$AWR
AMERICAN STATES WATER CO Stock $awr

$awr Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000105690320000018 Filed on February 24, 2020

Income Statement

Concept	2019 Q4	2019 Q1	2019
Revenue	$113.0M	$101.7M	$473.9M
YoY Change	1.79%	7.39%	8.48%
Cost Of Revenue	$22.40M	$18.40M	$55.67M
YoY Change	2.75%	-1.6%	3.28%
Gross Profit	$90.60M	$83.30M	$418.2M
YoY Change	1.57%	9.61%	9.22%
Gross Profit Margin	80.18%	81.88%	88.25%
Selling, General & Admin	$21.20M	$21.70M	$83.00M
YoY Change	3.41%	6.9%	0.48%
% of Gross Profit	23.4%	26.05%	19.85%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$9.000M	$10.83M	$35.40M
YoY Change	-15.89%	12.06%	-12.44%
% of Gross Profit	9.93%	13.0%	8.46%
Operating Expenses	$65.90M	$81.54M	$346.8M
YoY Change	-0.9%	7.23%	3.26%
Operating Profit	$24.72M	$20.20M	$127.1M
YoY Change	8.68%	8.05%	25.84%
Interest Expense	-$5.100M	$6.317M	$24.59M
YoY Change	37.84%	6.65%	4.92%
% of Operating Profit	-20.63%	31.28%	19.35%
Other Income/Expense, Net	$1.200M	-$4.033M	-$18.06M
YoY Change	-209.09%	-24.55%	-5.42%
Pretax Income	$20.80M	$16.16M	$109.0M
YoY Change	16.2%	21.1%	33.11%
Income Tax	$4.100M	$3.310M	$24.67M
% Of Pretax Income	19.71%	20.48%	22.63%
Net Earnings	$16.70M	$12.85M	$84.34M
YoY Change	21.11%	19.2%	32.05%
Net Earnings / Revenue	14.78%	12.63%	17.8%
Basic Earnings Per Share	$0.45	$0.35	$2.28
Diluted Earnings Per Share	$0.45	$0.35	$2.28
COMMON SHARES
Basic Shares Outstanding	36.84M shares	36.77M shares	36.81M shares
Diluted Shares Outstanding		36.95M shares	36.96M shares

Balance Sheet

Concept	2019 Q4	2019 Q1	2019
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.300M	$1.800M	$1.300M
YoY Change	-81.69%	-70.0%	-81.69%
Cash & Equivalents	$1.334M	$1.844M	$1.300M
Short-Term Investments
Other Short-Term Assets	$46.80M	$44.50M	$46.80M
YoY Change	1.3%	-34.17%	1.3%
Inventory	$6.400M	$5.900M	$6.400M
Prepaid Expenses
Receivables	$20.91M	$17.49M	$62.20M
Other Receivables	$5.700M	$100.0K	$5.700M
Total Short-Term Assets	$122.5M	$116.8M	$122.5M
YoY Change	-6.85%	-19.84%	-6.84%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.416B	$1.326B	$1.459B
YoY Change	9.21%	8.75%	10.4%
Goodwill	$1.116M	$1.116M
YoY Change	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$7.702M	$5.365M	$7.700M
YoY Change	44.72%	-6.01%	45.28%
Total Long-Term Assets	$1.519B	$1.409B	$1.519B
YoY Change	10.87%	10.28%	10.87%
TOTAL ASSETS
Total Short-Term Assets	$122.5M	$116.8M	$122.5M
Total Long-Term Assets	$1.519B	$1.409B	$1.519B
Total Assets	$1.641B	$1.526B	$1.641B
YoY Change	9.32%	7.2%	9.32%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$55.62M	$53.21M	$55.60M
YoY Change	-6.58%	37.15%	-6.55%
Accrued Expenses	$3.050M	$6.492M	$30.30M
YoY Change	-21.09%	-1.89%	26.78%
Deferred Revenue	$11.17M	$10.43M
YoY Change	48.3%	58.38%
Short-Term Debt	$5.000M	$0.00	$5.000M
YoY Change		-100.0%
Long-Term Debt Due	$344.0K	$326.0K	$300.0K
YoY Change	-99.15%	-99.19%	-99.26%
Total Short-Term Liabilities	$116.0M	$107.6M	$116.0M
YoY Change	-20.87%	-45.22%	-20.87%
LONG-TERM LIABILITIES
Long-Term Debt	$281.0M	$281.1M	$481.0M
YoY Change	-0.03%	0.01%	27.72%
Other Long-Term Liabilities	$13.93M	$10.95M	$317.5M
YoY Change	23.65%	-1.25%	3.83%
Total Long-Term Liabilities	$642.8M	$292.0M	$798.5M
YoY Change	24.69%	-0.04%	17.01%
TOTAL LIABILITIES
Total Short-Term Liabilities	$116.0M	$107.6M	$116.0M
Total Long-Term Liabilities	$642.8M	$292.0M	$798.5M
Total Liabilities	$758.8M	$399.6M	$1.040B
YoY Change	14.6%	-18.21%	10.24%
SHAREHOLDERS EQUITY
Retained Earnings	$346.0M	$0.00
YoY Change	13.6%	-100.0%
Common Stock	$255.6M	$254.3M
YoY Change	0.74%	1.58%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$601.5M	$561.5M	$601.5M
YoY Change
Total Liabilities & Shareholders Equity	$1.641B	$1.526B	$1.641B
YoY Change	9.32%	7.2%	9.32%

Cashflow Statement

Concept	2019 Q4	2019 Q1	2019
OPERATING ACTIVITIES
Net Income	$16.70M	$12.85M	$84.34M
YoY Change	21.11%	19.2%	32.05%
Depreciation, Depletion And Amortization	$9.000M	$10.83M	$35.40M
YoY Change	-15.89%	12.06%	-12.44%
Cash From Operating Activities	$32.60M	$29.38M	$116.9M
YoY Change	14.79%	-17.7%	-14.56%
INVESTING ACTIVITIES
Capital Expenditures	-$40.80M	$40.56M	$151.9M
YoY Change	3.82%	33.59%	20.05%
Acquisitions
YoY Change
Other Investing Activities	-$1.700M	-$213.0K	$1.424M
YoY Change	1600.0%	63.85%	-8.31%
Cash From Investing Activities	-$42.50M	-$40.35M	-$153.2M
YoY Change	8.42%	33.61%	19.64%
FINANCING ACTIVITIES
Cash Dividend Paid		$10.11M	$42.70M
YoY Change		8.02%	9.67%
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net		$40.09M	$40.33M
YoY Change		44940.45%	12269.63%
Cash From Financing Activities	900.0K	$5.672M	$30.52M
YoY Change	-94.41%	1790.67%	-1791.08%
NET CHANGE
Cash From Operating Activities	32.60M	$29.38M	$116.9M
Cash From Investing Activities	-42.50M	-$40.35M	-$153.2M
Cash From Financing Activities	900.0K	$5.672M	$30.52M
Net Change In Cash	-9.000M	-$5.297M	-$5.807M
YoY Change	-269.81%	-191.33%	-183.83%
FREE CASH FLOW
Cash From Operating Activities	$32.60M	$29.38M	$116.9M
Capital Expenditures	-$40.80M	$40.56M	$151.9M
Free Cash Flow	$73.40M	-$11.18M	-$35.08M
YoY Change	8.42%	-309.56%	-443.44%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2018	awr	Goodwill Acquired In Prior Period GoodwillAcquiredInPriorPeriod	1100000	USD
CY2017	awr	Proceedsfrom Stock Options Exercised Distributedto Subsidiaries ProceedsfromStockOptionsExercisedDistributedtoSubsidiaries	0	USD
CY2018	awr	Proceedsfrom Stock Options Exercised Distributedto Subsidiaries ProceedsfromStockOptionsExercisedDistributedtoSubsidiaries	0	USD
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0001056903
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	36680794	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	36846614	shares
CY2018	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0420
CY2017	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	USD
CY2018	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	USD
CY2016	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	2100000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	001-14431
CY2019	dei	Entity Registrant Name EntityRegistrantName	American States Water Company
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	95-4676679
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	CA
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	630 E. Foothill Boulevard,
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	San Dimas
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	91773-1212
CY2019	dei	City Area Code CityAreaCode	(909)
CY2019	dei	Local Phone Number LocalPhoneNumber	394-3600
CY2019	dei	Security12b Title Security12bTitle	American States Water Company Common Shares
CY2019	dei	Trading Symbol TradingSymbol	AWR
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019Q2	dei	Entity Public Float EntityPublicFloat	2771217000	USD
CY2020Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	36859505	shares
CY2019Q4	awr	Utilities Water Property Plant And Equipment Gross UtilitiesWaterPropertyPlantAndEquipmentGross	1700442000	USD
CY2018Q4	awr	Utilities Water Property Plant And Equipment Gross UtilitiesWaterPropertyPlantAndEquipmentGross	1649535000	USD
CY2019Q4	awr	Utilities Electric Property Plant And Equipment Gross UtilitiesElectricPropertyPlantAndEquipmentGross	108425000	USD
CY2018Q4	awr	Utilities Electric Property Plant And Equipment Gross UtilitiesElectricPropertyPlantAndEquipmentGross	106064000	USD
CY2019Q4	awr	Utilities Property Plant And Equipment Gross UtilitiesPropertyPlantAndEquipmentGross	1808867000	USD
CY2018Q4	awr	Utilities Property Plant And Equipment Gross UtilitiesPropertyPlantAndEquipmentGross	1755599000	USD
CY2019Q4	awr	Non Utilities Property Plant And Equipment Gross NonUtilitiesPropertyPlantAndEquipmentGross	30554000	USD
CY2018Q4	awr	Non Utilities Property Plant And Equipment Gross NonUtilitiesPropertyPlantAndEquipmentGross	24511000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1839421000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1780110000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	543263000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	561855000	USD
CY2019Q4	awr	Property Plant And Equipment Before Construction Work In Progress PropertyPlantAndEquipmentBeforeConstructionWorkInProgress	1296158000	USD
CY2018Q4	awr	Property Plant And Equipment Before Construction Work In Progress PropertyPlantAndEquipmentBeforeConstructionWorkInProgress	1218255000	USD
CY2019Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	119547000	USD
CY2018Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	78055000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1415705000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1296310000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1116000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	1116000	USD
CY2019Q4	awr	Property Plant And Equipment And Investments Other Net PropertyPlantAndEquipmentAndInvestmentsOtherNet	30293000	USD
CY2018Q4	awr	Property Plant And Equipment And Investments Other Net PropertyPlantAndEquipmentAndInvestmentsOtherNet	25356000	USD
CY2019Q4	awr	Property Plant And Equipment And Investments Other And Goodwill Net PropertyPlantAndEquipmentAndInvestmentsOtherAndGoodwillNet	31409000	USD
CY2018Q4	awr	Property Plant And Equipment And Investments Other And Goodwill Net PropertyPlantAndEquipmentAndInvestmentsOtherAndGoodwillNet	26472000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1334000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	7141000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	20907000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	23395000	USD
CY2019Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	20482000	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	40320000	USD
CY2018Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	23588000	USD
CY2019Q4	awr	Accounts Receivable From Us Government Net Current AccountsReceivableFromUSGovernmentNetCurrent	22613000	USD
CY2018Q4	awr	Accounts Receivable From Us Government Net Current AccountsReceivableFromUSGovernmentNetCurrent	21543000	USD
CY2019Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	3096000	USD
CY2018Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	3103000	USD
CY2019Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	5685000	USD
CY2018Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	2164000	USD
CY2019Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	6429000	USD
CY2018Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	5775000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	20930000	USD
CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	16527000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	5413000	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	6063000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Gross Current ContractWithCustomerAssetGrossCurrent	15567000	USD
CY2018Q4	us-gaap	Contract With Customer Asset Gross Current ContractWithCustomerAssetGrossCurrent	22169000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	122456000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	131468000	USD
CY2019Q4	us-gaap	Unbilled Receivables Not Billable At Balance Sheet Date UnbilledReceivablesNotBillableAtBalanceSheetDate	8621000	USD
CY2018Q4	us-gaap	Unbilled Receivables Not Billable At Balance Sheet Date UnbilledReceivablesNotBillableAtBalanceSheetDate	0	USD
CY2019Q4	awr	Account Receivablefrom Us Government Net Noncurrent AccountReceivablefromUSGovernmentNetNoncurrent	42206000	USD
CY2018Q4	awr	Account Receivablefrom Us Government Net Noncurrent AccountReceivablefromUSGovernmentNetNoncurrent	39583000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Gross Noncurrent ContractWithCustomerAssetGrossNoncurrent	64000	USD
CY2018Q4	us-gaap	Contract With Customer Asset Gross Noncurrent ContractWithCustomerAssetGrossNoncurrent	2278000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	13168000	USD
CY2018Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	0	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	7702000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	5322000	USD
CY2019Q4	awr	Regulatory And Other Assets RegulatoryAndOtherAssets	71761000	USD
CY2018Q4	awr	Regulatory And Other Assets RegulatoryAndOtherAssets	47183000	USD
CY2019Q4	us-gaap	Assets Assets	1641331000	USD
CY2018Q4	us-gaap	Assets Assets	1501433000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	601530000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	558223000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	280996000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	281087000	USD
CY2019Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	882526000	USD
CY2018Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	839310000	USD
CY2019Q4	us-gaap	Notes Payable To Bank Current NotesPayableToBankCurrent	5000000	USD
CY2018Q4	us-gaap	Notes Payable To Bank Current NotesPayableToBankCurrent	0	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	344000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	55616000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	59532000	USD
CY2019Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	95000	USD
CY2018Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	360000	USD
CY2019Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	11110000	USD
CY2018Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	10094000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	14255000	USD
CY2018Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	13842000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	3050000	USD
CY2018Q4	us-gaap	Interest Payable Current InterestPayableCurrent	3865000	USD
CY2019Q4	awr	Unrealizedlossonpurchasedpowercontracts Unrealizedlossonpurchasedpowercontracts	3171000	USD
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CY2019Q4	us-gaap	Billings In Excess Of Cost Current BillingsInExcessOfCostCurrent	11167000	USD
CY2018Q4	us-gaap	Billings In Excess Of Cost Current BillingsInExcessOfCostCurrent	7530000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1849000	USD
CY2018Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	0	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	10341000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	10731000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	115998000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	146585000	USD
CY2019Q4	us-gaap	Notes Payable To Bank Noncurrent NotesPayableToBankNoncurrent	200000000	USD
CY2018Q4	us-gaap	Notes Payable To Bank Noncurrent NotesPayableToBankNoncurrent	95500000	USD
CY2019Q4	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	63989000	USD
CY2018Q4	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	66305000	USD
CY2019Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	134706000	USD
CY2018Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	124385000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	125304000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	114216000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	23380000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	44867000	USD
CY2019Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	1295000	USD
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CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	68469000	USD
CY2018Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	57636000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	11739000	USD
CY2018Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	0	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	13925000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	11262000	USD
CY2019Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	642807000	USD
CY2018Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	515538000	USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1641331000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1501433000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	255566000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	253689000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	345964000	USD
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CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	601530000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	558223000	USD
CY2019Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	284699000	USD
CY2018Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	324978000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	344000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	40320000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	3359000	USD
CY2018Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	3571000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	280996000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	281087000	USD
CY2019Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	882526000	USD
CY2018Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	839310000	USD
CY2019	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	319830000	USD
CY2018	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	295258000	USD
CY2017	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	306332000	USD
CY2019	us-gaap	Regulated Operating Revenue Electric Non Nuclear RegulatedOperatingRevenueElectricNonNuclear	39548000	USD
CY2018	us-gaap	Regulated Operating Revenue Electric Non Nuclear RegulatedOperatingRevenueElectricNonNuclear	34350000	USD
CY2017	us-gaap	Regulated Operating Revenue Electric Non Nuclear RegulatedOperatingRevenueElectricNonNuclear	33969000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	114491000	USD
CY2018	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	107208000	USD
CY2017	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	100302000	USD
CY2019	us-gaap	Revenues Revenues	473869000	USD
CY2018	us-gaap	Revenues Revenues	436816000	USD
CY2017	us-gaap	Revenues Revenues	440603000	USD
CY2019	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	72289000	USD
CY2018	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	68904000	USD
CY2017	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	68302000	USD
CY2019	awr	Power Purchased For Pumping PowerPurchasedForPumping	8660000	USD
CY2018	awr	Power Purchased For Pumping PowerPurchasedForPumping	8971000	USD
CY2017	awr	Power Purchased For Pumping PowerPurchasedForPumping	8518000	USD
CY2019	awr	Groundwater Production Assessment GroundwaterProductionAssessment	18962000	USD
CY2018	awr	Groundwater Production Assessment GroundwaterProductionAssessment	19440000	USD
CY2017	awr	Groundwater Production Assessment GroundwaterProductionAssessment	18638000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-19095000	USD
CY2019	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	11796000	USD
CY2018	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	11590000	USD
CY2017	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	10720000	USD
CY2019	awr	Supply Cost Balancing Accounts SupplyCostBalancingAccounts	-7026000	USD
CY2018	awr	Supply Cost Balancing Accounts SupplyCostBalancingAccounts	-15649000	USD
CY2017	awr	Supply Cost Balancing Accounts SupplyCostBalancingAccounts	-17939000	USD
CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	32756000	USD
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	31650000	USD
CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	29994000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	83034000	USD
CY2018	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	82595000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	81643000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	35397000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	40425000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	39031000	USD
CY2019	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	15466000	USD
CY2018	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	15682000	USD
CY2017	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	15176000	USD
CY2019	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	20042000	USD
CY2018	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	18404000	USD
CY2017	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	17905000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	55673000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	53906000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	49838000	USD
CY2019	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	253000	USD
CY2018	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	85000	USD
CY2017	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	8318000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	346796000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	335833000	USD
CY2017	us-gaap	Operating Expenses OperatingExpenses	313508000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	127073000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	100983000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	127095000	USD
CY2019	us-gaap	Interest Expense InterestExpense	24586000	USD
CY2018	us-gaap	Interest Expense InterestExpense	23433000	USD
CY2017	us-gaap	Interest Expense InterestExpense	22582000	USD
CY2019	us-gaap	Investment Income Interest InvestmentIncomeInterest	3249000	USD
CY2018	us-gaap	Investment Income Interest InvestmentIncomeInterest	3578000	USD
CY2017	us-gaap	Investment Income Interest InvestmentIncomeInterest	1790000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3276000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	760000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2038000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-18061000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-18754000	USD
CY2019	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	109012000	USD
CY2018	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	81888000	USD
CY2017	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	108341000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24670000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18017000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38974000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	84342000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	63871000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	69367000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36814000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36733000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36638000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.28
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.73
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.88
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36964000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36936000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36844000	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.28
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.72
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.88
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.160
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.060
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.994
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	494297000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	69367000	USD
CY2017	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	909000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1789000	USD
CY2017	awr	Dividends Equivalent Rights On Share Based Compensation Not Paid In Cash Net Of Tax DividendsEquivalentRightsOnShareBasedCompensationNotPaidInCashNetOfTax	194000	USD
CY2017	us-gaap	Dividends Common Stock DividendsCommonStock	36417000	USD
CY2017	awr	Dividends Equivalent Rights On Share Based Compensation Net Of Tax DividendsEquivalentRightsOnShareBasedCompensationNetOfTax	194000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	529945000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	63871000	USD
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	546000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2798000	USD
CY2018	awr	Dividends Equivalent Rights On Share Based Compensation Not Paid In Cash Net Of Tax DividendsEquivalentRightsOnShareBasedCompensationNotPaidInCashNetOfTax	221000	USD
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	38937000	USD
CY2018	awr	Dividends Equivalent Rights On Share Based Compensation Net Of Tax DividendsEquivalentRightsOnShareBasedCompensationNetOfTax	221000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	558223000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	84342000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	84342000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	519000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1148000	USD
CY2019	awr	Dividends Equivalent Rights On Share Based Compensation Not Paid In Cash Net Of Tax DividendsEquivalentRightsOnShareBasedCompensationNotPaidInCashNetOfTax	210000	USD
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	42702000	USD
CY2019	awr	Dividends Equivalent Rights On Share Based Compensation Net Of Tax DividendsEquivalentRightsOnShareBasedCompensationNetOfTax	210000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	601530000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	84342000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	63871000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	69367000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	35713000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	40663000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	39273000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	608000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	841000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	989000	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	6623000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-5773000	USD
CY2017	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	12153000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	2517000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	3851000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	2885000	USD
CY2019	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	253000	USD
CY2018	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	85000	USD
CY2017	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	8318000	USD
CY2019	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	3580000	USD
CY2018	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-558000	USD
CY2017	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	1743000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-526000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-97000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-218000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-1882000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-1882000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	7671000	USD
CY2019	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	5515000	USD
CY2018	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	-2823000	USD
CY2017	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	2020000	USD
CY2019	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-214000	USD
CY2018	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-5151000	USD
CY2017	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	1671000	USD
CY2019	awr	Increase Decrease Receivable From Government IncreaseDecreaseReceivableFromGovernment	-1144000	USD
CY2018	awr	Increase Decrease Receivable From Government IncreaseDecreaseReceivableFromGovernment	20976000	USD
CY2017	awr	Increase Decrease Receivable From Government IncreaseDecreaseReceivableFromGovernment	-4742000	USD
CY2019	us-gaap	Increase Decrease In Materials And Supplies IncreaseDecreaseInMaterialsAndSupplies	654000	USD
CY2018	us-gaap	Increase Decrease In Materials And Supplies IncreaseDecreaseInMaterialsAndSupplies	980000	USD
CY2017	us-gaap	Increase Decrease In Materials And Supplies IncreaseDecreaseInMaterialsAndSupplies	501000	USD
CY2019	awr	Increase Decrease In Costs In Excess Of Billings On Uncompleted Contracts Or Programs IncreaseDecreaseInCostsInExcessOfBillingsOnUncompletedContractsOrPrograms	0	USD
CY2017	awr	Increase Decreasein Contract Assets IncreaseDecreaseinContractAssets	0	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-3978000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	519000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1641000	USD
CY2019	awr	Increase Decreasein Contract Assets IncreaseDecreaseinContractAssets	-3979000	USD
CY2018	awr	Increase Decreasein Contract Assets IncreaseDecreaseinContractAssets	-5941000	USD
CY2018	awr	Increase Decrease In Costs In Excess Of Billings On Uncompleted Contracts Or Programs IncreaseDecreaseInCostsInExcessOfBillingsOnUncompletedContractsOrPrograms	0	USD
CY2017	awr	Increase Decrease In Costs In Excess Of Billings On Uncompleted Contracts Or Programs IncreaseDecreaseInCostsInExcessOfBillingsOnUncompletedContractsOrPrograms	2881000	USD
CY2019	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	11597000	USD
CY2018	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-33834000	USD
CY2017	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-24626000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-249000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	1282000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	4358000	USD
CY2019	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-3786000	USD
CY2018	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	2708000	USD
CY2017	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	13206000	USD
CY2019	us-gaap	Increase Decrease In Billing In Excess Of Cost Of Earnings IncreaseDecreaseInBillingInExcessOfCostOfEarnings	3637000	USD
CY2018	us-gaap	Increase Decrease In Billing In Excess Of Cost Of Earnings IncreaseDecreaseInBillingInExcessOfCostOfEarnings	3619000	USD
CY2017	us-gaap	Increase Decrease In Billing In Excess Of Cost Of Earnings IncreaseDecreaseInBillingInExcessOfCostOfEarnings	1648000	USD
CY2019	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	1994000	USD
CY2018	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-1086000	USD
CY2017	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-878000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-4659000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-928000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-1589000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	116864000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	136774000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	144552000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	151940000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	126561000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	113126000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	169000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	72000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	34324000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1424000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1553000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1229000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-153195000	USD
CY2019	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	10171000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-128042000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-80031000	USD
CY2019	awr	Proceeds From Issuance Of Common Shares And Stock Option Exercises ProceedsFromIssuanceOfCommonSharesAndStockOptionExercises	519000	USD
CY2018	awr	Proceeds From Issuance Of Common Shares And Stock Option Exercises ProceedsFromIssuanceOfCommonSharesAndStockOptionExercises	546000	USD
CY2017	awr	Proceeds From Issuance Of Common Shares And Stock Option Exercises ProceedsFromIssuanceOfCommonSharesAndStockOptionExercises	909000	USD
CY2018	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	5551000	USD
CY2017	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	7275000	USD
CY2019	us-gaap	Repayments Of Advances For Construction RepaymentsOfAdvancesForConstruction	5005000	USD
CY2018	us-gaap	Repayments Of Advances For Construction RepaymentsOfAdvancesForConstruction	3886000	USD
CY2017	us-gaap	Repayments Of Advances For Construction RepaymentsOfAdvancesForConstruction	3889000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	40325000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	326000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	329000	USD
CY2019	us-gaap	Increase Decrease In Notes Payable Current IncreaseDecreaseInNotesPayableCurrent	109500000	USD
CY2018	us-gaap	Increase Decrease In Notes Payable Current IncreaseDecreaseInNotesPayableCurrent	36500000	USD
CY2017	us-gaap	Increase Decrease In Notes Payable Current IncreaseDecreaseInNotesPayableCurrent	-31000000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	42702000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	38937000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	36417000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1634000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1253000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1292000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	30524000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1805000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-64743000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-5807000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	6927000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-222000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	7141000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	214000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	436000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1334000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	7141000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	214000	USD
CY2019	awr	Number Of Customers NumberOfCustomers	1000000000000	customer
CY2019Q4	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	9
CY2019	awr	Number Of Registrants Filing Combined Report NumberOfRegistrantsFilingCombinedReport	2	registrant
CY2019	us-gaap	Related Party Transaction Amounts Of Transaction RelatedPartyTransactionAmountsOfTransaction	4700000	USD
CY2018	us-gaap	Related Party Transaction Amounts Of Transaction RelatedPartyTransactionAmountsOfTransaction	4200000	USD
CY2017	us-gaap	Related Party Transaction Amounts Of Transaction RelatedPartyTransactionAmountsOfTransaction	4000000.0	USD
CY2019	us-gaap	Related Party Transaction Terms And Manner Of Settlement RelatedPartyTransactionTermsAndMannerOfSettlement	P24M
CY2019	us-gaap	Related Party Transaction Terms And Manner Of Settlement RelatedPartyTransactionTermsAndMannerOfSettlement	P24M
CY2019Q4	us-gaap	Asset Retirement Obligation Legally Restricted Assets Fair Value AssetRetirementObligationLegallyRestrictedAssetsFairValue	0	USD
CY2019	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	USD
CY2019	awr	Goodwill Acquired In Prior Period GoodwillAcquiredInPriorPeriod	1100000	USD
CY2019	awr	Goodwill Acquired In Prior Period GoodwillAcquiredInPriorPeriod	1100000	USD
CY2019Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	0	USD
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	7600000	USD
CY2019Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	8000000.0	USD
CY2019	awr	Revenue Performance Obligation Payment Terms RevenuePerformanceObligationPaymentTerms	P20D
CY2019	us-gaap	Revenues Revenues	473869000	USD
CY2018	us-gaap	Revenues Revenues	436816000	USD
CY2019	us-gaap	Prerequisites For Billing Long Term Contracts PrerequisitesForBillingLongTermContracts	P5Y
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	7300000	USD
CY2019Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	3200000000	USD
CY2019Q4	awr	Regulatory Asset Not Accruing Carrying Costs RegulatoryAssetNotAccruingCarryingCosts	43100000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	543263000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	561855000	USD
CY2019Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	119547000	USD
CY2018Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	78055000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1415705000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1296310000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	29989000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	30822000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	24309000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	24399000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	5680000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	6423000	USD
CY2019Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	402000	USD
CY2018Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	422000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1300000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1100000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1500000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	90000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	12000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	12000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	12000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	12000	USD
CY2019Q4	awr	Finite Lived Intangible Assets Estimated Future Amortization Expense FiniteLivedIntangibleAssetsEstimatedFutureAmortizationExpense	138000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	4963000	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	256000	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	46000	USD
CY2018	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	55000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	5228000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	271000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	173000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	86000	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	3451000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	8863000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	84342000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	63871000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	69367000	USD
CY2019	awr	Weighted Average Dividends Common Stock WeightedAverageDividendsCommonStock	42702000	USD
CY2018	awr	Weighted Average Dividends Common Stock WeightedAverageDividendsCommonStock	38937000	USD
CY2017	awr	Weighted Average Dividends Common Stock WeightedAverageDividendsCommonStock	36417000	USD
CY2019	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	180000	USD
CY2018	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	204000	USD
CY2017	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	197000	USD
CY2019	us-gaap	Undistributed Earnings UndistributedEarnings	41460000	USD
CY2018	us-gaap	Undistributed Earnings UndistributedEarnings	24730000	USD
CY2017	us-gaap	Undistributed Earnings UndistributedEarnings	32753000	USD
CY2019	awr	Undistributed Earnings Allocated To Common Stock UndistributedEarningsAllocatedToCommonStock	41285000	USD
CY2018	awr	Undistributed Earnings Allocated To Common Stock UndistributedEarningsAllocatedToCommonStock	24601000	USD
CY2017	awr	Undistributed Earnings Allocated To Common Stock UndistributedEarningsAllocatedToCommonStock	32577000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-175000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	-129000	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	-176000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	83987000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	63538000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	68994000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36814000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36733000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36638000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.28
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.73
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.88
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	83987000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	63538000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	68994000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-175000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-129000	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	-176000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	84162000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	63667000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	69170000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36814000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36733000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36638000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	150000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	203000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	206000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36964000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36936000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36844000	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.28
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.72
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.88
CY2019	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	88772	shares
CY2018	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	44906	shares
CY2017	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	56498	shares
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	30998	shares
CY2018	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	32142	shares
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	52936	shares
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	519000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	546000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	909000	USD
CY2019	awr	Proceedsfrom Stock Options Exercised Distributedto Subsidiaries ProceedsfromStockOptionsExercisedDistributedtoSubsidiaries	0	USD
CY2019Q4	awr	Dividend Reinvestment Plan Common Stock Capital Shares Reserved For Future Issuance DividendReinvestmentPlanCommonStockCapitalSharesReservedForFutureIssuance	1055948	shares
CY2019Q4	awr	Defined Contribution Plan Common Stock Capital Shares Reserved For Future Issuance DefinedContributionPlanCommonStockCapitalSharesReservedForFutureIssuance	387300	shares
CY2019Q4	us-gaap	Notes Payable To Bank NotesPayableToBank	205000000.0	USD
CY2019Q4	awr	Deferred Tax Assets Regulatory Assets And Liabilities Related To Itc And Excess Deferred Taxes DeferredTaxAssetsRegulatoryAssetsAndLiabilitiesRelatedToITCAndExcessDeferredTaxes	33080000	USD
CY2018Q4	awr	Deferred Tax Assets Regulatory Assets And Liabilities Related To Itc And Excess Deferred Taxes DeferredTaxAssetsRegulatoryAssetsAndLiabilitiesRelatedToITCAndExcessDeferredTaxes	33419000	USD
CY2019Q4	awr	Deferred Tax Assets Contributions And Advances DeferredTaxAssetsContributionsAndAdvances	5777000	USD
CY2018Q4	awr	Deferred Tax Assets Contributions And Advances DeferredTaxAssetsContributionsAndAdvances	5281000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5792000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2988000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	44649000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	41688000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	144444000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	131413000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	20641000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	18146000	USD
CY2019Q4	awr	Deferred Tax Liabilities Balancing And Memorandum Accounts DeferredTaxLiabilitiesBalancingAndMemorandumAccounts	4868000	USD
CY2018Q4	awr	Deferred Tax Liabilities Balancing And Memorandum Accounts DeferredTaxLiabilitiesBalancingAndMemorandumAccounts	6325000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	169953000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	155884000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	125304000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	114196000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	12507000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	17252000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	20978000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5540000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	6538000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5844000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	18047000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	23790000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	26822000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	6407000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-4334000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	11543000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	216000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1439000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	609000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	6623000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5773000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12152000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24670000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18017000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38974000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	22872000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	17196000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	37919000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4758000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3693000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4382000	USD
CY2019	awr	Effectiveincometaxratereconciliationchangeintaxrate Effectiveincometaxratereconciliationchangeintaxrate	0	USD
CY2018	awr	Effectiveincometaxratereconciliationchangeintaxrate Effectiveincometaxratereconciliationchangeintaxrate	14000	USD
CY2017	awr	Effectiveincometaxratereconciliationchangeintaxrate Effectiveincometaxratereconciliationchangeintaxrate	82000	USD
CY2019	awr	Incometaxratereconciliationexcessdeferredtaxamortization Incometaxratereconciliationexcessdeferredtaxamortization	1579000	USD
CY2018	awr	Incometaxratereconciliationexcessdeferredtaxamortization Incometaxratereconciliationexcessdeferredtaxamortization	2101000	USD
CY2017	awr	Incometaxratereconciliationexcessdeferredtaxamortization Incometaxratereconciliationexcessdeferredtaxamortization	0	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	1244000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	429000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	845000	USD
CY2019	awr	Income Tax Reconciliation Costof Removal IncomeTaxReconciliationCostofRemoval	1582000	USD
CY2018	awr	Income Tax Reconciliation Costof Removal IncomeTaxReconciliationCostofRemoval	1445000	USD
CY2017	awr	Income Tax Reconciliation Costof Removal IncomeTaxReconciliationCostofRemoval	1980000	USD
CY2019	awr	Income Tax Reconciliation Production Activities IncomeTaxReconciliationProductionActivities	0	USD
CY2018	awr	Income Tax Reconciliation Production Activities IncomeTaxReconciliationProductionActivities	26000	USD
CY2017	awr	Income Tax Reconciliation Production Activities IncomeTaxReconciliationProductionActivities	1421000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	71000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	69000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	93000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-972000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	354000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-596000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24670000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18017000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38974000	USD
CY2019	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	109012000	USD
CY2018	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	81888000	USD
CY2017	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	108341000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.226
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.220
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.360
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2017Q1	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	2200000	USD
CY2019	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	645000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2500000	USD
CY2019Q4	us-gaap	Regulatory Assets RegulatoryAssets	2700000	USD
CY2019	awr	Defined Benefit Plan Initial Health Care Cost Trend Rate For Employees Under Age Sixty Five DefinedBenefitPlanInitialHealthCareCostTrendRateForEmployeesUnderAgeSixtyFive	0.059
CY2019	awr	Defined Benefit Plan Ultimate Health Care Cost Trend Rate For Employees Under Age Sixty Five DefinedBenefitPlanUltimateHealthCareCostTrendRateForEmployeesUnderAgeSixtyFive	0.044
CY2019	awr	Defined Benefit Plan Initial Health Care Cost Trend Rate For Employees Of Age Sixty Five And Over DefinedBenefitPlanInitialHealthCareCostTrendRateForEmployeesOfAgeSixtyFiveAndOver	0.050
CY2019	awr	Defined Benefit Plan Ultimate Health Care Cost Trend Rate For Employees Of Age Sixty Five And Over DefinedBenefitPlanUltimateHealthCareCostTrendRateForEmployeesOfAgeSixtyFiveAndOver	0.042
CY2019	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	34000	USD
CY2019	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	29000	USD
CY2019	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	749000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2400000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2300000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	1600000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	1300000	USD
CY2017	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	1100000	USD
CY2019	awr	Number Of Stock Incentive Plans NumberOfStockIncentivePlans	3	stock_plan
CY2019	awr	Share Based Compensation Arrangementsby Share Based Payment Award Options Minimum Agefor Awardsto Vest Immediately ShareBasedCompensationArrangementsbyShareBasedPaymentAwardOptionsMinimumAgeforAwardstoVestImmediately	P55Y
CY2019	awr	Share Based Compensation Arrangementsby Share Based Payment Award Options Minimum Agefor Awardsto Vest Immediately ShareBasedCompensationArrangementsbyShareBasedPaymentAwardOptionsMinimumAgeforAwardstoVestImmediately	P55Y
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2517000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3851000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2885000	USD
CY2019Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	245000	USD
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CY2019	awr	Termestimatefortheenvironmentalcleanup Termestimatefortheenvironmentalcleanup	P2Y
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	13200000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1800000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	11700000	USD
CY2019	us-gaap	Lease Cost LeaseCost	3166000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	159000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y2M26D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.035
CY2019	us-gaap	Operating Lease Payments Use OperatingLeasePaymentsUse	18034000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	2800000	USD
CY2018	us-gaap	Operating Lease Expense OperatingLeaseExpense	2500000	USD
CY2017	us-gaap	Operating Lease Expense OperatingLeaseExpense	2400000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	2709000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	2530000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	2533000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	1497000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	2217000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	1007000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1779000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	546000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	1499000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	293000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	5246000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	311000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	15983000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	6184000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	2395000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	13588000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1849000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	11739000	USD
CY2019	us-gaap	Revenues Revenues	473869000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	127073000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	21337000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1415705000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	35397000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24670000	USD
CY2019	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	151940000	USD
CY2018	us-gaap	Revenues Revenues	436816000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	100983000	USD
CY2018	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	19855000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1296310000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	40425000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18017000	USD
CY2018	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	126561000	USD
CY2017	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	20792000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1204992000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	39031000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38974000	USD
CY2017	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	113126000	USD
CY2017	us-gaap	Revenues Revenues	440603000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	127095000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1415705000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1296310000	USD
CY2019Q4	awr	Assets Other Than Property Plant And Equipment Net AssetsOtherThanPropertyPlantAndEquipmentNet	225626000	USD
CY2018Q4	awr	Assets Other Than Property Plant And Equipment Net AssetsOtherThanPropertyPlantAndEquipmentNet	205123000	USD
CY2019Q4	us-gaap	Assets Assets	1641331000	USD
CY2018Q4	us-gaap	Assets Assets	1501433000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	951000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1041000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	764000	USD
CY2019	awr	Provision For Doubtful Accounts Continuing Operation ProvisionForDoubtfulAccountsContinuingOperation	609000	USD
CY2018	awr	Provision For Doubtful Accounts Continuing Operation ProvisionForDoubtfulAccountsContinuingOperation	841000	USD
CY2017	awr	Provision For Doubtful Accounts Continuing Operation ProvisionForDoubtfulAccountsContinuingOperation	989000	USD
CY2019	awr	Allowance For Doubtful Accounts Receivable Charge Offs Net Of Recoveries AllowanceForDoubtfulAccountsReceivableChargeOffsNetOfRecoveries	-644000	USD
CY2018	awr	Allowance For Doubtful Accounts Receivable Charge Offs Net Of Recoveries AllowanceForDoubtfulAccountsReceivableChargeOffsNetOfRecoveries	-931000	USD
CY2017	awr	Allowance For Doubtful Accounts Receivable Charge Offs Net Of Recoveries AllowanceForDoubtfulAccountsReceivableChargeOffsNetOfRecoveries	-712000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	916000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	951000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1041000	USD
CY2019Q4	awr	Allowance For Doubtful Accounts Related To Receivable From Customer AllowanceForDoubtfulAccountsRelatedToReceivableFromCustomer	857000	USD
CY2018Q4	awr	Allowance For Doubtful Accounts Related To Receivable From Customer AllowanceForDoubtfulAccountsRelatedToReceivableFromCustomer	892000	USD
CY2017Q4	awr	Allowance For Doubtful Accounts Related To Receivable From Customer AllowanceForDoubtfulAccountsRelatedToReceivableFromCustomer	806000	USD
CY2019Q4	awr	Allowance For Doubtful Accounts Related To Other Accounts Receivable AllowanceForDoubtfulAccountsRelatedToOtherAccountsReceivable	59000	USD
CY2018Q4	awr	Allowance For Doubtful Accounts Related To Other Accounts Receivable AllowanceForDoubtfulAccountsRelatedToOtherAccountsReceivable	59000	USD
CY2017Q4	awr	Allowance For Doubtful Accounts Related To Other Accounts Receivable AllowanceForDoubtfulAccountsRelatedToOtherAccountsReceivable	235000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	916000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	28006000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	16700000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	951000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1041000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	22496000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	21084000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	13615000	USD
CY2019	us-gaap	Interest Paid InterestPaid	25080000	USD
CY2018	us-gaap	Interest Paid InterestPaid	23471000	USD
CY2017	us-gaap	Interest Paid InterestPaid	22762000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	23736000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	27403000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	20131000	USD
CY2019	us-gaap	Contribution Of Property ContributionOfProperty	6220000	USD
CY2018	us-gaap	Contribution Of Property ContributionOfProperty	2082000	USD
CY2017	us-gaap	Contribution Of Property ContributionOfProperty	2082000	USD
CY2019Q1	us-gaap	Revenues Revenues	101733000	USD
CY2019Q2	us-gaap	Revenues Revenues	124647000	USD
CY2019Q3	us-gaap	Revenues Revenues	134496000	USD
CY2019Q4	us-gaap	Revenues Revenues	112993000	USD
CY2019	us-gaap	Revenues Revenues	473869000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	20195000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	39430000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	42724000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	24724000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	127073000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	12852000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	26784000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	84342000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.35
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.72
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.76
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.45
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.28
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.35
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.72
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.76
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.45
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.28
CY2018Q1	us-gaap	Revenues Revenues	94728000	USD
CY2018Q2	us-gaap	Revenues Revenues	106901000	USD
CY2018Q3	us-gaap	Revenues Revenues	124182000	USD
CY2018Q4	us-gaap	Revenues Revenues	111005000	USD
CY2018	us-gaap	Revenues Revenues	436816000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	18691000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	25568000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	33975000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	22749000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	100983000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	10782000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	16348000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	22952000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	13789000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	63871000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.29
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.44
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.37
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.73
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.29
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.44
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.37
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.72
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36814000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36733000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	36638000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36964000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36936000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36844000	shares
CY2019Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	225000000.0	USD
CY2019Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	225000000.0	USD
CY2019Q4	us-gaap	Notes Payable To Bank NotesPayableToBank	205000000.0	USD

Files In Submission

Name	View Source	Status
0001056903-20-000018-index-headers.html	Edgar Link	pending
0001056903-20-000018-index.html	Edgar Link	pending
0001056903-20-000018.txt	Edgar Link	pending
0001056903-20-000018-xbrl.zip	Edgar Link	pending
awr-20191231.xsd	Edgar Link	pending
awr-20191231x10k.htm	Edgar Link	pending
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awr-20191231_pre.xml	Edgar Link	unprocessable
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ex31110k2019.htm	Edgar Link	pending
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exhibits231-auditorsco.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
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$AWR
AMERICAN STATES WATER CO Stock $awr

2019 Q4 Form 10-K Financial Statement

#000105690320000018 Filed on February 24, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AWR AMERICAN STATES WATER CO Stock $awr

2019 Q4 Form 10-K Financial Statement

#000105690320000018 Filed on February 24, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AWR
AMERICAN STATES WATER CO Stock $awr