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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 $ 61,058us-gaap_NetIncomeLoss $ 62,686us-gaap_NetIncomeLoss $ 54,148us-gaap_NetIncomeLoss
Less: Distributed earnings to common shareholders 32,125awr_WeightedAverageDividendsCommonStock 29,366awr_WeightedAverageDividendsCommonStock 24,129awr_WeightedAverageDividendsCommonStock
Less: Distributed earnings to participating securities 177us-gaap_PreferredStockDividendsAndOtherAdjustments 171us-gaap_PreferredStockDividendsAndOtherAdjustments 171us-gaap_PreferredStockDividendsAndOtherAdjustments
Undistributed earnings 28,756us-gaap_UndistributedEarnings 33,149us-gaap_UndistributedEarnings 29,848us-gaap_UndistributedEarnings
Undistributed earnings allocated to common shareholders 28,599awr_UndistributedEarningsAllocatedToCommonStock 32,958awr_UndistributedEarningsAllocatedToCommonStock 29,638awr_UndistributedEarningsAllocatedToCommonStock
Undistributed earnings allocated to participating securities   191us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic 210us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Total income available to common shareholders, basic 60,724us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 62,324us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 53,767us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average Common Shares outstanding, basic 38,658,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 38,639,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 37,998,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per Common Share:      
Income from continuing operations (in dollars per share) $ 1.57us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.61us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.42us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Net Income (in dollars per share) $ 1.57us-gaap_EarningsPerShareBasic $ 1.61us-gaap_EarningsPerShareBasic $ 1.42us-gaap_EarningsPerShareBasic
Diluted      
Total income available to common shareholders, basic 60,724us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 62,324us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 53,767us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Undistributed earnings for dilutive stock options 157us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted 191us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted 210us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted
Total common shareholders earnings, diluted $ 60,881us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 62,515us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 53,977us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average Common Shares outstanding, basic 38,658,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 38,639,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 37,998,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Stock-based compensation (in shares) 222,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements [1] 230,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements [1] 264,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements [1]
Weighted average common shares outstanding, diluted 38,880,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 38,869,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 38,262,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per Common Share:      
Income from continuing operations (in dollars per share) $ 1.57us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.61us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.41us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Net Income (in dollars per share) $ 1.57us-gaap_EarningsPerShareDiluted $ 1.61us-gaap_EarningsPerShareDiluted $ 1.41us-gaap_EarningsPerShareDiluted
Stock option and restricted stock option outstanding      
Options outstanding (in shares) 222,580us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber    
Restricted Stock Units      
Share based compensation arrangement      
Restricted stock units outstanding (in shares) 221,302us-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.