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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Defined contribution plan  
Employer contribution to the plan $ 1.9us-gaap_DefinedContributionPlanCostRecognized
Pension Plan  
Employee benefit plans  
Minimum age for eligibility under the Pension Plan 21awr_DefinedBenefitPlanMinimumAgeForEligibility
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Minimum period of service for eligibility under the Pension Plan 5 years
Normal retirement benefit (as a percent) 2.00%awr_DefinedBenefitPlanRetirementBenefitPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Number of highest consecutive years' average earnings used in computing retirement benefit 5 years
Maximum number of years of credited service considered in determining retirement benefit 40 years
Number of participants in the Pension Plan 977awr_DefinedBenefitPlanNumberofEmployeesCovered
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Pension Plan  
Defined contribution plan  
Percentage of participant's eligible pay contributed to the plan by the employer 5.25%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_PensionPlansDefinedBenefitMember
Eligibility for employer matching contributions, period of service 3 years