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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Significant Other Observable Inputs (Level 2) | Recurring basis      
Fair value measurement of assets and liabilities      
Interest rate swaps asset   $ 712us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Interest rate swaps liability (8,885)us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
(5,108)us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Significant Unobservable Inputs (Level 3) | Nonrecurring basis      
Fair value measurement of assets and liabilities      
Impaired long-lived assets 744exh_LongLivedAssetImpairmentFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
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  368exh_LongLivedAssetImpairmentFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
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Inventory write-down - Restructuring     2,331exh_InventoryWriteDownOnRestructuringFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
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Long-term receivable from the sale of Canadian Operations $ 5,100exh_LongTermReceivableFromSaleOfDiscontinuedOperationsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
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