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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Utility plant:    
Land $ 42,181us-gaap_PublicUtilitiesPropertyPlantAndEquipmentLand $ 42,208us-gaap_PublicUtilitiesPropertyPlantAndEquipmentLand
Depreciable plant and equipment 2,191,194us-gaap_PublicUtilitiesPropertyPlantAndEquipmentEquipment 2,043,414us-gaap_PublicUtilitiesPropertyPlantAndEquipmentEquipment
Construction work in progress 90,328us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress 109,474us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
Intangible assets 18,768us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment 18,232us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment
Total utility plant 2,342,471us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService 2,213,328us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Less accumulated depreciation and amortization (752,040)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation (697,497)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Net utility plant 1,590,431us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet 1,515,831us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet
Current assets:    
Cash and cash equivalents 19,587us-gaap_CashAndCashEquivalentsAtCarryingValue 27,506us-gaap_CashAndCashEquivalentsAtCarryingValue
Receivables: net of allowance for doubtful accounts of $697 and $668 in 2014 and 2013, respectively    
Customers 25,803us-gaap_AccountsReceivableNetCurrent 31,468us-gaap_AccountsReceivableNetCurrent
Regulatory balancing accounts 53,199us-gaap_RegulatoryAssetsCurrent 30,887us-gaap_RegulatoryAssetsCurrent
Other 14,136us-gaap_NontradeReceivablesCurrent 18,700us-gaap_NontradeReceivablesCurrent
Unbilled revenue 23,740us-gaap_ReceivablesLongTermContractsOrPrograms 17,034us-gaap_ReceivablesLongTermContractsOrPrograms
Materials and supplies at weighted average cost 6,041us-gaap_PublicUtilitiesInventory 5,571us-gaap_PublicUtilitiesInventory
Taxes, prepaid expenses, and other assets 11,618cwt_TaxesPrepaidExpensesAndOtherAssetsCurrent 8,324cwt_TaxesPrepaidExpensesAndOtherAssetsCurrent
Total current assets 154,124us-gaap_AssetsCurrent 139,490us-gaap_AssetsCurrent
Other assets:    
Regulatory assets 390,331us-gaap_RegulatoryAssetsNoncurrent 251,681us-gaap_RegulatoryAssetsNoncurrent
Unamortized debt premium and expense 4,640us-gaap_UnamortizedDebtIssuanceExpense 5,114us-gaap_UnamortizedDebtIssuanceExpense
Goodwill 2,615us-gaap_Goodwill 2,615us-gaap_Goodwill
Other 45,210us-gaap_OtherAssetsNoncurrent 45,124us-gaap_OtherAssetsNoncurrent
Total other assets 442,796cwt_TotalOtherAssets 304,534cwt_TotalOtherAssets
Total assets 2,187,351us-gaap_Assets 1,959,855us-gaap_Assets
Capitalization:    
Common stock, $0.01 par value; 68,000 shares authorized, 47,806 and 47,741, outstanding in 2014 and 2013, respectively 478us-gaap_CommonStockValue 477us-gaap_CommonStockValue
Additional paid-in capital 330,558us-gaap_AdditionalPaidInCapitalCommonStock 328,364us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 295,590us-gaap_RetainedEarningsAccumulatedDeficit 269,915us-gaap_RetainedEarningsAccumulatedDeficit
Total common stockholders' equity 626,626us-gaap_StockholdersEquity 598,756us-gaap_StockholdersEquity
Long-term debt, less current maturities 419,233us-gaap_LongTermDebtNoncurrent 426,142us-gaap_LongTermDebtNoncurrent
Total capitalization 1,045,859us-gaap_CapitalizationLongtermDebtAndEquity 1,024,898us-gaap_CapitalizationLongtermDebtAndEquity
Current liabilities:    
Current maturities of long-term debt 6,607us-gaap_LongTermDebtCurrent 7,908us-gaap_LongTermDebtCurrent
Short-term borrowings 79,115us-gaap_ShortTermBorrowings 46,815us-gaap_ShortTermBorrowings
Accounts payable 59,395us-gaap_AccountsPayableCurrent 55,087us-gaap_AccountsPayableCurrent
Regulatory balancing accounts 6,126us-gaap_RegulatoryLiabilityCurrent 1,827us-gaap_RegulatoryLiabilityCurrent
Accrued other taxes 4,059us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 3,575us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Accrued interest 4,194us-gaap_InterestPayableCurrent 4,245us-gaap_InterestPayableCurrent
Other accrued liabilities 58,210us-gaap_AccruedLiabilitiesAndOtherLiabilities 47,127us-gaap_AccruedLiabilitiesAndOtherLiabilities
Total current liabilities 217,706us-gaap_LiabilitiesCurrent 166,584us-gaap_LiabilitiesCurrent
Unamortized investment tax credits 2,032us-gaap_AccumulatedDeferredInvestmentTaxCredit 2,106us-gaap_AccumulatedDeferredInvestmentTaxCredit
Deferred income taxes 214,842us-gaap_DeferredTaxLiabilitiesNoncurrent 183,245us-gaap_DeferredTaxLiabilitiesNoncurrent
Regulatory liabilities 36,447us-gaap_RegulatoryLiabilityNoncurrent 34,251us-gaap_RegulatoryLiabilityNoncurrent
Pension and postretirement benefits other than pensions 270,865us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent 145,451us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent
Advances for construction 182,284us-gaap_CustomerAdvancesForConstruction 183,393us-gaap_CustomerAdvancesForConstruction
Contributions in aid of construction 170,484us-gaap_ContributionsInAidOfConstruction 167,723us-gaap_ContributionsInAidOfConstruction
Other long-term liabilities 46,832us-gaap_OtherLiabilitiesNoncurrent 52,204us-gaap_OtherLiabilitiesNoncurrent
Commitments and contingencies      
Total capitalization and liabilities $ 2,187,351us-gaap_LiabilitiesAndStockholdersEquity $ 1,959,855us-gaap_LiabilitiesAndStockholdersEquity