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v2.4.1.9

Long-Term Debt (Details 3) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 23, 2014 | Mar. 31, 2014 | Oct. 31, 2009
Long-term debt |  |  |  |  |  |
Loan proceeds received for reimbursement of costs of conversion | $ 14,846,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt | $ 60,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt | $ 3,408,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt |  |  |
Notes Payable 3.45 Percent Due 2029 [Member] |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Interest rate (as a percent) | 3.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable3.45PercentDue2029Member | 3.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable3.45PercentDue2029Member |  |  |  |
GSWC |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Ratio of Indebtedness to EBITDA | 2.3695 awr_RatioofIndebtednesstoEBITDA / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |  |  |  |
Loan proceeds received for reimbursement of costs of conversion | 14,846,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 60,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 3,408,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |  |
GSWC | Maximum |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Ratio of Indebtedness to EBITDA | 8.0000 awr_RatioofIndebtednesstoEBITDA / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
GSWC | Private Placement Notes [Member] |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt Instrument Covenant Interest Coverage Ratio | 400.00%awr_DebtInstrumentCovenantInterestCoverageRatio / us-gaap_CreditFacilityAxis = awr_PrivatePlacementNotesMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |  |  |  |
GSWC | Private Placement Notes [Member] | Minimum [Member] |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt Instrument Covenant Interest Coverage Ratio | 200.00%awr_DebtInstrumentCovenantInterestCoverageRatio / us-gaap_CreditFacilityAxis = awr_PrivatePlacementNotesMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
GSWC | Notes Payable 3.45 Percent Due 2029 [Member] |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 15,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable3.45PercentDue2029Member |  |
Interest rate (as a percent) | 3.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable3.45PercentDue2029Member | 3.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable3.45PercentDue2029Member |  |  | 3.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable3.45PercentDue2029Member |
GSWC | American Recovery and Reinvestment Act Obligation due 2033 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Maximum amount of loan that can be borrowed |  |  |  |  |  | 9,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_AmericanRecoveryAndReinvestmentActObligationDue2033Member
Interest rate (as a percent) | 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_AmericanRecoveryAndReinvestmentActObligationDue2033Member |  |  |  |  |
Maturity term | 20 years |  |  |  |  |
Loan proceeds received for reimbursement of costs of conversion | 8,600,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_AmericanRecoveryAndReinvestmentActObligationDue2033Member |  |  |  |  |
GSWC | American Recovery and Reinvestment Act Obligation due 2033 | Letters of credit to CDHP |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Letters of credit issued, percentage of maximum available under facility | 80.00%awr_DebtInstrumentLetterOfCreditIssuedMaximumBorrowingCapacityPercentage / us-gaap_CreditFacilityAxis = awr_LetterOfCreditIssuedToCaliforniaDepartmentOfHealthMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_AmericanRecoveryAndReinvestmentActObligationDue2033Member |  |  |  |  |
Amount of debt issued | $ 6,700,000.0 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = awr_LetterOfCreditIssuedToCaliforniaDepartmentOfHealthMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_AmericanRecoveryAndReinvestmentActObligationDue2033Member |  |  |  |  |

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