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Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2014
Dec. 31, 2011
Deferred tax assets:          
Pension and postretirement benefits $ 4,714us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits $ 2,526us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits      
Deferred compensation 2,109us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,768us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost      
Restructuring Related and Other Reserves 943cas_DeferedTaxAssetsRestructuringRelatedandOtherReserves 1,055cas_DeferedTaxAssetsRestructuringRelatedandOtherReserves      
Alternative minimum tax and net operating loss carryforward 40,787us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 24,072us-gaap_DeferredTaxAssetsOperatingLossCarryforwards      
Deferred Tax Assets, Inventory 5,218us-gaap_DeferredTaxAssetsInventory 0us-gaap_DeferredTaxAssetsInventory      
Other, net 1,833us-gaap_DeferredTaxAssetsOther 69us-gaap_DeferredTaxAssetsOther      
Deferred tax assets before valuation allowance 55,604us-gaap_DeferredTaxAssetsGross 29,490us-gaap_DeferredTaxAssetsGross      
Deferred Tax Assets, Valuation Allowance (33,021)us-gaap_DeferredTaxAssetsValuationAllowance 0us-gaap_DeferredTaxAssetsValuationAllowance      
Deferred Tax Assets, Net of Valuation Allowance 22,583us-gaap_DeferredTaxAssetsNet 29,490us-gaap_DeferredTaxAssetsNet      
Deferred tax liabilities:          
Depreciation 9,857us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 8,026us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment      
Inventory 0us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts 319us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts      
Pension 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 5,954us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions      
Intangible assets and goodwill 9,129us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets 13,288us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets      
Deferred tax liabilities, debt discount 5,644us-gaap_DeferredTaxLiabilitiesFinancingArrangements 6,833us-gaap_DeferredTaxLiabilitiesFinancingArrangements      
Other, net 5,628us-gaap_DeferredTaxLiabilitiesOther 2,561us-gaap_DeferredTaxLiabilitiesOther      
Total deferred tax liabilities 30,258us-gaap_DeferredIncomeTaxLiabilities 36,981us-gaap_DeferredIncomeTaxLiabilities      
Net deferred tax liabilities 7,675us-gaap_DeferredTaxLiabilities 7,491us-gaap_DeferredTaxLiabilities      
United States          
Valuation Allowance [Line Items]          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 28,133us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= country_US
       
Deferred tax assets:          
Deferred Tax Assets, Valuation Allowance (28,133)us-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
United States | Tax provision [Domain]          
Valuation Allowance [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
   
United States | Accumulated Other Comprehensive Income (Loss) [Member]          
Valuation Allowance [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
   
Segment, Geographical, Non-U.S. [Member]          
Valuation Allowance [Line Items]          
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
   
Deferred tax assets:          
Deferred Tax Assets, Valuation Allowance (4,888)us-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
Segment, Geographical, Non-U.S. [Member] | Valuation Allowance, Operating Loss Carryforwards [Member]          
Valuation Allowance [Line Items]          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 2,148us-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