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Income Taxes (Details 6) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2013
Operating loss carryforwards |  |  |  |
Foreign tax credit carryforwards available to offset future payments | $ 136,864,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | $ 136,864,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | $ 124,850,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | $ 124,850,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Alternative minimum tax credit carryforwards available to offset future payments | 5,685,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 5,685,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 5,615,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 5,615,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Income taxes |  |  |  |
Change in ownership percentage, minimum | 50.00%exh_OperatingLossAndTaxCreditCarryforwardsLimitationsOnUseMinimumChangeInOwnershipPercentage |  |  |
Period of ownership percentage change | 3 years |  |  |
U.S. federal |  |  |  |
Operating loss carryforwards |  |  |  |
Net operating loss carryforward | 93,300,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember | 93,300,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |
Income taxes |  |  |  |
Valuation allowance recorded against deferred tax asset |  | 7,200,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |
Foreign tax credit carryforward period | 10 years |  |  |
Foreign |  |  |  |
Operating loss carryforwards |  |  |  |
Net operating loss carryforward | 360,000,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | 360,000,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |
Net operating loss carryforwards, not subject to expiration | 205,400,000 exh_OperatingLossCarryForwardsNotSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | 205,400,000 exh_OperatingLossCarryForwardsNotSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |
Net operating loss carryforwards, subject to expiration | 44,100,000 exh_OperatingLossCarryforwardsSubjectToExpirationInFiveYears / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | 44,100,000 exh_OperatingLossCarryforwardsSubjectToExpirationInFiveYears / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |
Income taxes |  |  |  |
Cumulative earnings generated by non-U.S. subsidiaries | 705,400,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | 705,400,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |
Foreign | Italy |  |  |  |
Income taxes |  |  |  |
Valuation allowance recorded against deferred tax asset |  |  | 9,000,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_IT |
Minimum taxable income for realization of deferred tax asset |  |  |  | $ 40,000,000 exh_MinimumTaxableIncomeRequiredToBeGeneratedForCompleteRealizationOfDeferredTaxAsset / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_IT

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