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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) | 198,764 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 247,064 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
Stock options not included in the calculation of diluted EPS (in shares) | 0 awr_ShareBasedCompensationArrangementbyShareBasedPaymentAwardOptionsOutstandingNotIncludedinCalculationofDilutedEarningsPerShareNumber |  |
Anti-dilutive stock options not included in the computation of diluted EPS (in shares) | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |
Common Shares issued under DRP and the 2000 and 2008 Employee Plans | 47,422 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 57,249 us-gaap_StockIssuedDuringPeriodSharesNewIssues |
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans | $ 292 us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 201 us-gaap_StockIssuedDuringPeriodValueNewIssues |
Dividends paid | $ 8,155 us-gaap_PaymentsOfDividends | $ 7,846 us-gaap_PaymentsOfDividends |
Quarterly dividends paid, per share of common stock (in dollars per share) | $ 0.2130 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.2025 us-gaap_CommonStockDividendsPerShareCashPaid |
Restricted Stock Units |  |  |
Additional disclosure |  |  |
Restricted stock units outstanding (in shares) | 226,319 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 237,174 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
AWR |  |  |
Additional disclosure |  |  |
Authorized shares to be repurchased |  |  | 1,250,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
AWR |  |  |
Additional disclosure |  |  |
Common Shares repurchased in the open market under DRP and 401(k) Plan | 356,769 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = us-gaap_ParentCompanyMember |  |

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