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Earnings per Share/Capital Stock: (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 27, 2014
Additional disclosure      
Options outstanding (in shares) 198,764us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 247,064us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Stock options not included in the calculation of diluted EPS (in shares) 0awr_ShareBasedCompensationArrangementbyShareBasedPaymentAwardOptionsOutstandingNotIncludedinCalculationofDilutedEarningsPerShareNumber    
Anti-dilutive stock options not included in the computation of diluted EPS (in shares) 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
Common Shares issued under DRP and the 2000 and 2008 Employee Plans 47,422us-gaap_StockIssuedDuringPeriodSharesNewIssues 57,249us-gaap_StockIssuedDuringPeriodSharesNewIssues  
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans $ 292us-gaap_StockIssuedDuringPeriodValueNewIssues $ 201us-gaap_StockIssuedDuringPeriodValueNewIssues  
Dividends paid $ 8,155us-gaap_PaymentsOfDividends $ 7,846us-gaap_PaymentsOfDividends  
Quarterly dividends paid, per share of common stock (in dollars per share) $ 0.2130us-gaap_CommonStockDividendsPerShareCashPaid $ 0.2025us-gaap_CommonStockDividendsPerShareCashPaid  
Restricted Stock Units      
Additional disclosure      
Restricted stock units outstanding (in shares) 226,319us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
237,174us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
AWR      
Additional disclosure      
Authorized shares to be repurchased     1,250,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
AWR      
Additional disclosure      
Common Shares repurchased in the open market under DRP and 401(k) Plan 356,769us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= us-gaap_ParentCompanyMember