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Military Privatization (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Military Privatization |  |  |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | $ 11,736 us-gaap_BillingsInExcessOfCostCurrent | $ 6,852 us-gaap_BillingsInExcessOfCostCurrent |  |
Receivables from the U.S. government: |  |  |  |
Less: allowance for doubtful accounts | (892)us-gaap_AllowanceForDoubtfulAccountsReceivable | (1,187)us-gaap_AllowanceForDoubtfulAccountsReceivable | (1,228)us-gaap_AllowanceForDoubtfulAccountsReceivable | (1,048)us-gaap_AllowanceForDoubtfulAccountsReceivable
Pretax income |  |  |  |
Increase in pretax operating income | 119,045 us-gaap_OperatingIncomeLoss | 119,072 us-gaap_OperatingIncomeLoss | 111,094 us-gaap_OperatingIncomeLoss |
Military Utility Privatization Subsidiaries |  |  |  |
Military Privatization |  |  |  |
Period of fixed price contracts to maintain water systems at various military bases | 50 years |  |  |
Initial contract period | 2 years |  |  |
Price redetermination interval | 3 years |  |  |
Revenues recognized net of billings to date |  |  |  |
Revenues (costs and estimated earnings) recognized on uncompleted contracts | 91,141 us-gaap_GovernmentContractReceivableUnbilledAmounts / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember | 78,741 us-gaap_GovernmentContractReceivableUnbilledAmounts / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |  |
Less: Billings to date | (56,114)us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember | (32,262)us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |  |
Total | 35,027 us-gaap_UnbilledReceivablesNotBillableAtBalanceSheetDate / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember | 46,479 us-gaap_UnbilledReceivablesNotBillableAtBalanceSheetDate / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |  |
Amount included in accompanying balance sheets |  |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 46,763 us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember | 53,331 us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | (11,736)us-gaap_BillingsInExcessOfCost / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember | (6,852)us-gaap_BillingsInExcessOfCost / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |  |
Total | 35,027 us-gaap_UnbilledReceivablesNotBillableAtBalanceSheetDate / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember | 46,479 us-gaap_UnbilledReceivablesNotBillableAtBalanceSheetDate / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |  |
Receivables from the U.S. government: |  |  |  |
Billed receivables from the U.S. government | 6,709 us-gaap_BilledContractReceivables / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember | 7,106 us-gaap_BilledContractReceivables / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |  |
Unbilled Contract Receivables, Current | 3,689 awr_UnbilledContractReceivablesCurrent / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember | 0 awr_UnbilledContractReceivablesCurrent / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |  |
Unbilled Contract Receivables, Non-current | 3,513 awr_UnbilledContractReceivablesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember | 3,104 awr_UnbilledContractReceivablesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |  |
Less: allowance for doubtful accounts | 0 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember | 0 us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |  |
Pretax income |  |  |  |
Government Contract Receivable | 13,911 us-gaap_GovernmentContractReceivable / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember | 10,210 us-gaap_GovernmentContractReceivable / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |  |
American States Utility Services [Member] | Military Utility Privatization Subsidiaries |  |  |  |
Pretax income |  |  |  |
Increase in pretax operating income | 19,351 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = awr_AmericanStatesUtilityServicesMember / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember | 16,737 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = awr_AmericanStatesUtilityServicesMember / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember | 24,608 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = awr_AmericanStatesUtilityServicesMember / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |
Reportable Legal Entities [Member] | American States Utility Services [Member] | Military Utility Privatization Subsidiaries |  |  |  |
Military Privatization |  |  |  |
Revenue Recognition, Retrospective Rate-Setting Systems, Amount | 1,700 awr_RevenueRecognitionRetrospectiveRateSettingSystemsAmount / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = awr_AmericanStatesUtilityServicesMember / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |  |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | $ 6,100 us-gaap_BillingsInExcessOfCostCurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableLegalEntitiesMember / dei_LegalEntityAxis = awr_AmericanStatesUtilityServicesMember / us-gaap_StatementBusinessSegmentsAxis = awr_ContractedServicesMember |  |  |

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