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Derivative Instruments, Hedging Activities and Fair Value (Details 4) (Designated as hedging instrument, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Maturing 2018  
Derivatives Designated as Hedging Instruments  
Contractual Amount $ 250,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= hsc_CrossCurrencyInterestRateSwapMaturing2018Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Maturing 2020  
Derivatives Designated as Hedging Instruments  
Contractual Amount 220,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= hsc_CrossCurrencyInterestRateSwapMaturing2020Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Maturing 2016 through 2017  
Derivatives Designated as Hedging Instruments  
Contractual Amount $ 8,200invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= hsc_CrossCurrencyInterestRateSwapMaturing2013Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember