XML 36 R23.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Regulatory Matters: (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2012 | Dec. 31, 2015 | Mar. 31, 2017 | Dec. 31, 2016
Regulatory matters: |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  | $ 58,000 |
Weighted Cost of Capital Percent |  |  | 8.34% |
Settlement Agreement Proposed Authorized Return on Equity Percentage |  |  | 9.43% |
Pension and other post-retirement obligations |  |  |  |
Regulatory matters: |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  | $ 26,600 |
Flow-through taxes, net |  |  |  |
Regulatory matters: |  |  |  |
Regulatory assets |  |  | 20,708 |
Regulatory Asset Not Accruing Carrying Costs |  |  | 20,700 |
GOLDEN STATE WATER COMPANY |  |  |  |
Regulatory matters: |  |  |  |
Regulatory assets |  |  | 155,987 | $ 146,281
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |  |
Regulatory matters: |  |  |  |
Regulatory assets |  |  | 55,298 | 47,340
annual surcharges as percentage of last authorized revenue requirement | 10.00% |  |  |
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case |  |  |  |
Regulatory matters: |  |  |  |
Regulatory assets |  |  | 11,705 | 11,820
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations |  |  |  |
Regulatory matters: |  |  |  |
Regulatory assets |  |  | 27,452 | 28,118
GOLDEN STATE WATER COMPANY | Derivative unrealized loss |  |  |  |
Regulatory matters: |  |  |  |
Regulatory assets |  |  | 5,460 | 4,901
GOLDEN STATE WATER COMPANY | Flow-through taxes, net |  |  |  |
Regulatory matters: |  |  |  |
Regulatory assets |  |  |  | 20,134
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts |  |  |  |
Regulatory matters: |  |  |  |
Regulatory assets |  |  | 8,502 | 8,272
GOLDEN STATE WATER COMPANY | General Rate Case Memorandum Accounts [Member] |  |  |  |
Regulatory matters: |  |  |  |
Regulatory assets |  |  | 14,689 | 13,929
GOLDEN STATE WATER COMPANY | Other regulatory assets |  |  |  |
Regulatory matters: |  |  |  |
Regulatory assets |  |  | $ 17,477 | 17,633
GOLDEN STATE WATER COMPANY | Cost of Capital, Proceeding for Water Regions [Member] |  |  |  |
Regulatory matters: |  |  |  |
Weighted Cost of Capital Percent |  |  | 9.11% |
Cost Of Debt Percent |  |  | 6.60% |
Return on Equity Percentage |  |  | 11.00% |
Water Service Utility Operations [Member] | General Rate Case Memorandum Accounts [Member] |  |  |  |
Regulatory matters: |  |  |  |
Regulatory assets |  |  | $ 10,200 |
Various refunds to customers | GOLDEN STATE WATER COMPANY |  |  |  |
Regulatory matters: |  |  |  |
Regulatory assets |  |  | $ (5,304) | $ (5,866)
Maximum [Member] | GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |  |  |
Regulatory matters: |  |  |  |
Regulatory Asset Recovery Periods |  | 24 months |  |

X
- Definition annual surcharges as percentage of last authorized revenue requirement + References No definition available. + Details
Name: | awr_Annualsurchargesaspercentageoflastauthorizedrevenuerequirement
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cost Of Debt Percent + References No definition available. + Details
Name: | awr_CostOfDebtPercent
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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 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_PensionCostsAndOtherPostretirementBenefitCostsMember
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: | dei_LegalEntityAxis=awr_GoldenStateWaterCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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