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Income Taxes - Narrative (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended
Oct. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate, Continuing Operations   (3.70%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (0.30%)us-gaap_EffectiveIncomeTaxRateContinuingOperations
Federal income tax refund received $ 1,500us-gaap_ProceedsFromIncomeTaxRefunds    
Segment, Geographical, Non-U.S. [Member]      
Valuation Allowance [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   675us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= cas_SegmentGeographicalNonU.S.Member
500us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= cas_SegmentGeographicalNonU.S.Member
Segment, Geographical, Non-U.S. [Member] | Valuation Allowance, Operating Loss Carryforwards [Member]      
Valuation Allowance [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     2,740us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= cas_SegmentGeographicalNonU.S.Member
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember
UNITED STATES      
Valuation Allowance [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   5,800us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= country_US
2,500us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= country_US