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Earnings Per Share and Capital Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Basic |  |  |  |  |  |
Net Income | $ 61,058 us-gaap_NetIncomeLoss |  | $ 62,686 us-gaap_NetIncomeLoss |  | $ 54,148 us-gaap_NetIncomeLoss |
Less: Distributed earnings to common shareholders | 32,125 awr_WeightedAverageDividendsCommonStock |  | 29,366 awr_WeightedAverageDividendsCommonStock |  | 24,129 awr_WeightedAverageDividendsCommonStock |
Less: Distributed earnings to participating securities | 177 us-gaap_PreferredStockDividendsAndOtherAdjustments |  | 171 us-gaap_PreferredStockDividendsAndOtherAdjustments |  | 171 us-gaap_PreferredStockDividendsAndOtherAdjustments |
Undistributed earnings | 28,756 us-gaap_UndistributedEarnings |  | 33,149 us-gaap_UndistributedEarnings |  | 29,848 us-gaap_UndistributedEarnings |
Undistributed earnings allocated to common shareholders | 28,599 awr_UndistributedEarningsAllocatedToCommonStock |  | 32,958 awr_UndistributedEarningsAllocatedToCommonStock |  | 29,638 awr_UndistributedEarningsAllocatedToCommonStock |
Undistributed earnings allocated to participating securities |  |  | 191 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic |  | 210 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic |
Total income available to common shareholders, basic | 60,724 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 62,324 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 53,767 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Weighted average Common Shares outstanding, basic | 38,658,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 38,639,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 37,998,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Basic earnings per Common Share: |  |  |  |  |  |
Income from continuing operations (in dollars per share) | $ 1.57 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  | $ 1.61 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  | $ 1.42 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
Net Income (in dollars per share) | $ 1.57 us-gaap_EarningsPerShareBasic |  | $ 1.61 us-gaap_EarningsPerShareBasic |  | $ 1.42 us-gaap_EarningsPerShareBasic |
Diluted |  |  |  |  |  |
Total income available to common shareholders, basic | 60,724 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 62,324 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 53,767 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Undistributed earnings for dilutive stock options | 157 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted |  | 191 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted |  | 210 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted |
Total common shareholders earnings, diluted | $ 60,881 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | $ 62,515 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | $ 53,977 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |
Weighted average Common Shares outstanding, basic | 38,658,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 38,639,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 37,998,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Stock-based compensation (in shares) | 222,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | [1] | 230,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | [1] | 264,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | [1]
Weighted average common shares outstanding, diluted | 38,880,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 38,869,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 38,262,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Diluted earnings per Common Share: |  |  |  |  |  |
Income from continuing operations (in dollars per share) | $ 1.57 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ 1.61 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ 1.41 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |
Net Income (in dollars per share) | $ 1.57 us-gaap_EarningsPerShareDiluted |  | $ 1.61 us-gaap_EarningsPerShareDiluted |  | $ 1.41 us-gaap_EarningsPerShareDiluted |
Stock option and restricted stock option outstanding |  |  |  |  |  |
Options outstanding (in shares) | 222,580 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  |  |
Restricted Stock Units |  |  |  |  |  |
Share based compensation arrangement |  |  |  |  |  |
Restricted stock units outstanding (in shares) | 221,302 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = awr_RestrictedShareUnitIncludingPerformanceSharesMember |  |  |  |  |
[1] | (1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 222,580 stock options and 221,302 restricted stock units, including performance awards, at December 31, 2014 were deemed to be outstanding in accordance with accounting guidance on earnings per share.

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