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Accounting for Derivatives (Details 2) (Designated as a hedging instrument, Interest rate hedges, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value Asset (Liability)    
Total derivatives $ (8,885)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet $ (4,396)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Intangible and other assets, net
   
Fair Value Asset (Liability)    
Interest rate hedges   712us-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)    
Interest rate hedges (6,138)us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
(4,958)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)    
Interest rate hedges $ (2,747)us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
$ (150)us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember