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Performance Share Status (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 3,450us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Long-Term Compensation Plan - 2014 [Member] | Non-Market-Based Performance Condition One      
Summary of award information associated with market and non-market-based performance condition awards      
Grant Date Fair Value $ 14.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cas_NonMarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2014Member		    
Estimated Number of Performance Shares to be Issued 0cas_ShareBasedCompensationArrangementsPerformanceBasedAwardsSharesEstimatedToBeIssued
/ us-gaap_AwardTypeAxis
= cas_NonMarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2014Member		    
Maximum Number of Performance Shares that could Potentially be Issued 170us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= cas_NonMarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2014Member		    
Long-Term Compensation Plan - 2014 [Member] | Market Based Performance Share Units [Member]      
Summary of award information associated with market and non-market-based performance condition awards      
Grant Date Fair Value $ 20.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cas_MarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2014Member		    
Estimated Number of Performance Shares to be Issued 0cas_ShareBasedCompensationArrangementsPerformanceBasedAwardsSharesEstimatedToBeIssued
/ us-gaap_AwardTypeAxis
= cas_MarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2014Member		    
Maximum Number of Performance Shares that could Potentially be Issued 170us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= cas_MarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2014Member		    
Long-Term Compensation Plan - 2012 | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Long-Term Compensation Plan, Target Goals 3 years    
Long-Term Compensation Plan - 2012 | Non-Market-Based Performance Condition One      
Summary of award information associated with market and non-market-based performance condition awards      
Grant Date Fair Value   $ 10.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cas_NonMarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2012Member		  
Estimated Number of Performance Shares to be Issued 0cas_ShareBasedCompensationArrangementsPerformanceBasedAwardsSharesEstimatedToBeIssued
/ us-gaap_AwardTypeAxis
= cas_NonMarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2012Member		    
Maximum Number of Performance Shares that could Potentially be Issued 106us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= cas_NonMarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2012Member		    
Long-Term Compensation Plan - 2012 | Market Based Performance Share Units [Member]      
Summary of award information associated with market and non-market-based performance condition awards      
Grant Date Fair Value   $ 13.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cas_MarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2012Member		  
Estimated Number of Performance Shares to be Issued 0cas_ShareBasedCompensationArrangementsPerformanceBasedAwardsSharesEstimatedToBeIssued
/ us-gaap_AwardTypeAxis
= cas_MarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2012Member		    
Maximum Number of Performance Shares that could Potentially be Issued 106us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= cas_MarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2012Member		    
Long-Term Compensation Plan - 2012 | Market Based Performance Share Units, CEO Grant [Member]      
Summary of award information associated with market and non-market-based performance condition awards      
Grant Date Fair Value   $ 16.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cas_MarketBasedPerformanceShareUnitsCEOGrantMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2012Member		 [1]  
Estimated Number of Performance Shares to be Issued 0cas_ShareBasedCompensationArrangementsPerformanceBasedAwardsSharesEstimatedToBeIssued
/ us-gaap_AwardTypeAxis
= cas_MarketBasedPerformanceShareUnitsCEOGrantMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2012Member		 [1]    
Maximum Number of Performance Shares that could Potentially be Issued 58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= cas_MarketBasedPerformanceShareUnitsCEOGrantMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2012Member		 [1]    
Long-Term Compensation Plan - 2012 | Non Market Based Performance Share Units, CEO Grant [Member]      
Summary of award information associated with market and non-market-based performance condition awards      
Grant Date Fair Value   $ 12.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cas_NonMarketBasedPerformanceShareUnitsCEOGrantMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2012Member		 [1]  
Estimated Number of Performance Shares to be Issued 0cas_ShareBasedCompensationArrangementsPerformanceBasedAwardsSharesEstimatedToBeIssued
/ us-gaap_AwardTypeAxis
= cas_NonMarketBasedPerformanceShareUnitsCEOGrantMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2012Member		 [1]    
Maximum Number of Performance Shares that could Potentially be Issued 58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= cas_NonMarketBasedPerformanceShareUnitsCEOGrantMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2012Member		 [1]    
Long-Term Compensation Plan - 2013 [Member] | Non-Market-Based Performance Condition One      
Summary of award information associated with market and non-market-based performance condition awards      
Grant Date Fair Value     $ 16.29us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cas_NonMarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2013Member
Estimated Number of Performance Shares to be Issued 0cas_ShareBasedCompensationArrangementsPerformanceBasedAwardsSharesEstimatedToBeIssued
/ us-gaap_AwardTypeAxis
= cas_NonMarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2013Member		    
Maximum Number of Performance Shares that could Potentially be Issued 120us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= cas_NonMarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2013Member		    
Long-Term Compensation Plan - 2013 [Member] | Market Based Performance Share Units [Member]      
Summary of award information associated with market and non-market-based performance condition awards      
Grant Date Fair Value     $ 24.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cas_MarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2013Member
Estimated Number of Performance Shares to be Issued 0cas_ShareBasedCompensationArrangementsPerformanceBasedAwardsSharesEstimatedToBeIssued
/ us-gaap_AwardTypeAxis
= cas_MarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2013Member		    
Maximum Number of Performance Shares that could Potentially be Issued 120us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= cas_MarketBasedPerformanceShareUnitsMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlan2013Member		    
Long-Term Compensation Plans 2014 and 2013 | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 1,456us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= cas_LongTermCompensationPlans2014and2013Member		    
[1] Represents PSU awards granted in October 2012 under the 2012 LTC Plan.