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Accounting for Derivatives (Details 2) (Designated as a hedging instrument, Interest rate hedges, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value Asset (Liability)    
Total derivatives, Fair value $ (4,396)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet $ (3,052)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Intangible and other assets, net
   
Fair Value Asset (Liability)    
Derivatives asset designated as hedging instruments, Fair value 712us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement
/ us-gaap_BalanceSheetLocationAxis
= exh_IntangibleAndOtherAssetsNetMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
322us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement
/ us-gaap_BalanceSheetLocationAxis
= exh_IntangibleAndOtherAssetsNetMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Accrued liabilities
   
Fair Value Asset (Liability)    
Derivatives liability designated as hedging instruments, Fair value (4,958)us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
(3,374)us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Other long-term liabilities
   
Fair Value Asset (Liability)    
Derivatives liability designated as hedging instruments, Fair value $ (150)us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember