$CWT
CALIFORNIA WATER SERVICE GROUP Stock $cwt

$cwt Overview Financials Valuation SEC Filings Company Website

2016 Q4 Form 10-K Financial Statement

#000103520118000003 Filed on March 01, 2018

Income Statement

Concept	2016 Q4	2016 Q3	2016 Q2
Revenue	$150.9M	$184.3M	$152.4M
YoY Change	9.03%	0.44%	5.54%
Cost Of Revenue	$39.90M	$70.20M	$57.60M
YoY Change	5.56%	16.23%	8.68%
Gross Profit	$111.0M	$114.1M	$94.80M
YoY Change	10.34%	-7.31%	3.72%
Gross Profit Margin	73.56%	61.91%	62.2%
Selling, General & Admin	$12.60M	$23.80M	$23.40M
YoY Change	-55.0%	-22.48%	-12.03%
% of Gross Profit	11.35%	20.86%	24.68%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$16.30M	$16.20M	$16.20M
YoY Change	3.16%	3.18%	1.25%
% of Gross Profit	14.68%	14.2%	17.09%
Operating Expenses	$73.20M	$70.80M	$69.40M
YoY Change	-10.84%	-6.35%	-0.57%
Operating Profit	$21.34M	$30.06M	$18.53M
YoY Change	42.59%	-6.66%	12.37%
Interest Expense	-$7.900M	-$7.700M	-$7.600M
YoY Change	6.76%	14.93%	15.15%
% of Operating Profit	-37.03%	-25.62%	-41.01%
Other Income/Expense, Net	-$8.000M	$531.0K	$571.0K
YoY Change	-766.67%	-240.48%	-3906.67%
Pretax Income	$21.80M	$36.50M	$18.80M
YoY Change	73.02%	-9.2%	26.17%
Income Tax	$6.700M	$13.60M	$7.254M
% Of Pretax Income	30.73%	37.25%	38.59%
Net Earnings	$15.09M	$22.88M	$11.51M
YoY Change	78.01%	-8.94%	16.89%
Net Earnings / Revenue	10.0%	12.41%	7.55%
Basic Earnings Per Share		$0.48	$0.24
Diluted Earnings Per Share	$0.31	$0.48	$0.24
COMMON SHARES
Basic Shares Outstanding		47.97M shares	47.97M shares
Diluted Shares Outstanding		47.97M shares	47.97M shares

Balance Sheet

Concept	2016 Q4	2016 Q3	2016 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$25.50M	$21.40M	$30.80M
YoY Change	189.77%	-57.87%	25.71%
Cash & Equivalents	$25.94M	$21.35M	$30.83M
Short-Term Investments
Other Short-Term Assets	$13.55M	$16.66M	$19.65M
YoY Change	-4.79%	11.76%	-71.48%
Inventory	$6.300M	$6.300M	$6.400M
Prepaid Expenses
Receivables	$30.31M	$45.38M	$36.64M
Other Receivables	$24.40M	$24.60M	$25.20M
Total Short-Term Assets	$142.1M	$151.1M	$159.0M
YoY Change	11.36%	-20.9%	5.86%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.859B	$1.818B	$1.785B
YoY Change	9.25%	9.27%	9.07%
Goodwill	$2.615M	$2.615M	$2.615M
YoY Change	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$51.85M	$50.95M	$48.11M
YoY Change	9.4%	0.42%	-89.39%
Total Long-Term Assets	$2.270B	$2.235B	$2.199B
YoY Change	7.38%	5.65%	5.08%
TOTAL ASSETS
Total Short-Term Assets	$142.1M	$151.1M	$159.0M
Total Long-Term Assets	$2.270B	$2.235B	$2.199B
Total Assets	$2.412B	$2.386B	$2.358B
YoY Change	7.61%	3.45%	5.13%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$77.81M	$84.05M	$77.60M
YoY Change	17.22%	8.79%	12.96%
Accrued Expenses	$44.40M	$53.90M	$40.50M
YoY Change	12.12%	-31.34%	-38.54%
Deferred Revenue
YoY Change
Short-Term Debt	$97.10M	$57.10M	$75.10M
YoY Change	188.86%	-58.2%	-40.68%
Long-Term Debt Due	$26.21M	$6.130M	$6.133M
YoY Change	333.69%	-6.63%	-7.08%
Total Short-Term Liabilities	$250.2M	$204.0M	$202.0M
YoY Change	69.19%	-32.18%	-25.29%
LONG-TERM LIABILITIES
Long-Term Debt	$531.7M	$555.5M	$555.8M
YoY Change	4.67%	33.4%	33.35%
Other Long-Term Liabilities	$44.91M	$691.5M	$692.2M
YoY Change	-4.74%	-2.88%	-2.71%
Total Long-Term Liabilities	$576.7M	$555.5M	$555.8M
YoY Change	3.87%	33.4%	-50.74%
TOTAL LIABILITIES
Total Short-Term Liabilities	$250.2M	$204.0M	$202.0M
Total Long-Term Liabilities	$576.7M	$555.5M	$555.8M
Total Liabilities	$826.9M	$759.5M	$757.8M
YoY Change	17.61%	5.9%	-53.22%
SHAREHOLDERS EQUITY
Retained Earnings	$324.1M	$317.3M	$302.7M
YoY Change	5.05%	3.0%
Common Stock	$335.3M	$334.7M	$334.0M
YoY Change	0.52%	0.58%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$659.5M	$652.0M	$636.8M
YoY Change
Total Liabilities & Shareholders Equity	$2.412B	$2.386B	$2.358B
YoY Change	7.61%	3.45%	5.13%

Cashflow Statement

Concept	2016 Q4	2016 Q3	2016 Q2
OPERATING ACTIVITIES
Net Income	$15.09M	$22.88M	$11.51M
YoY Change	78.01%	-8.94%	16.89%
Depreciation, Depletion And Amortization	$16.30M	$16.20M	$16.20M
YoY Change	3.16%	3.18%	1.25%
Cash From Operating Activities	$36.60M	$64.70M	$28.10M
YoY Change	30.25%	-5.13%	31.31%
INVESTING ACTIVITIES
Capital Expenditures	-$62.50M	-$50.20M	-$59.70M
YoY Change	6.84%	18.12%	46.32%
Acquisitions
YoY Change
Other Investing Activities	$900.0K	-$1.700M	-$300.0K
YoY Change	28.57%	-10.53%	50.0%
Cash From Investing Activities	-$61.60M	-$51.90M	-$60.00M
YoY Change	6.39%	16.89%	46.7%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	29.10M	-22.30M	31.90M
YoY Change	-338.52%	-992.0%	198.13%
NET CHANGE
Cash From Operating Activities	36.60M	64.70M	28.10M
Cash From Investing Activities	-61.60M	-51.90M	-60.00M
Cash From Financing Activities	29.10M	-22.30M	31.90M
Net Change In Cash	4.100M	-9.500M	-0.000000007451
YoY Change	-109.76%	-136.12%	-100.0%
FREE CASH FLOW
Cash From Operating Activities	$36.60M	$64.70M	$28.10M
Capital Expenditures	-$62.50M	-$50.20M	-$59.70M
Free Cash Flow	$99.10M	$114.9M	$87.80M
YoY Change	14.43%	3.79%	41.16%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2016Q4	cwt	Accounts Payable Including Regulatory Liability Current AccountsPayableIncludingRegulatoryLiabilityCurrent	77813000	USD
CY2017Q4	cwt	Accounts Payable Including Regulatory Liability Current AccountsPayableIncludingRegulatoryLiabilityCurrent	93955000	USD
CY2016Q4	cwt	Accrued Expenses And Other Liabilities Including Accrued Interest AccruedExpensesAndOtherLiabilitiesIncludingAccruedInterest	49109000	USD
CY2017Q4	cwt	Accrued Expenses And Other Liabilities Including Accrued Interest AccruedExpensesAndOtherLiabilitiesIncludingAccruedInterest	105984000	USD
CY2017	cwt	Additional Gain For Cost Recovery Expenses AdditionalGainForCostRecoveryExpenses	0	USD
CY2016Q4	cwt	Affiliate Long Term Debt AffiliateLongTermDebt	0	USD
CY2017Q4	cwt	Affiliate Long Term Debt AffiliateLongTermDebt	0	USD
CY2015	cwt	Allowancefor Equityand Borrowed Funds Used During Construction AllowanceforEquityandBorrowedFundsUsedDuringConstruction	1915000	USD
CY2016	cwt	Allowancefor Equityand Borrowed Funds Used During Construction AllowanceforEquityandBorrowedFundsUsedDuringConstruction	2965000	USD
CY2017	cwt	Allowancefor Equityand Borrowed Funds Used During Construction AllowanceforEquityandBorrowedFundsUsedDuringConstruction	6110000	USD
CY2017	cwt	Commercial Paper Maturity Period CommercialPaperMaturityPeriod	P90D
CY2017	cwt	Completed Contract Method Maximum Contract Completion Period CompletedContractMethodMaximumContractCompletionPeriod	P3M
CY2017Q4	cwt	Customer Advances For Construction Refunds Due Year Five CustomerAdvancesForConstructionRefundsDueYearFive	7600000	USD
CY2017Q4	cwt	Customer Advances For Construction Refunds Due Year Four CustomerAdvancesForConstructionRefundsDueYearFour	7600000	USD
CY2017Q4	cwt	Customer Advances For Construction Refunds Due Year One CustomerAdvancesForConstructionRefundsDueYearOne	7900000	USD
CY2017Q4	cwt	Customer Advances For Construction Refunds Due Year Three CustomerAdvancesForConstructionRefundsDueYearThree	7700000	USD
CY2017Q4	cwt	Customer Advances For Construction Refunds Due Year Two CustomerAdvancesForConstructionRefundsDueYearTwo	7700000	USD
CY2017	cwt	Customer Advances For Construction Specified Refund Period CustomerAdvancesForConstructionSpecifiedRefundPeriod	P40Y
CY2016Q4	cwt	Deferred Tax Assets Developer Deposits For Extension Agreements And Contributions In Aid Of Construction DeferredTaxAssetsDeveloperDepositsForExtensionAgreementsAndContributionsInAidOfConstruction	46318000	USD
CY2017Q4	cwt	Deferred Tax Assets Developer Deposits For Extension Agreements And Contributions In Aid Of Construction DeferredTaxAssetsDeveloperDepositsForExtensionAgreementsAndContributionsInAidOfConstruction	33552000	USD
CY2017	cwt	Defined Benefit Plan Health Care Cost Trend Rate Assumed By Specified Period DefinedBenefitPlanHealthCareCostTrendRateAssumedBySpecifiedPeriod	0.052
CY2017	cwt	Defined Benefit Plan Period In Which Rate Reaches Ultimate Trend Rate DefinedBenefitPlanPeriodInWhichRateReachesUltimateTrendRate	P50Y
CY2017	cwt	Defined Contribution Plan Employer Matching Contribution On Dollar For Participant Contributions DefinedContributionPlanEmployerMatchingContributionOnDollarForParticipantContributions	0.75	USD
CY2017	cwt	Defined Contribution Plan Maximum Employer Contribution As Percentage Of Compensation DefinedContributionPlanMaximumEmployerContributionAsPercentageOfCompensation	0.06
CY2017Q4	cwt	Deposit Assets Cash Collected Through Surcharge On Customers Bills DepositAssetsCashCollectedThroughSurchargeOnCustomersBills	500000	USD
CY2015	cwt	Effective Income Tax Rate Reconciliation Afudc Equity Amount EffectiveIncomeTaxRateReconciliationAFUDCEquityAmount	0	USD
CY2016	cwt	Effective Income Tax Rate Reconciliation Afudc Equity Amount EffectiveIncomeTaxRateReconciliationAFUDCEquityAmount	0	USD
CY2017	cwt	Effective Income Tax Rate Reconciliation Afudc Equity Amount EffectiveIncomeTaxRateReconciliationAFUDCEquityAmount	1528000	USD
CY2017	cwt	Effective Income Tax Rate Reconciliation Sharebased Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitAmount	600000	USD
CY2017	cwt	Expected Collection Period For Undercollected Net Wram And Mcba Receivables ExpectedCollectionPeriodForUndercollectedNetWRAMAndMCBAReceivables	P18M
CY2017	cwt	Fair Value Inputs Risk Premium FairValueInputsRiskPremium	0.0170
CY2015	cwt	Increase Decrease In Other Noncurrent Assets And Liabilities Net Including Amortization Of Debt Premium And Expenses IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNetIncludingAmortizationOfDebtPremiumAndExpenses	-11773000	USD
CY2016	cwt	Increase Decrease In Other Noncurrent Assets And Liabilities Net Including Amortization Of Debt Premium And Expenses IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNetIncludingAmortizationOfDebtPremiumAndExpenses	-6906000	USD
CY2017	cwt	Increase Decrease In Other Noncurrent Assets And Liabilities Net Including Amortization Of Debt Premium And Expenses IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNetIncludingAmortizationOfDebtPremiumAndExpenses	-21724000	USD
CY2015	cwt	Litigation Proceedsfor Mtbe Contamination Reclassifiedfrom Other Long Term Liabilities LitigationProceedsforMTBEContaminationReclassifiedfromOtherLongTermLiabilities	332000	USD
CY2016	cwt	Litigation Proceedsfor Mtbe Contamination Reclassifiedfrom Other Long Term Liabilities LitigationProceedsforMTBEContaminationReclassifiedfromOtherLongTermLiabilities	484000	USD
CY2017	cwt	Litigation Proceedsfor Mtbe Contamination Reclassifiedfrom Other Long Term Liabilities LitigationProceedsforMTBEContaminationReclassifiedfromOtherLongTermLiabilities	2420000	USD
CY2017	cwt	Maximum Collection Period In Which Deferred Net Wram And Mcba Revenues And Associated Costs Will Be Recognized MaximumCollectionPeriodInWhichDeferredNetWRAMAndMCBARevenuesAndAssociatedCostsWillBeRecognized	P24M
CY2017	cwt	Minimum Collection Period After Net Receivable Balances Were Recognized In Which The Company Defers Net Wra Mand Mcba Operating Revenues And Associated Costs MinimumCollectionPeriodAfterNetReceivableBalancesWereRecognizedInWhichTheCompanyDefersNetWRAMandMCBAOperatingRevenuesAndAssociatedCosts	P12M
CY2015	cwt	Other Nonoperating Expense Income OtherNonoperatingExpenseIncome	14044000	USD
CY2016	cwt	Other Nonoperating Expense Income OtherNonoperatingExpenseIncome	11445000	USD
CY2017	cwt	Other Nonoperating Expense Income OtherNonoperatingExpenseIncome	9390000	USD
CY2015	cwt	Payments For Proceeds From Investment In And Advances To Affiliate Related To Investing Activities PaymentsForProceedsFromInvestmentInAndAdvancesToAffiliateRelatedToInvestingActivities	0	USD
CY2016	cwt	Payments For Proceeds From Investment In And Advances To Affiliate Related To Investing Activities PaymentsForProceedsFromInvestmentInAndAdvancesToAffiliateRelatedToInvestingActivities	0	USD
CY2017	cwt	Payments For Proceeds From Investment In And Advances To Affiliate Related To Investing Activities PaymentsForProceedsFromInvestmentInAndAdvancesToAffiliateRelatedToInvestingActivities	0	USD
CY2015	cwt	Paymentsfor Affiliate Longterm Debt PaymentsforAffiliateLongtermDebt	0	USD
CY2016	cwt	Paymentsfor Affiliate Longterm Debt PaymentsforAffiliateLongtermDebt	0	USD
CY2017	cwt	Paymentsfor Affiliate Longterm Debt PaymentsforAffiliateLongtermDebt	0	USD
CY2015	cwt	Paymentsfor Affiliate Short Term Borrowings PaymentsforAffiliateShortTermBorrowings	0	USD
CY2016	cwt	Paymentsfor Affiliate Short Term Borrowings PaymentsforAffiliateShortTermBorrowings	0	USD
CY2015	cwt	Paymentsfor Long Term Debtfrom Affiliate PaymentsforLongTermDebtfromAffiliate	0	USD
CY2016	cwt	Paymentsfor Long Term Debtfrom Affiliate PaymentsforLongTermDebtfromAffiliate	0	USD
CY2017	cwt	Paymentsfor Long Term Debtfrom Affiliate PaymentsforLongTermDebtfromAffiliate	0	USD
CY2015	cwt	Paymentsfor Shortterm Debtfrom Affiliate PaymentsforShorttermDebtfromAffiliate	0	USD
CY2016	cwt	Paymentsfor Shortterm Debtfrom Affiliate PaymentsforShorttermDebtfromAffiliate	0	USD
CY2015	cwt	Proceedsfrom Affiliate Short Term Borrowings ProceedsfromAffiliateShortTermBorrowings	0	USD
CY2016	cwt	Proceedsfrom Affiliate Short Term Borrowings ProceedsfromAffiliateShortTermBorrowings	0	USD
CY2017	cwt	Proceedsfrom Affiliate Short Term Borrowings ProceedsfromAffiliateShortTermBorrowings	0	USD
CY2015	cwt	Proceedsfrom Issuanceof Shortterm Debtfrom Affiliate ProceedsfromIssuanceofShorttermDebtfromAffiliate	0	USD
CY2016	cwt	Proceedsfrom Issuanceof Shortterm Debtfrom Affiliate ProceedsfromIssuanceofShorttermDebtfromAffiliate	0	USD
CY2017	cwt	Proceedsfrom Issuanceof Shortterm Debtfrom Affiliate ProceedsfromIssuanceofShorttermDebtfromAffiliate	0	USD
CY2016Q4	cwt	Regulatory And Other Liabilities RegulatoryAndOtherLiabilities	83648000	USD
CY2017Q4	cwt	Regulatory And Other Liabilities RegulatoryAndOtherLiabilities	224127000	USD
CY2017Q4	cwt	Tax Cutsand Jobs Actof2017 Incomplete Accounting Ratepayer Net Refund TaxCutsandJobsActof2017IncompleteAccountingRatepayerNetRefund	108000000	USD
CY2016Q4	cwt	Taxes Prepaid Expenses And Other Assets Current TaxesPrepaidExpensesAndOtherAssetsCurrent	7262000	USD
CY2017Q4	cwt	Taxes Prepaid Expenses And Other Assets Current TaxesPrepaidExpensesAndOtherAssetsCurrent	11180000	USD
CY2016Q4	cwt	Total Other Assets TotalOtherAssets	410399000	USD
CY2017Q4	cwt	Total Other Assets TotalOtherAssets	464537000	USD
CY2016Q4	cwt	Unearned Revenue Liability Included In Accrued Expenses And Other Liabilities UnearnedRevenueLiabilityIncludedInAccruedExpensesAndOtherLiabilities	800000	USD
CY2017Q4	cwt	Unearned Revenue Liability Included In Accrued Expenses And Other Liabilities UnearnedRevenueLiabilityIncludedInAccruedExpensesAndOtherLiabilities	700000	USD
CY2015	cwt	Utilities Nonregulated Expense Income Tax Expense Benefit UtilitiesNonregulatedExpenseIncomeTaxExpenseBenefit	761000	USD
CY2016	cwt	Utilities Nonregulated Expense Income Tax Expense Benefit UtilitiesNonregulatedExpenseIncomeTaxExpenseBenefit	2012000	USD
CY2017	cwt	Utilities Nonregulated Expense Income Tax Expense Benefit UtilitiesNonregulatedExpenseIncomeTaxExpenseBenefit	4435000	USD
CY2015	cwt	Utilities Operating Expense Income Tax Expense Benefit UtilitiesOperatingExpenseIncomeTaxExpenseBenefit	24528000	USD
CY2016	cwt	Utilities Operating Expense Income Tax Expense Benefit UtilitiesOperatingExpenseIncomeTaxExpenseBenefit	24804000	USD
CY2017	cwt	Utilities Operating Expense Income Tax Expense Benefit UtilitiesOperatingExpenseIncomeTaxExpenseBenefit	28928000	USD
CY2015Q4	cwt	Utility Plant Contribution By Developers UtilityPlantContributionByDevelopers	7383000	USD
CY2016Q4	cwt	Utility Plant Contribution By Developers UtilityPlantContributionByDevelopers	16824000	USD
CY2017Q4	cwt	Utility Plant Contribution By Developers UtilityPlantContributionByDevelopers	19898000	USD
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0001035201
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	48011346	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	1767000000	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	CALIFORNIA WATER SERVICE GROUP
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	77813000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	93955000	USD
CY2016Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	30305000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	32451000	USD
CY2016Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	3629000	USD
CY2017Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	3888000	USD
CY2016Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	35060000	USD
CY2017Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	36671000	USD
CY2016Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	1798000	USD
CY2017Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	1724000	USD
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	334856000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	336229000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	830000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	773000	USD
CY2015	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	825000	USD
CY2015	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	800000	USD
CY2016	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	900000	USD
CY2016	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	871000	USD
CY2017	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	900000	USD
CY2017	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	920000	USD
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1400000	USD
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1600000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1600000	USD
CY2016Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	20300000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	21200000	USD
CY2016Q4	us-gaap	Assets Assets	2411745000	USD
CY2017Q4	us-gaap	Assets Assets	2740375000	USD
CY2016Q4	us-gaap	Assets Current AssetsCurrent	142069000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	227873000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	1053000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	977000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	977000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	977000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	1284000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	3581000	USD
CY2016Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1191216000	USD
CY2017Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	1209255000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	19587000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	8837000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	25492000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	94776000	USD
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2015	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.670
CY2016Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.1725
CY2016Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.1725
CY2016Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.1725
CY2016Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.1725
CY2016	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.690
CY2017Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.18
CY2017Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.18
CY2017Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.18
CY2017Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.18
CY2017	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.720
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	68000000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	68000000	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	47964915	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	48012432	shares
CY2016Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	47964915	shares
CY2015	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	168557000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	130000	USD
CY2016Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	47965000	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	48012000	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	48012432	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	480000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	480000	USD
CY2016Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	180790000	USD
CY2017Q4	us-gaap	Contributions In Aid Of Construction ContributionsInAidOfConstruction	186721000	USD
CY2015	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	27890000	USD
CY2016	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	27180000	USD
CY2017	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	28862000	USD
CY2016	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	181515000	USD
CY2017	us-gaap	Cost Of Purchased Water CostOfPurchasedWater	199081000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	9591000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	11297000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	132000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1706000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3000	USD
CY2016Q4	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	182448000	USD
CY2017Q4	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	182502000	USD
CY2016Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.0133
CY2017Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.0205
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	15374000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	26603000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	32652000	USD
CY2016Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	4475000	USD
CY2017Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	3889000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	13992000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	26684000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	33359000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	373106000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	289725000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1382000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	81000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	707000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	74182000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	96779000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	12348000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	13329000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5651000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	280000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	0	USD
CY2017Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	41712000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	9865000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	7906000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	298924000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	192946000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	298924000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	192946000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	5321000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2550000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	347071000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	262442000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	20714000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	24733000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	28762000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	2795000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	39117000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	3919000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.068
CY2015	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	15100000	USD
CY2016	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	8900000	USD
CY2017	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	8500000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.047
CY2015	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5000000	USD
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5400000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5600000	USD
CY2017	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.2
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	63182000	USD
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	65203000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	78592000	USD
CY2015	us-gaap	Dividends Common Stock DividendsCommonStock	32066000	USD
CY2016	us-gaap	Dividends Common Stock DividendsCommonStock	33081000	USD
CY2017	us-gaap	Dividends Common Stock DividendsCommonStock	34563000	USD
CY2016Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	0	USD
CY2017Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	0	USD
CY2016Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	0	USD
CY2017Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	0	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.94
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.02
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.40
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.94
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.02
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.24
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.01
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.02
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.70
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.29
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.40
CY2016Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	22572000	USD
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	23916000	USD
CY2015	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	24965000	USD
CY2016	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	26733000	USD
CY2017	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	32652000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	10108000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	11218000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	2700000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1400000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	500000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	600000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	700000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1200000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	18149000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	18432000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	8041000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	7214000	USD
CY2015	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	315000	USD
CY2016	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-146000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	663000	USD
CY2016	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	1500000	USD
CY2015	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	113110000	USD
CY2016	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	98474000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	102914000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	2615000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	2615000	USD
CY2015	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	25289000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	26816000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	33362000	USD
CY2015	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	65200000	USD
CY2016	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	84900000	USD
CY2017	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	85700000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	24607000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	26422000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	35190000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-3450000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-4298000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-4584000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	0	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	0	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-581000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	163000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	425000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-842000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4043000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4341000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5781000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	74000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	74000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	74000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-819000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	3839000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	1564000	USD
CY2015	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-24393000	USD
CY2016	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-26818000	USD
CY2017	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-21087000	USD
CY2015	us-gaap	Increase Decrease In Due To Affiliates IncreaseDecreaseInDueToAffiliates	0	USD
CY2016	us-gaap	Increase Decrease In Due To Affiliates IncreaseDecreaseInDueToAffiliates	0	USD
CY2017	us-gaap	Increase Decrease In Due To Affiliates IncreaseDecreaseInDueToAffiliates	0	USD
CY2015	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-1106000	USD
CY2016	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	4056000	USD
CY2017	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	2164000	USD
CY2015	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	-10948000	USD
CY2016	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	-6906000	USD
CY2017	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	-19511000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	1877000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-6781000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	36389000	USD
CY2015	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	2366000	USD
CY2016	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-1276000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3718000	USD
CY2015	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-1855000	USD
CY2016	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	343000	USD
CY2017	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	31871000	USD
CY2015	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-288000	USD
CY2016	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-66000	USD
CY2017	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	81000	USD
CY2015	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	-559000	USD
CY2016	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	2047000	USD
CY2017	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	4528000	USD
CY2015	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	15000	shares
CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	3000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2015	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	1915000	USD
CY2016	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	2965000	USD
CY2017Q4	us-gaap	Interest Payable Current InterestPayableCurrent	6122000	USD
CY2016Q4	us-gaap	Investments In And Advances To Affiliates Amount Of Equity InvestmentsInAndAdvancesToAffiliatesAmountOfEquity	0	USD
CY2017Q4	us-gaap	Investments In And Advances To Affiliates Amount Of Equity InvestmentsInAndAdvancesToAffiliatesAmountOfEquity	0	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2411745000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2740375000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	250230000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	490959000	USD
CY2015	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	-218000	USD
CY2017	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	2360000	USD
CY2015	us-gaap	Interest Costs Incurred InterestCostsIncurred	27270000	USD
CY2016	us-gaap	Interest Costs Incurred InterestCostsIncurred	30501000	USD
CY2017	us-gaap	Interest Costs Incurred InterestCostsIncurred	33928000	USD
CY2015	us-gaap	Interest Expense Debt InterestExpenseDebt	29185000	USD
CY2016	us-gaap	Interest Expense Debt InterestExpenseDebt	33466000	USD
CY2017	us-gaap	Interest Expense Debt InterestExpenseDebt	36288000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	25345000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	28038000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	32223000	USD
CY2016Q4	us-gaap	Interest Payable Current InterestPayableCurrent	5661000	USD
CY2016	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	1026000	USD
CY2017	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	3058000	USD
CY2016	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	65804000	USD
CY2017	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	179739000	USD
CY2016	us-gaap	Line Of Credit Facility Maximum Amount Outstanding During Period LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod	97100000	USD
CY2017	us-gaap	Line Of Credit Facility Maximum Amount Outstanding During Period LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod	275100000	USD
CY2016Q4	us-gaap	Long Term Debt LongTermDebt	557953000	USD
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	531713000	USD
CY2016Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	26208000	USD
CY2017Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	15920000	USD
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	531745000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	515793000	USD
CY2017Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	6100000	USD
CY2015	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-10750000	USD
CY2016	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	16655000	USD
CY2017	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	69284000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	22539000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	87050000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	128094000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-178258000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-230839000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-206652000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	144969000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	160444000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	147842000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	-798000	USD
CY2015	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	14044000	USD
CY2016	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	11445000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	11508000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	22875000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	15090000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	1132000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	18531000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	33849000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	13669000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	45017000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	48675000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	67181000	USD
CY2015	us-gaap	Noncash Or Part Noncash Acquisition Payables Assumed1 NoncashOrPartNoncashAcquisitionPayablesAssumed1	21546000	USD
CY2016	us-gaap	Noncash Or Part Noncash Acquisition Payables Assumed1 NoncashOrPartNoncashAcquisitionPayablesAssumed1	27150000	USD
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Payables Assumed1 NoncashOrPartNoncashAcquisitionPayablesAssumed1	41017000	USD
CY2015	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	0	USD
CY2016	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	3221000	USD
CY2017	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	1293000	USD
CY2016Q4	us-gaap	Nontrade Receivables Current NontradeReceivablesCurrent	17158000	USD
CY2017Q4	us-gaap	Nontrade Receivables Current NontradeReceivablesCurrent	16464000	USD
CY2016Q4	us-gaap	Notes Receivable Related Parties Noncurrent NotesReceivableRelatedPartiesNoncurrent	0	USD
CY2017Q4	us-gaap	Notes Receivable Related Parties Noncurrent NotesReceivableRelatedPartiesNoncurrent	0	USD
CY2017	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	71153000	USD
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	6270000	USD
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	18534000	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	30055000	USD
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	21335000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	76194000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	8050000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	25259000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	41196000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	20118000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	94623000	USD
CY2016Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	6028000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	6115000	USD
CY2016Q4	us-gaap	Other Assets Current OtherAssetsCurrent	13554000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	17643000	USD
CY2016Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	54469000	USD
CY2017Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	63390000	USD
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	51854000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	60775000	USD
CY2016Q4	us-gaap	Other Indefinite Lived Intangible Assets OtherIndefiniteLivedIntangibleAssets	3776000	USD
CY2017Q4	us-gaap	Other Indefinite Lived Intangible Assets OtherIndefiniteLivedIntangibleAssets	3780000	USD
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	44913000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	44421000	USD
CY2017	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	9390000	USD
CY2016	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	395000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	666000	USD
CY2015	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	94303000	USD
CY2016	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	145100000	USD
CY2017	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	265000000	USD
CY2015	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	0	USD
CY2016	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	0	USD
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	3750000	USD
CY2016Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	6292000	USD
CY2017Q4	us-gaap	Public Utilities Inventory PublicUtilitiesInventory	6463000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	858062000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	922214000	USD
CY2017	us-gaap	Public Utilities Property Plant And Equipment Common Useful Life PublicUtilitiesPropertyPlantAndEquipmentCommonUsefulLife	P50Y
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	132957000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	175693000	USD
CY2015	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0280
CY2016	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0270
CY2017	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0300
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Equipment PublicUtilitiesPropertyPlantAndEquipmentEquipment	2522174000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Equipment PublicUtilitiesPropertyPlantAndEquipmentEquipment	2729757000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Land PublicUtilitiesPropertyPlantAndEquipmentLand	40283000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Land PublicUtilitiesPropertyPlantAndEquipmentLand	42517000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	1859277000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	2047965000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	21925000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	22212000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	2717339000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	2970179000	USD
CY2015	us-gaap	Pump Taxes PumpTaxes	11479000	USD
CY2016	us-gaap	Pump Taxes PumpTaxes	11298000	USD
CY2017	us-gaap	Pump Taxes PumpTaxes	13924000	USD
CY2016Q4	us-gaap	Receivables Long Term Contracts Or Programs ReceivablesLongTermContractsOrPrograms	25228000	USD
CY2017Q4	us-gaap	Receivables Long Term Contracts Or Programs ReceivablesLongTermContractsOrPrograms	29756000	USD
CY2016Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	103023000	USD
CY2017Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	115454000	USD
CY2015	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	588368000	USD
CY2016Q1	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	121727000	USD
CY2016Q2	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	152445000	USD
CY2016Q3	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	184268000	USD
CY2016Q4	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	150930000	USD
CY2016	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	609370000	USD
CY2017Q1	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	122036000	USD
CY2017Q2	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	171132000	USD
CY2017Q3	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	211731000	USD
CY2017Q4	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	161991000	USD
CY2017	us-gaap	Regulated Operating Revenue Water RegulatedOperatingRevenueWater	666890000	USD
CY2016Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	30300000	USD
CY2016Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	30332000	USD
CY2017Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	36800000	USD
CY2017Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	36783000	USD
CY2016Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	355930000	USD
CY2017Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	401147000	USD
CY2016Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	4759000	USD
CY2016Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	4800000	USD
CY2017Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	59300000	USD
CY2017Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	59303000	USD
CY2016Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	38735000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	744000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1505000	USD
CY2015	us-gaap	Payments Of Distributions To Affiliates PaymentsOfDistributionsToAffiliates	0	USD
CY2016	us-gaap	Payments Of Distributions To Affiliates PaymentsOfDistributionsToAffiliates	0	USD
CY2017	us-gaap	Payments Of Distributions To Affiliates PaymentsOfDistributionsToAffiliates	0	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	32066000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	33081000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	34563000	USD
CY2015	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	0	USD
CY2015	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	2032000	USD
CY2016	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	2857000	USD
CY2017	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	5605000	USD
CY2015	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	176833000	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1134000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2982000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	6486000	USD
CY2016Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	222691000	USD
CY2017Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	252141000	USD
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	338000	USD
CY2016	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	228938000	USD
CY2017	us-gaap	Payments To Acquire Water And Waste Water Systems PaymentsToAcquireWaterAndWasteWaterSystems	259194000	USD
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	241000	shares
CY2016Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2016Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2015	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	16026000	USD
CY2016	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	21448000	USD
CY2017	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	21369000	USD
CY2015	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	0	USD
CY2015	us-gaap	Proceeds From Dividends Received ProceedsFromDividendsReceived	0	USD
CY2016	us-gaap	Proceeds From Dividends Received ProceedsFromDividendsReceived	0	USD
CY2017	us-gaap	Proceeds From Dividends Received ProceedsFromDividendsReceived	0	USD
CY2015	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	0	USD
CY2016	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	0	USD
CY2017	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	1697000	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	99343000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	49823000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2015	us-gaap	Proceeds From Legal Settlements ProceedsFromLegalSettlements	0	USD
CY2016	us-gaap	Proceeds From Legal Settlements ProceedsFromLegalSettlements	0	USD
CY2017	us-gaap	Proceeds From Legal Settlements ProceedsFromLegalSettlements	56004000	USD
CY2015	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	USD
CY2016	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	495000	USD
CY2017	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1558000	USD
CY2015	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	319000	USD
CY2015	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	15624000	USD
CY2016	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	16585000	USD
CY2017	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	15898000	USD
CY2017Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	179706000	USD
CY2015	us-gaap	Repayments Of Advances For Construction RepaymentsOfAdvancesForConstruction	6726000	USD
CY2016	us-gaap	Repayments Of Advances For Construction RepaymentsOfAdvancesForConstruction	6885000	USD
CY2017	us-gaap	Repayments Of Advances For Construction RepaymentsOfAdvancesForConstruction	8378000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	7003000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	6996000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	26829000	USD
CY2015	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	141000000	USD
CY2016	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	81615000	USD
CY2017	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	87000000	USD
CY2016Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	400000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	600000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	324135000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	356753000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	2578000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	2849000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	3118000	USD
CY2016Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	97100000	USD
CY2017Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	275100000	USD
CY2015	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	324000	USD
CY2016	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	83000	USD
CY2017	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	710000	USD
CY2015	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	2578000	USD
CY2016	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1722000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1373000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	626626000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	642155000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	659471000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	693462000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	7916000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	10298000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	10499000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11058000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2382000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	201000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	559000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2100000	USD
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47865000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47953000	shares
CY2015	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	517215000	USD
CY2017	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	74448000	USD
CY2015	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	21559000	USD
CY2016	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	533176000	USD
CY2017	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	572267000	USD
CY2015	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	61381000	USD
CY2016	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	63599000	USD
CY2017	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	76783000	USD
CY2015	us-gaap	Utilities Operating Expense Maintenance UtilitiesOperatingExpenseMaintenance	21463000	USD
CY2016	us-gaap	Utilities Operating Expense Maintenance UtilitiesOperatingExpenseMaintenance	22993000	USD
CY2017	us-gaap	Utilities Operating Expense Maintenance UtilitiesOperatingExpenseMaintenance	22530000	USD
CY2015	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	67248000	USD
CY2016	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	80082000	USD
CY2016	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	23231000	USD
CY2017	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	24797000	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47880000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47956000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48009000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48009000	shares
CY2016Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	6460000	USD
CY2017Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	6640000	USD

Files In Submission

Name	View Source	Status
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cwt-20171231.xsd	Edgar Link	pending
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cwt-20171231xex21.htm	Edgar Link	pending
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$CWT
CALIFORNIA WATER SERVICE GROUP Stock $cwt

2016 Q4 Form 10-K Financial Statement

#000103520118000003 Filed on March 01, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CWT CALIFORNIA WATER SERVICE GROUP Stock $cwt

2016 Q4 Form 10-K Financial Statement

#000103520118000003 Filed on March 01, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CWT
CALIFORNIA WATER SERVICE GROUP Stock $cwt