XML 60 R44.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Regulatory Matters (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2005 | Jul. 31, 2005 | Dec. 31, 2016 | Dec. 31, 2015
Regulatory matters: |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  | $ 56,900 |
Pension Costs and Other Postretirement Benefit Costs |  |  |  |
Regulatory matters: |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  | 26,800 |
General Rate Case Memorandum Accounts [Member] |  |  |  |
Regulatory matters: |  |  |  |
Total |  |  | 9,500 |
GSWC |  |  |  |
Regulatory matters: |  |  |  |
Total |  |  | 146,281 | $ 132,696
GSWC | Various refunds to customers |  |  |  |
Regulatory matters: |  |  |  |
Total |  |  | (5,866) | (4,766)
GSWC | WRAM, net of MCBA |  |  |  |
Regulatory matters: |  |  |  |
Total |  |  | 47,340 | 45,171
GSWC | Costs deferred for future recovery on Aerojet case |  |  |  |
Regulatory matters: |  |  |  |
Total |  |  | 11,820 | 12,699
Regulatory Asset Recovery Periods |  | 20 years |  |
GSWC | Pension Costs and Other Postretirement Benefit Costs |  |  |  |
Regulatory matters: |  |  |  |
Total |  |  | 28,118 | 21,996
GSWC | Gain (Loss) on Derivative Instruments [Member] |  |  |  |
Regulatory matters: |  |  |  |
Total |  |  | 4,901 | 7,053
GSWC | Flow-through taxes, net |  |  |  |
Regulatory matters: |  |  |  |
Total |  |  | 20,134 | 16,176
GSWC | Low income rate assistance balancing accounts |  |  |  |
Regulatory matters: |  |  |  |
Total |  |  | 8,272 | 8,699
GSWC | Other regulatory assets, net |  |  |  |
Regulatory matters: |  |  |  |
Total |  |  | 17,633 | 21,235
GSWC | General Rate Case Memorandum Accounts [Member] |  |  |  |
Regulatory matters: |  |  |  |
Total |  |  | $ 13,929 | $ 4,433
Minimum [Member] | General Rate Case Memorandum Accounts [Member] |  |  |  |
Regulatory matters: |  |  |  |
Regulatory Asset Recovery Periods |  |  | 12 months |
Minimum [Member] | GSWC | General Rate Case Memorandum Accounts [Member] |  |  |  |
Regulatory matters: |  |  |  |
Regulatory Asset Recovery Periods |  |  | 12 months |
Maximum [Member] | General Rate Case Memorandum Accounts [Member] |  |  |  |
Regulatory matters: |  |  |  |
Regulatory Asset Recovery Periods |  |  | 24 months |
Maximum [Member] | GSWC | Costs deferred for future recovery on Aerojet case |  |  |  |
Regulatory matters: |  |  |  |
Regulatory Asset Recovery Periods | 20 years |  |  |
Maximum [Member] | GSWC | General Rate Case Memorandum Accounts [Member] |  |  |  |
Regulatory matters: |  |  |  |
Regulatory Asset Recovery Periods |  |  | 24 months |

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 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_GeneralRateCaseMemorandumAccountsMember
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_RegulatoryLiabilityAxis=us-gaap_RevenueSubjectToRefundMember
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_FlowThroughTaxesNetMember
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_OtherRegulatoryAssetsNetMember
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: |

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