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Segment Reporting - Reconcilliation of Segment Data to the Consolidated Financial Statements (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting [Abstract]      
Operating (loss) income $ (98,874)us-gaap_OperatingIncomeLoss $ (15,672)us-gaap_OperatingIncomeLoss $ 39,796us-gaap_OperatingIncomeLoss
Interest expense, net (40,548)us-gaap_InterestIncomeExpenseNet (40,542)us-gaap_InterestIncomeExpenseNet (41,090)us-gaap_InterestIncomeExpenseNet
Interest expense - unrealized loss on debt conversion option 0cas_UnrealizedLossOnDebtConversionOption 0cas_UnrealizedLossOnDebtConversionOption (15,597)cas_UnrealizedLossOnDebtConversionOption
Loss on extinguishment of debt 0us-gaap_GainsLossesOnExtinguishmentOfDebt (2,606)us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt
Other Nonoperating (Expense) Income (4,323)us-gaap_OtherNonoperatingIncomeExpense (1,924)us-gaap_OtherNonoperatingIncomeExpense 1,349us-gaap_OtherNonoperatingIncomeExpense
Loss before income taxes and equity in earnings of joint venture (143,745)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (60,744)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (15,542)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Equity in earnings of joint venture 7,691us-gaap_IncomeLossFromEquityMethodInvestments 6,987us-gaap_IncomeLossFromEquityMethodInvestments 7,224us-gaap_IncomeLossFromEquityMethodInvestments
Consolidated loss before income taxes $ (136,054)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest $ (53,757)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest $ (8,318)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest