$CWT
CALIFORNIA WATER SERVICE GROUP Stock $cwt

$cwt Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000103520121000003 Filed on February 25, 2021

Income Statement

Concept	2019 Q4	2018 Q4	2018
Revenue	$176.9M	$174.3M	$674.7M
YoY Change	1.49%	1.81%	8.4%
Cost Of Revenue	$53.00M	$46.40M	$238.2M
YoY Change	14.22%	-0.22%	4.52%
Gross Profit	$123.9M	$127.9M	$460.0M
YoY Change	-3.13%	2.57%	2.63%
Gross Profit Margin	70.04%	73.38%	68.17%
Selling, General & Admin	$27.30M	$23.60M	$100.8M
YoY Change	15.68%	-10.61%	8.04%
% of Gross Profit	22.03%	18.45%	21.91%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$22.80M	$21.60M	$85.71M
YoY Change	5.56%	10.2%	9.05%
% of Gross Profit	18.4%	16.89%	18.63%
Operating Expenses	$100.8M	$92.80M	$330.9M
YoY Change	8.62%	3.11%	8.17%
Operating Profit	$20.36M	$26.54M	$110.5M
YoY Change	-23.29%	14.99%	3.23%
Interest Expense	-$10.50M	-$9.000M	-$37.90M
YoY Change	16.67%	4.65%	11.8%
% of Operating Profit	-51.58%	-33.92%	-34.29%
Other Income/Expense, Net	$1.800M	-$3.100M	-$7.102M
YoY Change	-158.06%	-875.0%	3203.26%
Pretax Income	$14.50M	$23.10M	$81.50M
YoY Change	-37.23%	-15.07%	-25.77%
Income Tax	$124.2M	-$39.60M	$15.87M
% Of Pretax Income	856.55%	-171.43%	19.47%
Net Earnings	$11.34M	$15.37M	$65.58M
YoY Change	-26.24%	1.72%	-10.09%
Net Earnings / Revenue	6.41%	8.82%	9.72%
Basic Earnings Per Share			$1.36
Diluted Earnings Per Share	$0.24	$0.32	$1.36
COMMON SHARES
Basic Shares Outstanding			48.06M shares
Diluted Shares Outstanding			48.06M shares

Balance Sheet

Concept	2019 Q4	2018 Q4	2018
SHORT-TERM ASSETS
Cash & Short-Term Investments	$42.70M	$47.20M	$47.20M
YoY Change	-9.53%	-50.21%	-50.21%
Cash & Equivalents	$42.65M	$47.18M	$47.20M
Short-Term Investments
Other Short-Term Assets	$22.71M	$18.57M	$75.80M
YoY Change	22.31%	5.24%	13.98%
Inventory	$7.700M	$6.600M	$6.600M
Prepaid Expenses
Receivables	$32.06M	$30.04M	$30.00M
Other Receivables	$29.10M	$29.10M	$29.10M
Total Short-Term Assets	$184.7M	$188.7M	$188.7M
YoY Change	-2.11%	-17.19%	-17.2%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.410B	$2.233B	$2.221B
YoY Change	7.94%	9.02%	9.03%
Goodwill	$2.959M	$2.615M
YoY Change	13.15%	0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$84.29M	$60.10M	$413.7M
YoY Change	40.26%	-1.12%	-11.28%
Total Long-Term Assets	$2.927B	$2.649B	$2.649B
YoY Change	10.48%	5.25%	5.25%
TOTAL ASSETS
Total Short-Term Assets	$184.7M	$188.7M	$188.7M
Total Long-Term Assets	$2.927B	$2.649B	$2.649B
Total Assets	$3.111B	$2.838B	$2.838B
YoY Change	9.64%	3.39%	3.39%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$108.5M	$95.58M	$95.60M
YoY Change	13.48%	1.73%	1.7%
Accrued Expenses	$48.80M	$43.40M	$23.10M
YoY Change	12.44%	-7.07%	1.32%
Deferred Revenue	$3.325M	$3.196M
YoY Change	4.04%
Short-Term Debt	$175.1M	$65.10M	$65.10M
YoY Change	168.97%	-76.34%	-76.34%
Long-Term Debt Due	$21.87M	$104.9M	$104.9M
YoY Change	-79.16%	558.99%	559.75%
Total Short-Term Liabilities	$358.7M	$321.2M	$321.2M
YoY Change	11.69%	-34.58%	-34.58%
LONG-TERM LIABILITIES
Long-Term Debt	$786.8M	$710.0M	$710.0M
YoY Change	10.81%	37.66%	37.65%
Other Long-Term Liabilities	$60.42M	$45.25M	$863.3M
YoY Change	33.53%	1.86%	2.27%
Total Long-Term Liabilities	$847.2M	$755.3M	$1.573B
YoY Change	12.17%	34.82%	15.69%
TOTAL LIABILITIES
Total Short-Term Liabilities	$358.7M	$321.2M	$321.2M
Total Long-Term Liabilities	$847.2M	$755.3M	$1.573B
Total Liabilities	$1.206B	$1.076B	$2.108B
YoY Change	12.03%	2.4%	3.03%
SHAREHOLDERS EQUITY
Retained Earnings	$417.1M	$392.1M
YoY Change	6.4%	8.15%
Common Stock	$362.8M	$338.1M
YoY Change	7.29%	0.41%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$779.9M	$730.2M	$730.2M
YoY Change
Total Liabilities & Shareholders Equity	$3.111B	$2.838B	$2.838B
YoY Change	9.64%	3.39%	3.39%

Cashflow Statement

Concept	2019 Q4	2018 Q4	2018
OPERATING ACTIVITIES
Net Income	$11.34M	$15.37M	$65.58M
YoY Change	-26.24%	1.72%	-10.09%
Depreciation, Depletion And Amortization	$22.80M	$21.60M	$85.71M
YoY Change	5.56%	10.2%	9.05%
Cash From Operating Activities	$40.50M	$59.50M	$179.0M
YoY Change	-31.93%	56.58%	21.09%
INVESTING ACTIVITIES
Capital Expenditures	-$78.90M	-$58.80M	-$271.7M
YoY Change	34.18%	-25.38%	4.82%
Acquisitions			$0.00
YoY Change
Other Investing Activities	$0.00	$0.00	-$1.400M
YoY Change		-100.0%	-102.66%
Cash From Investing Activities	-$78.80M	-$58.80M	-$273.1M
YoY Change	34.01%	147.06%	32.2%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$1.645M
YoY Change			9.3%
Debt Paid & Issued, Net			$16.53M
YoY Change			-38.38%
Cash From Financing Activities	29.80M	-20.00M	$46.48M
YoY Change	-249.0%	-138.83%	-63.72%
NET CHANGE
Cash From Operating Activities	40.50M	59.50M	$179.0M
Cash From Investing Activities	-78.80M	-58.80M	-$273.1M
Cash From Financing Activities	29.80M	-20.00M	$46.48M
Net Change In Cash	-8.500M	-19.30M	-$47.59M
YoY Change	-55.96%	-129.38%	-168.6%
FREE CASH FLOW
Cash From Operating Activities	$40.50M	$59.50M	$179.0M
Capital Expenditures	-$78.90M	-$58.80M	-$271.7M
Free Cash Flow	$119.4M	$118.3M	$450.7M
YoY Change	0.93%	1.28%	10.73%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
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CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	1-13883
CY2020	dei	Entity Registrant Name EntityRegistrantName	CALIFORNIA WATER SERVICE GROUP
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	77-0448994
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CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	4976000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	6685000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	3954000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	0	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	28000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	50000	USD
CY2020	cwt	Utilities Nonregulated Expense Income Tax Expense Benefit UtilitiesNonregulatedExpenseIncomeTaxExpenseBenefit	583000	USD
CY2019	cwt	Utilities Nonregulated Expense Income Tax Expense Benefit UtilitiesNonregulatedExpenseIncomeTaxExpenseBenefit	1391000	USD
CY2018	cwt	Utilities Nonregulated Expense Income Tax Expense Benefit UtilitiesNonregulatedExpenseIncomeTaxExpenseBenefit	-2717000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2027000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4925000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-7102000	USD
CY2020	us-gaap	Interest Expense Debt InterestExpenseDebt	45047000	USD
CY2019	us-gaap	Interest Expense Debt InterestExpenseDebt	44891000	USD
CY2018	us-gaap	Interest Expense Debt InterestExpenseDebt	39917000	USD
CY2020	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	3185000	USD
CY2019	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	3670000	USD
CY2018	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	2063000	USD
CY2020	us-gaap	Interest Costs Incurred InterestCostsIncurred	41862000	USD
CY2019	us-gaap	Interest Costs Incurred InterestCostsIncurred	41221000	USD
CY2018	us-gaap	Interest Costs Incurred InterestCostsIncurred	37854000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	96831000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	63116000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	65584000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.97
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.31
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.36
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.97
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.31
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.36
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	49274000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48168000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48060000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49274000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48168000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48060000	shares
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	699221000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	65584000	USD
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	3040000	USD
CY2018	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1645000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.7500
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	36043000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	730157000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	63116000	USD
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	27153000	USD
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	2497000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.7900
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	38023000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	779906000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	96831000	USD
CY2020	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	88054000	USD
CY2020	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1679000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.8500
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	41768000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	921344000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	96831000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	63116000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	65584000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	100935000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	91288000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	85707000	USD
CY2020	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	412000	USD
CY2019	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	744000	USD
CY2018	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	1099000	USD
CY2020	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-34440000	USD
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-15346000	USD
CY2018	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-20909000	USD
CY2020	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	4293000	USD
CY2019	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	5104000	USD
CY2018	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	-2334000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	4976000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	6685000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	3954000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	4590000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	6731000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	3141000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	0	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	28000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	50000	USD
CY2020	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	0	USD
CY2019	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	698000	USD
CY2018	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	410000	USD
CY2020	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	18343000	USD
CY2019	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	4580000	USD
CY2018	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-20422000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	-1148000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	1452000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	3671000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3647000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3545000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	587000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	373000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	10719000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	4701000	USD
CY2020	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-6097000	USD
CY2019	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	1282000	USD
CY2018	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-4382000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	83449000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	-264000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	12644000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	117924000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	168794000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	179019000	USD
CY2020	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	298651000	USD
CY2019	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	273770000	USD
CY2018	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	271707000	USD
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	28000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	59000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	40483000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2020	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	4600000	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2018	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2020	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	USD
CY2019	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	USD
CY2018	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	3491000	USD
CY2020	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	2335000	USD
CY2019	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	2216000	USD
CY2018	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	4925000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-346069000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-275958000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-273082000	USD
CY2020	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	335000000	USD
CY2019	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	260000000	USD
CY2018	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	151000000	USD
CY2020	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	140100000	USD
CY2019	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	150000000	USD
CY2018	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	361000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	398204000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	299383000	USD
CY2020	cwt	Proceeds From Contribution In Aid Of Construction Financing Activities ProceedsFromContributionInAidOfConstructionFinancingActivities	27292000	USD
CY2019	cwt	Proceeds From Contribution In Aid Of Construction Financing Activities ProceedsFromContributionInAidOfConstructionFinancingActivities	27774000	USD
CY2018	cwt	Proceeds From Contribution In Aid Of Construction Financing Activities ProceedsFromContributionInAidOfConstructionFinancingActivities	18612000	USD
CY2020	us-gaap	Repayments Of Advances For Construction RepaymentsOfAdvancesForConstruction	10203000	USD
CY2019	us-gaap	Repayments Of Advances For Construction RepaymentsOfAdvancesForConstruction	7566000	USD
CY2018	us-gaap	Repayments Of Advances For Construction RepaymentsOfAdvancesForConstruction	7297000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	22141000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	405568000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	16532000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1679000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2497000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1645000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	83575000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	20423000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	41768000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	38023000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	36043000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	229976000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	102747000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	46478000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1831000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-4417000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-47585000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	43298000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	47715000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	95300000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	45129000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	43298000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	47715000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	40792000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	40980000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	35941000	USD
CY2020	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	4700000	USD
CY2019	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	0	USD
CY2018	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	0	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Payables Assumed1 NoncashOrPartNoncashAcquisitionPayablesAssumed1	54987000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Payables Assumed1 NoncashOrPartNoncashAcquisitionPayablesAssumed1	40794000	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Payables Assumed1 NoncashOrPartNoncashAcquisitionPayablesAssumed1	38807000	USD
CY2020	cwt	Utility Plant Contribution By Developers UtilityPlantContributionByDevelopers	28672000	USD
CY2019	cwt	Utility Plant Contribution By Developers UtilityPlantContributionByDevelopers	16288000	USD
CY2018	cwt	Utility Plant Contribution By Developers UtilityPlantContributionByDevelopers	20609000	USD
CY2020	cwt	Litigation Proceedsfor Mtbe Contamination Reclassifiedfrom Other Long Term Liabilities LitigationProceedsforMTBEContaminationReclassifiedfromOtherLongTermLiabilities	445000	USD
CY2019	cwt	Litigation Proceedsfor Mtbe Contamination Reclassifiedfrom Other Long Term Liabilities LitigationProceedsforMTBEContaminationReclassifiedfromOtherLongTermLiabilities	13968000	USD
CY2018	cwt	Litigation Proceedsfor Mtbe Contamination Reclassifiedfrom Other Long Term Liabilities LitigationProceedsforMTBEContaminationReclassifiedfromOtherLongTermLiabilities	32315000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	697577000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	664358000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	674736000	USD
CY2020	us-gaap	Revenue Not From Contract With Customer RevenueNotFromContractWithCustomer	96730000	USD
CY2019	us-gaap	Revenue Not From Contract With Customer RevenueNotFromContractWithCustomer	50199000	USD
CY2018	us-gaap	Revenue Not From Contract With Customer RevenueNotFromContractWithCustomer	23460000	USD
CY2020	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	794307000	USD
CY2019	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	714557000	USD
CY2018	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	698196000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	697577000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	664358000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	674736000	USD
CY2020	cwt	Maximum Collection Period In Which Deferred Net Wram And Mcba Revenues And Associated Costs Will Be Recognized MaximumCollectionPeriodInWhichDeferredNetWRAMAndMCBARevenuesAndAssociatedCostsWillBeRecognized	P24M
CY2020	cwt	Maximum Collection Period In Which Deferred Net Wram And Mcba Revenues And Associated Costs Will Be Recognized MaximumCollectionPeriodInWhichDeferredNetWRAMAndMCBARevenuesAndAssociatedCostsWillBeRecognized	P24M
CY2020	us-gaap	Revenue Recognition Leases RevenueRecognitionLeases	<span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Lease revenue is not considered revenue from contracts with customers and is recognized following operating lease standards. The Company is the lessor in operating lease agreements with telecommunications companies under which cellular phone antennas are placed on the Company's property. The Company provides the lessee the right to ingress and egress across lessor property to access the antennas. The minimum rents are recognized on a straight-line basis over the terms of the leases, which may span multiple years. The excess rents are recognized over amounts contractually due pursuant to the underlying leases and is included in a deferred receivable account in the accompanying balance sheet. The leases generally have terms of</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%"> </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">5 to 10 years, with lessee options to extend the lease for up to</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:400;line-height:120%"> </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">15 years. The exercise of lease renewal options is at the lessee’s sole discretion. Most of the Company’s lease agreements contain mutual termination options that require prior written notice by either lessee or lessor. A subset of the Company’s leases contains variable lease payments that depend on changes in the consumer price index (CPI).</span>
CY2020Q4	us-gaap	Lessor Operating Lease Renewal Term LessorOperatingLeaseRenewalTerm	P15Y
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	2779000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	1916000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	1438000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	1152000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	688000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	319000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Policy For Uncollectible Amounts FinancingReceivableAllowanceForCreditLossesPolicyForUncollectibleAmounts	<div style="margin-bottom:8pt;margin-top:8pt;text-align:justify;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Allowance for Credit Losses</span></div><div style="margin-bottom:8pt;margin-top:8pt;text-align:justify;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company measures expected credit losses for Customer Receivables, Other Receivables, and Unbilled Revenue on an aggregated level. These receivables are generally trade receivables due in one year or less or expected to be billed and collected in one year or less. The expected credit losses for Other Receivables and Unbilled Revenue are inconsequential. Customer receivables include receivables for water and wastewater services provided to residential customers, business, industrial, public authorities, and other customers. The expected credit losses for business, industrial, public authorities, and other customers are inconsequential. The overall risks related to the Company’s receivables are low as water and wastewater services are seen as essential services. The estimate for the allowance for credit losses is based on a historical loss ratio, in conjunction with a qualitative assessment of elements that impact the collectability of receivables to determine if the allowance for credit losses should be further adjusted in accordance with the accounting guidance for credit losses. Management contemplates available current information such as changes in economic factors, regulatory matters, industry trends, payment options and programs available to customers, and the methods that the Company is able to utilize to ensure payment. </span></div><div style="margin-bottom:8pt;margin-top:8pt;text-align:justify;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">In 2020, the Company reviewed its allowance for credit losses utilizing a quantitative assessment, which included trend analysis of customer billing and collection, aging by customer class, and unemployment rates since the outbreak of COVID-19 in the first quarter of 2020. The Company also utilized a qualitative assessment, which considered the future collectability on customer outstanding balances, management's estimate of the cash recovery, and a general assessment of the economic conditions of the locations the Company serves due to the outbreak of COVID-19. The Company is complying with the CPUC requirements to suspend customer disconnections for non-payment and ceased agency collection activities, and anticipates this situation will continue until further notice. Based on the above assessments, the Company expects an increase in customer receivable write-offs as compared to historical experiences and adjusted its allowance for credit losses, accordingly.</span></div>
CY2020Q4	cwt	Accounts Receivable From Developers Current AccountsReceivableFromDevelopersCurrent	9077000	USD
CY2019Q4	cwt	Accounts Receivable From Developers Current AccountsReceivableFromDevelopersCurrent	6299000	USD
CY2020Q4	us-gaap	Interest Receivable Current InterestReceivableCurrent	5561000	USD
CY2019Q4	us-gaap	Interest Receivable Current InterestReceivableCurrent	764000	USD
CY2020Q4	cwt	Other Nontrade Receivables Current OtherNontradeReceivablesCurrent	5693000	USD
CY2019Q4	cwt	Other Nontrade Receivables Current OtherNontradeReceivablesCurrent	7124000	USD
CY2020Q4	us-gaap	Nontrade Receivables Current NontradeReceivablesCurrent	20331000	USD
CY2019Q4	us-gaap	Nontrade Receivables Current NontradeReceivablesCurrent	14187000	USD
CY2020	us-gaap	Public Utilities Property Plant And Equipment Common Useful Life PublicUtilitiesPropertyPlantAndEquipmentCommonUsefulLife	P50Y
CY2020	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0294
CY2019	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0296
CY2018	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0302
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	4976000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	6685000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	3954000	USD
CY2020	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	3185000	USD
CY2019	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	3670000	USD
CY2018	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	2063000	USD
CY2020	cwt	Allowancefor Equityand Borrowed Funds Used During Construction AllowanceforEquityandBorrowedFundsUsedDuringConstruction	8161000	USD
CY2019	cwt	Allowancefor Equityand Borrowed Funds Used During Construction AllowanceforEquityandBorrowedFundsUsedDuringConstruction	10355000	USD
CY2018	cwt	Allowancefor Equityand Borrowed Funds Used During Construction AllowanceforEquityandBorrowedFundsUsedDuringConstruction	6017000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	27800000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	25600000	USD
CY2020	cwt	Deposit Assets Cash Collected Through Surcharge On Customers Bills DepositAssetsCashCollectedThroughSurchargeOnCustomersBills	600000	USD
CY2019	cwt	Deposit Assets Cash Collected Through Surcharge On Customers Bills DepositAssetsCashCollectedThroughSurchargeOnCustomersBills	600000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	44555000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	42653000	USD
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	574000	USD
CY2019Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	645000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	45129000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	43298000	USD
CY2020	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	400000	USD
CY2019	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	700000	USD
CY2018	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	1100000	USD
CY2019Q4	us-gaap	Contract With Customer Refund Liability Noncurrent ContractWithCustomerRefundLiabilityNoncurrent	191100000	USD
CY2020	cwt	Customer Advances For Construction Specified Refund Period CustomerAdvancesForConstructionSpecifiedRefundPeriod	P40Y
CY2020Q4	us-gaap	Contract With Customer Refund Liability Noncurrent ContractWithCustomerRefundLiabilityNoncurrent	195600000	USD
CY2020Q4	cwt	Customer Advances For Construction Refunds Due Year One CustomerAdvancesForConstructionRefundsDueYearOne	8935000	USD
CY2020Q4	cwt	Customer Advances For Construction Refunds Due Year Two CustomerAdvancesForConstructionRefundsDueYearTwo	8841000	USD
CY2020Q4	cwt	Customer Advances For Construction Refunds Due Year Three CustomerAdvancesForConstructionRefundsDueYearThree	8791000	USD
CY2020Q4	cwt	Customer Advances For Construction Refunds Due Year Four CustomerAdvancesForConstructionRefundsDueYearFour	8689000	USD
CY2020Q4	cwt	Customer Advances For Construction Refunds Due Year Five CustomerAdvancesForConstructionRefundsDueYearFive	8434000	USD
CY2020Q4	cwt	Customer Advances For Construction Refunds Due Thereafter CustomerAdvancesForConstructionRefundsDueThereafter	151935000	USD
CY2020Q4	cwt	Customer Advances For Construction Refunds Due CustomerAdvancesForConstructionRefundsDue	195625000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	96831000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	63116000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	65584000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	49274000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48168000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48060000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48060000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49274000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48168000	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.97
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.31
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.36
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.97
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.31
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.36
CY2020	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	16922000	USD
CY2020	cwt	Other Nonoperating Expense Income OtherNonoperatingExpenseIncome	14300000	USD
CY2019	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	19205000	USD
CY2019	cwt	Other Nonoperating Expense Income OtherNonoperatingExpenseIncome	13869000	USD
CY2018	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	18272000	USD
CY2018	cwt	Other Nonoperating Expense Income OtherNonoperatingExpenseIncome	22787000	USD
CY2018	us-gaap	Other Research And Development Expense OtherResearchAndDevelopmentExpense	5400000	USD
CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	325376000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	433322000	USD
CY2020Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	180718000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	211413000	USD
CY2020Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	96200000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	38200000	USD
CY2020Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	34600000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	4500000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	23700000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	15447000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	8253000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	21078000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	13955000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	7123000	USD
CY2020Q4	us-gaap	Other Indefinite Lived Intangible Assets OtherIndefiniteLivedIntangibleAssets	3867000	USD
CY2020Q4	us-gaap	Other Indefinite Lived Intangible Assets OtherIndefiniteLivedIntangibleAssets	3867000	USD
CY2019Q4	us-gaap	Other Indefinite Lived Intangible Assets OtherIndefiniteLivedIntangibleAssets	3776000	USD
CY2019Q4	us-gaap	Other Indefinite Lived Intangible Assets OtherIndefiniteLivedIntangibleAssets	3776000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1100000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1500000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1700000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1168000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1055000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	867000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	726000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	599000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	3838000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	8253000	USD
CY2019Q1	cwt	Preferred Stock Shares Retired PreferredStockSharesRetired	221000	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	50333655	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	48532199	shares
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	4490000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	4693000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	786227000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	808622000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	5127000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	21868000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	781100000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	786754000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	22543000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	19473000	USD
CY2020Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	5733000	USD
CY2019Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	6241000	USD
CY2020Q4	us-gaap	Contract With Customer Refund Liability Current ContractWithCustomerRefundLiabilityCurrent	2172000	USD
CY2019Q4	us-gaap	Contract With Customer Refund Liability Current ContractWithCustomerRefundLiabilityCurrent	2024000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	3305000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	3325000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1757000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1452000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	4123000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	2988000	USD
CY2020Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	36563000	USD
CY2019Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	38573000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	14692000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2677000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12015000	USD
CY2020	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	14692000	USD
CY2020	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	-2674000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12018000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	15582000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2086000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	17668000	USD
CY2019	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	15582000	USD
CY2019	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	2089000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17671000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	15995000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-126000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	15869000	USD
CY2018	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	15995000	USD
CY2018	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	-123000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15872000	USD
CY2020	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	164000000.0	USD
CY2020Q4	cwt	Tax Cutsand Jobs Actof2017 Incomplete Accounting Ratepayer Net Refund TaxCutsandJobsActof2017IncompleteAccountingRatepayerNetRefund	105000000.0	USD
CY2019	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	70000000.0	USD
CY2018	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	102000000.0	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	22858000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	16965000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	17105000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	7598000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5639000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5685000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-9201000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-3696000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-5954000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	74000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	74000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	302000	USD
CY2018	cwt	Effective Income Tax Rate Reconciliation Afudc Equity Amount EffectiveIncomeTaxRateReconciliationAFUDCEquityAmount	1106000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	523000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	74000	USD
CY2020	cwt	Effective Income Tax Rate Reconciliation Afudc Equity Amount EffectiveIncomeTaxRateReconciliationAFUDCEquityAmount	1392000	USD
CY2019	cwt	Effective Income Tax Rate Reconciliation Afudc Equity Amount EffectiveIncomeTaxRateReconciliationAFUDCEquityAmount	1870000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-278000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	-9470000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	0	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	0	USD
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	1176000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	405000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	494000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12018000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17671000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15872000	USD
CY2017Q4	cwt	Tax Cutsand Jobs Actof2017 Incomplete Accounting Ratepayer Net Refund TaxCutsandJobsActof2017IncompleteAccountingRatepayerNetRefund	108000000.0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	12031000	USD
CY2020Q4	cwt	Deferred Tax Assets Developer Deposits For Extension Agreements And Contributions In Aid Of Construction DeferredTaxAssetsDeveloperDepositsForExtensionAgreementsAndContributionsInAidOfConstruction	29491000	USD
CY2019Q4	cwt	Deferred Tax Assets Developer Deposits For Extension Agreements And Contributions In Aid Of Construction DeferredTaxAssetsDeveloperDepositsForExtensionAgreementsAndContributionsInAidOfConstruction	25114000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	37326000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	11029000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	10095000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	41151000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	47196000	USD
CY2020Q4	cwt	Deferred Tax Asset Operating Lease Liability DeferredTaxAssetOperatingLeaseLiability	4372000	USD
CY2019Q4	cwt	Deferred Tax Asset Operating Lease Liability DeferredTaxAssetOperatingLeaseLiability	4024000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2812000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2975000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	127183000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	100433000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	350923000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	297470000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	39107000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	17771000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	4362000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	4030000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	8823000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3752000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	403215000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	323023000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	276032000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	222590000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11008000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	9716000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11058000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2952000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1292000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1787000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	3129000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	13960000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11008000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	9716000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	3700000	USD
CY2020	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.20
CY2020	cwt	Defined Contribution Plan Employer Matching Contribution On Dollar For Participant Contributions DefinedContributionPlanEmployerMatchingContributionOnDollarForParticipantContributions	0.75	USD
CY2020	cwt	Defined Contribution Plan Maximum Employer Contribution As Percentage Of Compensation DefinedContributionPlanMaximumEmployerContributionAsPercentageOfCompensation	0.060
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	6500000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	6000000.0	USD
CY2020Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.055
CY2020Q4	cwt	Defined Benefit Plan Health Care Cost Trend Rate Assumed Year Three DefinedBenefitPlanHealthCareCostTrendRateAssumedYearThree	0.050
CY2020Q4	cwt	Defined Benefit Plan Ultimate Health Care Cost Trend Rate Benefit Obligation DefinedBenefitPlanUltimateHealthCareCostTrendRateBenefitObligation	0.038
CY2020	cwt	Defined Benefit Plan Period For Health Care Cost Trend Rate To Reach Ultimate Trend Rate Benefit Obligation DefinedBenefitPlanPeriodForHealthCareCostTrendRateToReachUltimateTrendRateBenefitObligation	P40Y
CY2020Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.055
CY2020Q4	cwt	Defined Benefit Plan Health Care Cost Trend Rate Assumed Year Three DefinedBenefitPlanHealthCareCostTrendRateAssumedYearThree	0.050
CY2020Q4	cwt	Defined Benefit Plan Ultimate Health Care Cost Trend Rate Net Periodic Benefit Cost DefinedBenefitPlanUltimateHealthCareCostTrendRateNetPeriodicBenefitCost	0.040
CY2020	cwt	Defined Benefit Plan Period For Health Care Cost Trend Rate To Reach Ultimate Trend Rate Net Periodic Benefit Cost DefinedBenefitPlanPeriodForHealthCareCostTrendRateToReachUltimateTrendRateNetPeriodicBenefitCost	P53Y
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	2000000	shares
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4400000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6500000	USD
CY2020	cwt	Fair Value Inputs Risk Premium FairValueInputsRiskPremium	0.0183
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	12928000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	15625000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	14380000	USD
CY2020Q4	cwt	Finance Lease Right Of Use Asset Gross FinanceLeaseRightOfUseAssetGross	18207000	USD
CY2019Q4	cwt	Finance Lease Right Of Use Asset Gross FinanceLeaseRightOfUseAssetGross	18207000	USD
CY2020Q4	cwt	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	10813000	USD
CY2019Q4	cwt	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	9644000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	7394000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	8563000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	721000	USD
CY2020Q4	us-gaap	Lessee Finance Lease Renewal Term1 LesseeFinanceLeaseRenewalTerm1	P25Y
CY2020Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P25Y
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	15589000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	14402000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1757000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1452000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	13868000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	680000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	4483000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	5205000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	5204000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	5885000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P135M
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P152M
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P64M
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P76M
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.035
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.037
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.055
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.055
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	2284000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	1874000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1169000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1210000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	306000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	347000	USD
CY2020	cwt	Finance Lease Cost Total FinanceLeaseCostTotal	1475000	USD
CY2019	cwt	Finance Lease Cost Total FinanceLeaseCostTotal	1557000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	2048000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1700000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	306000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	264000	USD
CY2020	us-gaap	Lease Cost LeaseCost	6113000	USD
CY2019	us-gaap	Lease Cost LeaseCost	5395000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	2000000.0	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	2306000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	1820000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	306000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	347000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	680000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	672000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	3100000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2109000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	672000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	2302000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	987000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	2012000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	987000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1767000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	1506000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1631000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	940000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	1571000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	940000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	10947000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	705000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	20230000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	6065000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	4605000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	861000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	15625000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	5204000	USD
CY2020Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	2600000	USD

Files In Submission

Name	View Source	Status
0001035201-21-000003-index-headers.html	Edgar Link	pending
0001035201-21-000003-index.html	Edgar Link	pending
0001035201-21-000003.txt	Edgar Link	pending
0001035201-21-000003-xbrl.zip	Edgar Link	pending
cwt-20201231.htm	Edgar Link	pending
cwt-20201231.xsd	Edgar Link	pending
cwt-20201231xex21ng.htm	Edgar Link	pending
cwt-20201231xex221ng.htm	Edgar Link	pending
cwt-20201231xex231ng.htm	Edgar Link	pending
cwt-20201231xex311ng.htm	Edgar Link	pending
cwt-20201231xex312ng.htm	Edgar Link	pending
cwt-20201231xex32ng.htm	Edgar Link	pending
cwt-20201231xex416ng.htm	Edgar Link	pending
cwt-20201231_cal.xml	Edgar Link	unprocessable
cwt-20201231_def.xml	Edgar Link	unprocessable
cwt-20201231_g1.jpg	Edgar Link	pending
cwt-20201231_htm.xml	Edgar Link	completed
cwt-20201231_lab.xml	Edgar Link	unprocessable
cwt-20201231_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$CWT
CALIFORNIA WATER SERVICE GROUP Stock $cwt

2019 Q4 Form 10-K Financial Statement

#000103520121000003 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CWT CALIFORNIA WATER SERVICE GROUP Stock $cwt

2019 Q4 Form 10-K Financial Statement

#000103520121000003 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CWT
CALIFORNIA WATER SERVICE GROUP Stock $cwt