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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT (Details 2) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed financial statements |  |  |
Income from operations before income tax expense | $ 99,106,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 98,469,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 90,093,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net Income | 61,058,000 us-gaap_NetIncomeLoss | 62,686,000 us-gaap_NetIncomeLoss | 54,148,000 us-gaap_NetIncomeLoss
Weighted Average Number of Shares Outstanding (in shares) | 38,658 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 38,639 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 37,998 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic Earnings Per Common Share (in dollars per share) | $ 1.57 us-gaap_EarningsPerShareBasic | $ 1.61 us-gaap_EarningsPerShareBasic | $ 1.42 us-gaap_EarningsPerShareBasic
Weighted Average Number of Diluted Common Shares Outstanding | 38,880 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 38,869 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 38,262 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Fully Diluted Earnings per Common Share (in dollars per share) | $ 1.57 us-gaap_EarningsPerShareDiluted | $ 1.61 us-gaap_EarningsPerShareDiluted | $ 1.41 us-gaap_EarningsPerShareDiluted
AWR |  |  |
Condensed financial statements |  |  |
Maximum borrowing capacity on line of credit | 100,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Operating revenues and other income | 81,000 awr_SalesRevenueNetAndOtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 227,000 awr_SalesRevenueNetAndOtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 64,000 awr_SalesRevenueNetAndOtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating Expenses and Other Expenses | 48,000 awr_OperatingExpensesandOtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,000 awr_OperatingExpensesandOtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 120,000 awr_OperatingExpensesandOtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating income / (loss) | 33,000 awr_OperatingIncomeLossIncludingOtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 219,000 awr_OperatingIncomeLossIncludingOtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (56,000)awr_OperatingIncomeLossIncludingOtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in earnings of subsidiaries | 60,029,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 60,205,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 54,212,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income from operations before income tax expense | 60,062,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 60,424,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 54,156,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax expense (benefit) | (996,000)awr_IncomeTaxExpensesBenefits / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,262,000)awr_IncomeTaxExpensesBenefits / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,000 awr_IncomeTaxExpensesBenefits / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Income | 61,058,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 62,686,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 54,148,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Promissory note | AWR |  |  |
Condensed financial statements |  |  |
Maximum borrowing capacity on debt instrument | 20,000,000 awr_DebtInstrumentMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |
Notes Receivable | Promissory note | AWR |  |  |
Condensed financial statements |  |  |
Balance outstanding | $ 0 us-gaap_NotesReceivableRelatedPartiesCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_NotesReceivableMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |

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