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Regulatory Matters: (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Regulatory matters: |  |
Regulatory asset not accruing carrying costs | $ 68,600,000 awr_RegulatoryAssetNotAccruingCarryingCosts |
Other Liabilities, Current | 17,711,000 us-gaap_OtherLiabilitiesCurrent | 18,760,000 us-gaap_OtherLiabilitiesCurrent
Pension and other post-retirement obligations |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 40,200,000 awr_RegulatoryAssetNotAccruingCarryingCosts / us-gaap_RegulatoryAssetAxis = awr_PensionCostsAndOtherPostretirementBenefitCostsMember |
Derivative unrealized loss |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 6,200,000 awr_RegulatoryAssetNotAccruingCarryingCosts / us-gaap_RegulatoryAssetAxis = us-gaap_GainLossOnDerivativeInstrumentsMember |
Flow-through taxes, net |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | 17,100,000 awr_RegulatoryAssetNotAccruingCarryingCosts / us-gaap_RegulatoryAssetAxis = awr_FlowThroughTaxesNetMember |
Other regulatory assets |  |
Regulatory matters: |  |
Other Liabilities, Current | 4,300,000 us-gaap_OtherLiabilitiesCurrent / us-gaap_RegulatoryAssetAxis = awr_OtherRegulatoryAssetsNetMember |
GOLDEN STATE WATER COMPANY |  |
Regulatory matters: |  |
Regulatory assets | 131,921,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 125,704,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Other Liabilities, Current | 17,420,000 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 18,659,000 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
GOLDEN STATE WATER COMPANY | Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account |  |
Regulatory matters: |  |
Regulatory assets | 17,948,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember | 9,369,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember
GOLDEN STATE WATER COMPANY | Base Revenue Requirement Adjustment Mechanism |  |
Regulatory matters: |  |
Regulatory assets | 6,452,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_BaseRevenueRequirementAdjustmentMechanismMember | 7,761,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_BaseRevenueRequirementAdjustmentMechanismMember
GOLDEN STATE WATER COMPANY | Costs deferred for future recovery on Aerojet case |  |
Regulatory matters: |  |
Regulatory assets | 13,457,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_CostsDeferredForFutureRecoveryOnAerojetCaseMember | 13,629,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_CostsDeferredForFutureRecoveryOnAerojetCaseMember
GOLDEN STATE WATER COMPANY | Pension and other post-retirement obligations |  |
Regulatory matters: |  |
Regulatory assets | 42,884,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_PensionCostsAndOtherPostretirementBenefitCostsMember | 43,426,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_PensionCostsAndOtherPostretirementBenefitCostsMember
GOLDEN STATE WATER COMPANY | Derivative unrealized loss |  |
Regulatory matters: |  |
Regulatory assets | 6,176,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = us-gaap_GainLossOnDerivativeInstrumentsMember | 3,339,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = us-gaap_GainLossOnDerivativeInstrumentsMember
GOLDEN STATE WATER COMPANY | Flow-through taxes, net |  |
Regulatory matters: |  |
Regulatory assets | 17,092,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_FlowThroughTaxesNetMember | 17,612,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_FlowThroughTaxesNetMember
GOLDEN STATE WATER COMPANY | Low income rate assistance balancing accounts |  |
Regulatory matters: |  |
Regulatory assets | 9,215,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_LowIncomeRateAssistanceBalancingAccountsMember | 9,109,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_LowIncomeRateAssistanceBalancingAccountsMember
GOLDEN STATE WATER COMPANY | General rate case memorandum accounts |  |
Regulatory matters: |  |
Regulatory assets | 4,651,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_GeneralRateCaseMemorandumAccountsMember | 4,731,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_GeneralRateCaseMemorandumAccountsMember
GOLDEN STATE WATER COMPANY | Other regulatory assets |  |
Regulatory matters: |  |
Regulatory assets | 14,686,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_OtherRegulatoryAssetsNetMember | 17,487,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_OtherRegulatoryAssetsNetMember
Various refunds to customers | GOLDEN STATE WATER COMPANY |  |
Regulatory matters: |  |
Regulatory assets | $ (640,000)us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryLiabilityAxis = us-gaap_RevenueSubjectToRefundMember | $ (759,000)us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryLiabilityAxis = us-gaap_RevenueSubjectToRefundMember

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- 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
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