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CONSOLIDATED STATEMENTS OF CAPITALIZATION (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Common Shareholders' Equity:
Common shares, no par value	$ 253,199us-gaap_CommonStockValue	$ 253,961us-gaap_CommonStockValue
Earnings reinvested in the business	253,602us-gaap_RetainedEarningsAccumulatedDeficit	238,443us-gaap_RetainedEarningsAccumulatedDeficit
Common shareholders' equity	506,801us-gaap_StockholdersEquity	492,404us-gaap_StockholdersEquity
Long-Term Debt
Total	326,090us-gaap_DebtAndCapitalLeaseObligations	332,377us-gaap_DebtAndCapitalLeaseObligations
Less: Current maturities	(292)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent	(6,298)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-Term Debt	325,798us-gaap_LongTermDebtAndCapitalLeaseObligations	326,079us-gaap_LongTermDebtAndCapitalLeaseObligations
Total capitalization	832,599us-gaap_CapitalizationLongtermDebtAndEquity	818,483us-gaap_CapitalizationLongtermDebtAndEquity
GSWC
Common Shareholders' Equity:
Common shares, no par value	235,607us-gaap_CommonStockValue / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	233,721us-gaap_CommonStockValue / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Earnings reinvested in the business	199,583us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	203,892us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Common shareholders' equity	435,190us-gaap_StockholdersEquity / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	437,613us-gaap_StockholdersEquity / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Long-Term Debt
Total	326,090us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	332,377us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Less: Current maturities	(292)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	(6,298)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Long-Term Debt	325,798us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	326,079us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Total capitalization	760,988us-gaap_CapitalizationLongtermDebtAndEquity / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	763,692us-gaap_CapitalizationLongtermDebtAndEquity / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
6.87% notes due 2023
Long-Term Debt
Total	0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.87PercentDue2023Member	5,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.87PercentDue2023Member
6.87% notes due 2023 | GSWC
Long-Term Debt
Total	0us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.87PercentDue2023Member	5,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.87PercentDue2023Member
7.00% notes due 2023
Long-Term Debt
Total	0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable7PercentDue2023Member	10,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable7PercentDue2023Member
7.00% notes due 2023 | GSWC
Long-Term Debt
Total	0us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable7PercentDue2023Member	10,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable7PercentDue2023Member
6.81% notes due 2028
Long-Term Debt
Total	15,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.81PercentDue2028Member	15,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.81PercentDue2028Member
6.81% notes due 2028 | GSWC
Long-Term Debt
Total	15,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.81PercentDue2028Member	15,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.81PercentDue2028Member
6.59% notes due 2029
Long-Term Debt
Total	40,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.59PercentDue2029Member	40,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.59PercentDue2029Member
6.59% notes due 2029 | GSWC
Long-Term Debt
Total	40,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.59PercentDue2029Member	40,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.59PercentDue2029Member
7.875% notes due 2030
Long-Term Debt
Total	20,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable7.875PercentDue2030Member	20,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable7.875PercentDue2030Member
7.875% notes due 2030 | GSWC
Long-Term Debt
Total	20,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable7.875PercentDue2030Member	20,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable7.875PercentDue2030Member
7.23% notes due 2031
Long-Term Debt
Total	50,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable7.23PercentDue2031Member	50,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable7.23PercentDue2031Member
7.23% notes due 2031 | GSWC
Long-Term Debt
Total	50,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable7.23PercentDue2031Member	50,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable7.23PercentDue2031Member
6.00% notes due 2041
Long-Term Debt
Total	62,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6PercentDue2041Member	62,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6PercentDue2041Member
6.00% notes due 2041 | GSWC
Long-Term Debt
Total	62,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6PercentDue2041Member	62,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6PercentDue2041Member
3.45% private placement notes due 2029
Long-Term Debt
Total	15,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable3.45PercentDue2029Member	0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable3.45PercentDue2029Member
3.45% private placement notes due 2029 | GSWC
Long-Term Debt
Total	15,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable3.45PercentDue2029Member	0us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable3.45PercentDue2029Member
9.56% private placement notes due 2031
Long-Term Debt
Total	28,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable9.56PercentDue2031Member	28,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable9.56PercentDue2031Member
9.56% private placement notes due 2031 | GSWC
Long-Term Debt
Total	28,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable9.56PercentDue2031Member	28,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable9.56PercentDue2031Member
5.87% private placement notes due 2028
Long-Term Debt
Total	40,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable5.87PercentDue2028Member	40,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable5.87PercentDue2028Member
5.87% private placement notes due 2028 | GSWC
Long-Term Debt
Total	40,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable5.87PercentDue2028Member	40,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable5.87PercentDue2028Member
6.70% private placement notes due 2019
Long-Term Debt
Total	40,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.7PercentDue2019Member	40,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.7PercentDue2019Member
6.70% private placement notes due 2019 | GSWC
Long-Term Debt
Total	40,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.7PercentDue2019Member	40,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable6.7PercentDue2019Member
5.50% tax-exempt obligation due 2026
Long-Term Debt
Total	7,730us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable5.5PercentDue2026Member	7,730us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable5.5PercentDue2026Member
5.50% tax-exempt obligation due 2026 | GSWC
Long-Term Debt
Total	7,730us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable5.5PercentDue2026Member	7,730us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_NotesPayable5.5PercentDue2026Member
Tax-Exempt Variable Rate Obligation due 2014
Long-Term Debt
Total	0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_VariableRateObligationDue2014Member	6,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_VariableRateObligationDue2014Member
Tax-Exempt Variable Rate Obligation due 2014 | GSWC
Long-Term Debt
Total	0us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_VariableRateObligationDue2014Member	6,000us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_VariableRateObligationDue2014Member
Tax-Exempt State Water Project due 2035
Long-Term Debt
Total	4,077us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_StateWaterProjectDue2035Member	4,190us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_StateWaterProjectDue2035Member
Tax-Exempt State Water Project due 2035 | GSWC
Long-Term Debt
Total	4,077us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_StateWaterProjectDue2035Member	4,190us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_StateWaterProjectDue2035Member
Variable Rate Obligation due 2018
Long-Term Debt
Total	125us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_VariableRateObligationDue2018Member	161us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_VariableRateObligationDue2018Member
Variable Rate Obligation due 2018 | GSWC
Long-Term Debt
Total	125us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_VariableRateObligationDue2018Member	161us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_VariableRateObligationDue2018Member
American Recovery and Reinvestment Act Obligation due 2033
Long-Term Debt
Total	4,158us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_AmericanRecoveryAndReinvestmentActObligationDue2033Member	4,269us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = awr_AmericanRecoveryAndReinvestmentActObligationDue2033Member
American Recovery and Reinvestment Act Obligation due 2033 | GSWC
Long-Term Debt
Total	4,158us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_AmericanRecoveryAndReinvestmentActObligationDue2033Member	4,269us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_AmericanRecoveryAndReinvestmentActObligationDue2033Member
Capital lease obligations
Long-Term Debt
Total	0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember	27us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember
Capital lease obligations | GSWC
Long-Term Debt
Total	$ 0us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember	$ 27us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember

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