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Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Statement [Abstract] |  |  |
Operating revenue | $ 319,668us-gaap_RegulatedOperatingRevenue | $ 276,869us-gaap_RegulatedOperatingRevenue | $ 261,547us-gaap_RegulatedOperatingRevenue
Production Expenses: |  |  |
Purchased water | 47,280us-gaap_CostOfPurchasedWater | 63,225us-gaap_CostOfPurchasedWater | 66,106us-gaap_CostOfPurchasedWater
Power | 9,865us-gaap_UtilitiesOperatingExpensePurchasedPower | 7,619us-gaap_UtilitiesOperatingExpensePurchasedPower | 5,796us-gaap_UtilitiesOperatingExpensePurchasedPower
Groundwater extraction charges | 53,678sjw_GroundwaterExtractionCharges | 37,927sjw_GroundwaterExtractionCharges | 23,940sjw_GroundwaterExtractionCharges
Other production expenses | 11,929us-gaap_UtilitiesOperatingExpenseOther | 12,073us-gaap_UtilitiesOperatingExpenseOther | 11,445us-gaap_UtilitiesOperatingExpenseOther
Total production expenses | 122,752us-gaap_WaterProductionCosts | 120,844us-gaap_WaterProductionCosts | 107,287us-gaap_WaterProductionCosts
Administrative and general | 40,573us-gaap_GeneralAndAdministrativeExpense | 43,714us-gaap_GeneralAndAdministrativeExpense | 42,812us-gaap_GeneralAndAdministrativeExpense
Maintenance | 14,474us-gaap_UtilitiesOperatingExpenseMaintenance | 13,548us-gaap_UtilitiesOperatingExpenseMaintenance | 13,350us-gaap_UtilitiesOperatingExpenseMaintenance
Property taxes and other non-income taxes | 11,086us-gaap_UtilitiesOperatingExpenseTaxes | 10,317us-gaap_UtilitiesOperatingExpenseTaxes | 9,703us-gaap_UtilitiesOperatingExpenseTaxes
Depreciation and amortization | 37,905us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization | 35,039us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization | 33,098us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
Total operating expense | 226,790us-gaap_UtilitiesOperatingExpense | 223,462us-gaap_UtilitiesOperatingExpense | 206,250us-gaap_UtilitiesOperatingExpense
Operating income | 92,878us-gaap_OperatingIncomeLoss | 53,407us-gaap_OperatingIncomeLoss | 55,297us-gaap_OperatingIncomeLoss
Other (expense) income: |  |  |
Interest on long-term debt | (19,423)us-gaap_InterestExpenseDebt | (18,667)us-gaap_InterestExpenseDebt | (18,662)us-gaap_InterestExpenseDebt
Mortgage and other interest expense | (1,365)us-gaap_InterestExpenseOther | (1,255)us-gaap_InterestExpenseOther | (1,523)us-gaap_InterestExpenseOther
Gain on sale of California Water Service Group stock | 2,017us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Gain on sale of real estate investment | 554us-gaap_GainLossOnSaleOfProperties | 1,063us-gaap_GainLossOnSaleOfProperties | 910us-gaap_GainLossOnSaleOfProperties
Dividend income | 189us-gaap_InvestmentIncomeDividend | 246us-gaap_InvestmentIncomeDividend | 243us-gaap_InvestmentIncomeDividend
Other, net | 1,927us-gaap_OtherNonoperatingIncomeExpense | 1,725us-gaap_OtherNonoperatingIncomeExpense | 1,595us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes | 76,777us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 36,519us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 37,860us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes | 24,971us-gaap_IncomeTaxExpenseBenefit | 14,135us-gaap_IncomeTaxExpenseBenefit | 15,542us-gaap_IncomeTaxExpenseBenefit
Net income | 51,806us-gaap_NetIncomeLoss | 22,384us-gaap_NetIncomeLoss | 22,318us-gaap_NetIncomeLoss
Other comprehensive income: |  |  |
Unrealized income on investment, net of taxes of $208 in 2014, $741 in 2013 and $0 in 2012 | 301us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 1,077us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 36us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustment for gain realized on investment, net of taxes of $805 in 2014 | 1,171us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Comprehensive income | $ 50,936us-gaap_ComprehensiveIncomeNetOfTax | $ 23,461us-gaap_ComprehensiveIncomeNetOfTax | $ 22,354us-gaap_ComprehensiveIncomeNetOfTax
Earnings per share |  |  |
—Basic (in dollars per share) | $ 2.56us-gaap_EarningsPerShareBasic | $ 1.13us-gaap_EarningsPerShareBasic | $ 1.20us-gaap_EarningsPerShareBasic
—Diluted (in dollars per share) | $ 2.54us-gaap_EarningsPerShareDiluted | $ 1.12us-gaap_EarningsPerShareDiluted | $ 1.18us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding |  |  |
—Basic (shares) | 20,227,297us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 19,774,589us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 18,635,206us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
—Diluted (shares) | 20,416,734us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,971,236us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 18,839,231us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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