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EMPLOYEE BENEFIT PLANS (Details 2)
Dec. 31, 2014
S&P Index  
Employee benefit plans  
Performance benchmark of special index (as a percent) 35.00%cwt_DefinedBenefitPlanPerformancePercentageBenchmark
/ cwt_DefinedBenefitPlanByIndexCategoriesAxis
= cwt_StandardAndPoorsIndexMember
Russell 2000 Index  
Employee benefit plans  
Performance benchmark of special index (as a percent) 15.00%cwt_DefinedBenefitPlanPerformancePercentageBenchmark
/ cwt_DefinedBenefitPlanByIndexCategoriesAxis
= cwt_Russell2000IndexMember
MSCI EAFE Index  
Employee benefit plans  
Performance benchmark of special index (as a percent) 10.00%cwt_DefinedBenefitPlanPerformancePercentageBenchmark
/ cwt_DefinedBenefitPlanByIndexCategoriesAxis
= cwt_MorganStanleyCapitalInternationalEuropeAustralasiaAndFarEastIndexMember
Lehman Aggregate Bond Index  
Employee benefit plans  
Performance benchmark of special index (as a percent) 40.00%cwt_DefinedBenefitPlanPerformancePercentageBenchmark
/ cwt_DefinedBenefitPlanByIndexCategoriesAxis
= cwt_LehmanBrothersAggregateBondIndexMember