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Stock-based Compensation (Details) (Equity Incentive Plan, USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Compensation expense    
Recorded compensation costs for the RSAs and RSUs $ 0.6us-gaap_AllocatedShareBasedCompensationExpense $ 0.5us-gaap_AllocatedShareBasedCompensationExpense
Restricted Stock Awards (RSAs)
   
Stock-based Compensation    
Awards granted (in shares) 59,151us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
58,378us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
Awards cancelled (in shares) 5,193us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
 
Weighted average grant date fair value (in dollars per share) $ 24.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
$ 23.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
Restricted Stock Awards (RSAs) | Employees
   
Stock-based Compensation    
Vesting period 36 months 36 months
Restricted Stock Awards (RSAs) | Director
   
Stock-based Compensation    
Vesting period 12 months  
Restricted Stock Unit Award (RSUs) | Officer
   
Stock-based Compensation    
Awards granted (in shares) 37,137us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
37,143us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
Expiration period of award 3 years 3 years
Weighted average grant date fair value (in dollars per share) $ 24.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
$ 23.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
Restricted Stock Unit Award (RSUs) | Officer | Minimum
   
Stock-based Compensation    
Options vested on anniversary date (as a percent) 0.00%cwt_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
 
Restricted Stock Unit Award (RSUs) | Officer | Maximum
   
Stock-based Compensation    
Options vested on anniversary date (as a percent) 200.00%cwt_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember