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STOCK-BASED COMPENSATION PLANS (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Apr. 27, 2005
STOCK-BASED COMPENSATION PLANS      
Number of stockholder-approved stock-based compensation plans 1cwt_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfStockBasedCompensationPlans    
Equity Incentive Plan      
Stock-based Compensation      
Shares authorized to be issued under the plan     2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
Compensation expense      
Recorded compensation costs for the RSAs and RSUs $ 2.2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
$ 1.8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
 
Equity Incentive Plan | Restricted Stock Awards (RSAs)      
Stock-based Compensation      
Awards granted (in shares) 60,467us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
74,824us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
 
Awards cancelled (in shares) 10,544us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
 
Weighted average grant date fair value (in dollars per share) $ 23.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
$ 20.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
 
Equity Incentive Plan | Restricted Stock Awards (RSAs) | Director      
Stock-based Compensation      
Vesting period 12 months    
Equity Incentive Plan | Restricted Stock Awards (RSAs) | Employees      
Stock-based Compensation      
Cliff vesting period 1 year    
Vesting period 36 months 48 months  
Equity Incentive Plan | Restricted Stock Unit Award (RSUs)      
Stock-based Compensation      
Expiration period of award 3 years    
Equity Incentive Plan | Restricted Stock Unit Award (RSUs) | Officer      
Stock-based Compensation      
Awards granted (in shares) 39,232us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
50,267us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
 
Weighted average grant date fair value (in dollars per share) $ 23.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
$ 20.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= cwt_EquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
 
Equity Incentive Plan | 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
   
Equity Incentive Plan | 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