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Income Taxes - Narrative (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended 3 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Feb. 29, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2014
Dec. 31, 2011
Tax Credit Carryforward [Line Items]                
Deferred Tax Assets, Valuation Allowance       $ 33,021us-gaap_DeferredTaxAssetsValuationAllowance $ 0us-gaap_DeferredTaxAssetsValuationAllowance      
Statuatory federal rate       35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate        
Unrecognized Tax Benefits that Would Impact Effective Tax Rate       0us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 105us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 105us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound       0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound        
Unrecognized Tax Benefits Period of Estimated Change       12 months        
Federal income tax refund 1,500us-gaap_ProceedsFromIncomeTaxRefunds 2,590us-gaap_ProceedsFromIncomeTaxRefunds 2,025us-gaap_ProceedsFromIncomeTaxRefunds 2,284us-gaap_ProceedsFromIncomeTaxRefunds 3,015us-gaap_ProceedsFromIncomeTaxRefunds 3,184us-gaap_ProceedsFromIncomeTaxRefunds    
Foreign Tax Authority                
Tax Credit Carryforward [Line Items]                
Returns filed       7cas_NumberOfReturnsFiled
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
       
State and Local Jurisdiction                
Tax Credit Carryforward [Line Items]                
Returns filed       33cas_NumberOfReturnsFiled
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
       
Segment, Geographical, Non-U.S. [Member]                
Tax Credit Carryforward [Line Items]                
Deferred Tax Assets, Valuation Allowance       4,888us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_StatementGeographicalAxis
= cas_SegmentGeographicalNonU.S.Member
0us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_StatementGeographicalAxis
= cas_SegmentGeographicalNonU.S.Member
0us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_StatementGeographicalAxis
= cas_SegmentGeographicalNonU.S.Member
  0us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_StatementGeographicalAxis
= cas_SegmentGeographicalNonU.S.Member
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount       4,888us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= cas_SegmentGeographicalNonU.S.Member
0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= cas_SegmentGeographicalNonU.S.Member
0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= cas_SegmentGeographicalNonU.S.Member
   
United States                
Tax Credit Carryforward [Line Items]                
Deferred Tax Assets, Valuation Allowance       28,133us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_StatementGeographicalAxis
= country_US
0us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_StatementGeographicalAxis
= country_US
0us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_StatementGeographicalAxis
= country_US
  0us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_StatementGeographicalAxis
= country_US
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount       28,133us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= country_US
       
Tax provision [Domain] | United States                
Tax Credit Carryforward [Line Items]                
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount       19,684us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= country_US
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= cas_TaxprovisionDomain
0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= country_US
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= cas_TaxprovisionDomain
0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= country_US
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= cas_TaxprovisionDomain
   
Valuation Allowance, Operating Loss Carryforwards [Member] | Segment, Geographical, Non-U.S. [Member]                
Tax Credit Carryforward [Line Items]                
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount       2,148us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= cas_SegmentGeographicalNonU.S.Member
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember
    2,740us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= cas_SegmentGeographicalNonU.S.Member
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember
 
Accumulated Other Comprehensive Income (Loss) [Member] | United States                
Tax Credit Carryforward [Line Items]                
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount       $ 8,449us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= country_US
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= country_US
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= country_US
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember