSWC |  |  | 3,600,000 |  |
Electric Service Utility Operations | Tax Cuts and Jobs Act (Tax Act) memorandum accounts |  |  |  |  |
Regulatory matters: |  |  |  |  |
Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 impact | $ 125,000 |  | $ 848,000 |  |
Electric Service Utility Operations | Pending General Rate Case [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Return on Equity Percentage | 9.60% |  | 9.60% |  |
Settlement Agreement Proposed Authorized Return on Equity Percentage | 9.95% |  | 9.95% |  |
Maximum | Golden State Water Company | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 24 months |  |
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues |  |  | 24 years |  |
Minimum | Golden State Water Company | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |  |  |
Regulatory matters: |  |  |  |  |
Recovery Period for under Collection, Balances Greater than 15 Percent of Adopted Annual Revenues |  |  | 12 months |  |

X
- Definition Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 impact + References No definition available. + Details
Name: | awr_Adjustmentsrecordedtorevaluedeferredtaxesasaresultofthetaxcutandjobactof2017impact
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Decrease in revenues requirement to reflect the newly adopted Cost of Capital for GSWC + References No definition available. + Details
Name: | awr_DecreaseinrevenuesrequirementtoreflectthenewlyadoptedCostofCapitalforGSWC
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the term associated with a fixed-term security. + References No definition available. + Details
Name: | awr_InvestmentTerm
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the recovery period for under-collection balances greater than 15 percent of adopted annual revenues. + References No definition available. + Details
Name: | awr_RecoveryPeriodForUnderCollectionBalancesGreaterThan15PercentOfAdoptedAnnualRevenues
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents amount billed to customers as surcharges. + References No definition available. + Details
Name: | awr_RegulatoryAssetAmountBilledToCustomersAsSurcharges
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the regulatory asset not accruing carrying costs as of the balance sheet date. + References No definition available. + Details
Name: | awr_RegulatoryAssetNotAccruingCarryingCosts
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the recovery periods of the surcharge billed to the customers. + References No definition available. + Details
Name: | awr_RegulatoryAssetRecoveryPeriods
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | awr_RegulatoryAssetsAndLiabilitiesLineItems
Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Return on Equity Percentage + References No definition available. + Details
Name: | awr_ReturnonEquityPercentage
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage of proposed authorized ROE under the settlement agreement. + References No definition available. + Details
Name: | awr_SettlementAgreementProposedAuthorizedReturnOnEquityPercentage
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the weighted cost of capital (return on rate base), with an updated embedded debt cost and the settlement ROE. + References No definition available. + Details
Name: | awr_WeightedCostOfCapitalPercent
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInOtherRegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_NetRegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_PensionCostsAndOtherPostretirementBenefitCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_GainLossOnDerivativeInstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_CostOfCapitalProceedingForWaterRegionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=us-gaap_RevenueSubjectToRefundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_CostsDeferredForFutureRecoveryOnAerojetCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_LowIncomeRateAssistanceBalancingAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_GeneralRateCaseMemorandumAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_OtherRegulatoryAssetsNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_DeferredIncomeTaxChargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_FlowThroughTaxesNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_RevenueSubjecttoRefundforTCJAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_WaterRevenueAdjustmentMechanismMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_ModifiedCostBalancingAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=awr_RevenueSubjecttoRefundforTCJAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_PendingGeneralRateCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |