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<!-- Copyright (c) 2005-2012 R.R. Donnelley &amp; Sons Company All Rights Reserved. -->
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  <import namespace="http://fasb.org/us-gaap/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/country/2012-01-31" schemaLocation="http://xbrl.sec.gov/country/2012/country-2012-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/dei/2012-01-31" schemaLocation="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/invest/2012-01-31" schemaLocation="http://xbrl.sec.gov/invest/2012/invest-2012-01-31.xsd"/>
  <element name="AccountsReceivableNumberOfDaysPastDueEvaluatedForDoubtfulAccounts" id="aepi_AccountsReceivableNumberOfDaysPastDueEvaluatedForDoubtfulAccounts" type="xbrli:positiveIntegerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AccrualForPerformanceUnitsCurrent" id="aepi_AccrualForPerformanceUnitsCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AccruedExpensesTable" id="aepi_AccruedExpensesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTax" id="aepi_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTax" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AdditionsOfFiniteLivedIntangibleAssetsFromAcquisitionsDuringYear" id="aepi_AdditionsOfFiniteLivedIntangibleAssetsFromAcquisitionsDuringYear" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AfterMember" id="aepi_AfterMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AggregateIntrinsicValueAbstract" id="aepi_AggregateIntrinsicValueAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AlternativeMinimumTaxCreditCarryForwardsThatAreNotSubjectToLimitationOrExpiration" id="aepi_AlternativeMinimumTaxCreditCarryForwardsThatAreNotSubjectToLimitationOrExpiration" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AmendedAndRestatedCreditFacilityMember" id="aepi_AmendedAndRestatedCreditFacilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems" id="aepi_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable" id="aepi_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="BeforeMember" id="aepi_BeforeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionCostOfAcquiredEntityPurchasePriceSubjectToAdjustment" id="aepi_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceSubjectToAdjustment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionPurchasePriceAdjustment" id="aepi_BusinessAcquisitionPurchasePriceAdjustment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionPurchasePriceAllocationNetCurrentAssets" id="aepi_BusinessAcquisitionPurchasePriceAllocationNetCurrentAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionPurchasePriceAllocationNetIdentifiableAssetsAcquired" id="aepi_BusinessAcquisitionPurchasePriceAllocationNetIdentifiableAssetsAcquired" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionPurchasePriceAllocationOtherCurrentAssets" id="aepi_BusinessAcquisitionPurchasePriceAllocationOtherCurrentAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionPurchasePriceAllocationPensionLiability" id="aepi_BusinessAcquisitionPurchasePriceAllocationPensionLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionsProFormaOperatingIncomeLoss" id="aepi_BusinessAcquisitionsProFormaOperatingIncomeLoss" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionTable" id="aepi_BusinessAcquisitionTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="BusinessAcquisitionTransactionRelatedCost" id="aepi_BusinessAcquisitionTransactionRelatedCost" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessCombinationBargainPurchaseGainRecognizedPreliminaryAndFinal" id="aepi_BusinessCombinationBargainPurchaseGainRecognizedPreliminaryAndFinal" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CanadaChMember" id="aepi_CanadaChMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CanadaMember" id="aepi_CanadaMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CapitalLeaseInterestPaid" id="aepi_CapitalLeaseInterestPaid" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CapitalLeaseMember" id="aepi_CapitalLeaseMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CapitalLossCarryforwardExpirationDate" id="aepi_CapitalLossCarryforwardExpirationDate" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CapitalLossCarryforwards" id="aepi_CapitalLossCarryforwards" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CapitalLossCarryforwardsExpired" id="aepi_CapitalLossCarryforwardsExpired" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CapitalLossCarryforwardWithoutExpirationDate" id="aepi_CapitalLossCarryforwardWithoutExpirationDate" type="xbrli:normalizedStringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CashEquivalentsMaturityPeriodOfHighlyLiquidInvestments" id="aepi_CashEquivalentsMaturityPeriodOfHighlyLiquidInvestments" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ChangeInLifoReserve" id="aepi_ChangeInLifoReserve" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ChelseaIndustriesMember" id="aepi_ChelseaIndustriesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommonStockCapitalSharesAvailableForIssuance" id="aepi_CommonStockCapitalSharesAvailableForIssuance" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommonStockTendered" id="aepi_CommonStockTendered" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CompensationCostsRelatedToStockOptionsCapitalizedInInventory" id="aepi_CompensationCostsRelatedToStockOptionsCapitalizedInInventory" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ComponentsOfAccumulatedOtherComprehensiveIncomeLineItems" id="aepi_ComponentsOfAccumulatedOtherComprehensiveIncomeLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ComponentsOfAccumulatedOtherComprehensiveIncomeTable" id="aepi_ComponentsOfAccumulatedOtherComprehensiveIncomeTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ComprehensiveIncomeLoss" id="aepi_ComprehensiveIncomeLoss" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ContingenciesAndCommitmentsLineItems" id="aepi_ContingenciesAndCommitmentsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ContingenciesAndCommitmentsTable" id="aepi_ContingenciesAndCommitmentsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="CostOfSales" id="aepi_CostOfSales" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CreditFacilitiesMember" id="aepi_CreditFacilitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CreditFacilityBorrowingBase" id="aepi_CreditFacilityBorrowingBase" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CreditFacilitySecuredByCompanysOwnershipInterestInCertainForeignSubsidiaries" id="aepi_CreditFacilitySecuredByCompanysOwnershipInterestInCertainForeignSubsidiaries" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CreditFacilityUnamortizedFees" id="aepi_CreditFacilityUnamortizedFees" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CustomerRebatesCurrent" id="aepi_CustomerRebatesCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentCollateralAmount" id="aepi_DebtInstrumentCollateralAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentDescriptionOfVariableRateBasisBorrowings" id="aepi_DebtInstrumentDescriptionOfVariableRateBasisBorrowings" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DecreaseInCostOfSalesDueToDecrements" id="aepi_DecreaseInCostOfSalesDueToDecrements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxAssetsAndLiabilitiesLineItems" id="aepi_DeferredTaxAssetsAndLiabilitiesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxAssetsAndLiabilitiesTable" id="aepi_DeferredTaxAssetsAndLiabilitiesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="DeferredTaxAssetsTaxCreditCarryForwardsForeignExpirationDate" id="aepi_DeferredTaxAssetsTaxCreditCarryForwardsForeignExpirationDate" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeferredTaxLiabilityDeferredGain" id="aepi_DeferredTaxLiabilityDeferredGain" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeTax" id="aepi_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeTax" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DefinedBenefitPlanFairValueOfPlanAssetsTableTextBlock" id="aepi_DefinedBenefitPlanFairValueOfPlanAssetsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DefinedBenefitPlansMember" id="aepi_DefinedBenefitPlansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostTableTextBlock" id="aepi_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DefinedContributionPlanEmployerContributionAsPercentageOfSalary" id="aepi_DefinedContributionPlanEmployerContributionAsPercentageOfSalary" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DefinedContributionPlanEmployerContributionMaximumPercentage" id="aepi_DefinedContributionPlanEmployerContributionMaximumPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DefinedContributionPlanEmployerMatchingAnnualContributionPercentageOfEligibleCompensationMaximum" id="aepi_DefinedContributionPlanEmployerMatchingAnnualContributionPercentageOfEligibleCompensationMaximum" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DefinedContributionPlanEmployerMatchingContributionPercentForThreePercentOfEmployeeContribution" id="aepi_DefinedContributionPlanEmployerMatchingContributionPercentForThreePercentOfEmployeeContribution" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DefinedContributionPlanEmployerMatchingContributionPercentForTwoPercentOfEmployeeContribution" id="aepi_DefinedContributionPlanEmployerMatchingContributionPercentForTwoPercentOfEmployeeContribution" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DefinedContributionPlanFourZeroOneKSavingsAndEmployeeStockOwnershipPlanMember" id="aepi_DefinedContributionPlanFourZeroOneKSavingsAndEmployeeStockOwnershipPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DefinedContributionPlanMember" id="aepi_DefinedContributionPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeliveryExpense" id="aepi_DeliveryExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAccruedExpensesAccruedExpensesAbstract" id="aepi_DisclosureAccruedExpensesAccruedExpensesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAccumulatedBalancesRelatedToComponentsOfAccumulatedOtherComprehensiveIncomeLossAbstract" id="aepi_DisclosureAccumulatedBalancesRelatedToComponentsOfAccumulatedOtherComprehensiveIncomeLossAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAccumulatedOtherComprehensiveIncomeAdditionalInformationAbstract" id="aepi_DisclosureAccumulatedOtherComprehensiveIncomeAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAcquisitionsAdditionalInformationAbstract" id="aepi_DisclosureAcquisitionsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAcquisitionsProFormaResultsOfOperationAbstract" id="aepi_DisclosureAcquisitionsProFormaResultsOfOperationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAcquisitionsSummaryOfAmountsRecognizedForAssetsAcquiredAndLiabilitiesAssumedAbstract" id="aepi_DisclosureAcquisitionsSummaryOfAmountsRecognizedForAssetsAcquiredAndLiabilitiesAssumedAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureCarryingValueAndFairValueOfCompanysFixedRateDebtAbstract" id="aepi_DisclosureCarryingValueAndFairValueOfCompanysFixedRateDebtAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract" id="aepi_DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureComponentsOfNetPeriodicPensionCostsAbstract" id="aepi_DisclosureComponentsOfNetPeriodicPensionCostsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureDebtAdditionalInformationAbstract" id="aepi_DisclosureDebtAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureDebtComponentsOfDebtAbstract" id="aepi_DisclosureDebtComponentsOfDebtAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureDebtPrincipalPaymentsRequiredOnDebtOutstandingAbstract" id="aepi_DisclosureDebtPrincipalPaymentsRequiredOnDebtOutstandingAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureDebtScheduleOfMinimumFutureLeasePaymentsOnCapitalizedLeasesAbstract" id="aepi_DisclosureDebtScheduleOfMinimumFutureLeasePaymentsOnCapitalizedLeasesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureDeferredTaxAssetsLiabilitiesAbstract" id="aepi_DisclosureDeferredTaxAssetsLiabilitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureEstimatedNetActuarialGainAndPriorServiceCostAbstract" id="aepi_DisclosureEstimatedNetActuarialGainAndPriorServiceCostAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureExpectedBenefitPaymentsAreBasedOnSameAssumptionsUsedToMeasureCompanyBenefitObligationAbstract" id="aepi_DisclosureExpectedBenefitPaymentsAreBasedOnSameAssumptionsUsedToMeasureCompanyBenefitObligationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureFairValueMeasurementsAndDerivativeInstrumentsAdditionalInformationAbstract" id="aepi_DisclosureFairValueMeasurementsAndDerivativeInstrumentsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureFairValuesByCategoryOfInputsAbstract" id="aepi_DisclosureFairValuesByCategoryOfInputsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIncomeTaxesAdditionalInformationAbstract" id="aepi_DisclosureIncomeTaxesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIncomeTaxesNetLossCarryforwardsForeignTaxCreditsAndAlternativeMinimumTaxCreditsBeforeValuationAllowancesAbstract" id="aepi_DisclosureIncomeTaxesNetLossCarryforwardsForeignTaxCreditsAndAlternativeMinimumTaxCreditsBeforeValuationAllowancesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIncomeTaxesReconciliationOfProvisionForIncomeTaxesOnIncomeFromContinuingOperationsAbstract" id="aepi_DisclosureIncomeTaxesReconciliationOfProvisionForIncomeTaxesOnIncomeFromContinuingOperationsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIntangibleAssetsChangesInCarryingAmountOfIntangibleAssetsAbstract" id="aepi_DisclosureIntangibleAssetsChangesInCarryingAmountOfIntangibleAssetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIntangibleAssetsEstimatedFutureAmortizationExpenseAbstract" id="aepi_DisclosureIntangibleAssetsEstimatedFutureAmortizationExpenseAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIntangibleAssetsWeightedAverageAmortizationPeriodOverStraightLineBasisAbstract" id="aepi_DisclosureIntangibleAssetsWeightedAverageAmortizationPeriodOverStraightLineBasisAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureInventoriesAdditionalInformationAbstract" id="aepi_DisclosureInventoriesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureInventoriesInventoriesAbstract" id="aepi_DisclosureInventoriesInventoriesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosurePensionsAndRetirementSavingsPlanAdditionalInformationAbstract" id="aepi_DisclosurePensionsAndRetirementSavingsPlanAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosurePropertyPlantAndEquipmentAdditionalInformationAbstract" id="aepi_DisclosurePropertyPlantAndEquipmentAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosurePropertyPlantAndEquipmentSummaryOfComponentsOfPropertyPlantAndEquipmentAbstract" id="aepi_DisclosurePropertyPlantAndEquipmentSummaryOfComponentsOfPropertyPlantAndEquipmentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureProvisionForIncomeTaxesFromContinuingOperationsAbstract" id="aepi_DisclosureProvisionForIncomeTaxesFromContinuingOperationsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureQuarterlyFinancialDataUnauditedAbstract" id="aepi_DisclosureQuarterlyFinancialDataUnauditedAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureQuarterlyFinancialDataUnauditedAdditionalInformationAbstract" id="aepi_DisclosureQuarterlyFinancialDataUnauditedAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureReconciliationOfChangeInBenefitObligationAbstract" id="aepi_DisclosureReconciliationOfChangeInBenefitObligationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureRelatedPartyTransactionsAdditionalInformationAbstract" id="aepi_DisclosureRelatedPartyTransactionsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfFutureMinimumRentalPaymentsOnOperatingLeasesAbstract" id="aepi_DisclosureScheduleOfFutureMinimumRentalPaymentsOnOperatingLeasesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureShareholdersEquityAdditionalInformationAbstract" id="aepi_DisclosureShareholdersEquityAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureShareholdersEquityTotalShareBasedCompensationExpenseRelatedToCompanysStockOptionPlansAbstract" id="aepi_DisclosureShareholdersEquityTotalShareBasedCompensationExpenseRelatedToCompanysStockOptionPlansAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureShareholdersEquityWeightedAverageAssumptionsUsedToCalculateFairValueOfStockOptionsGrantedAbstract" id="aepi_DisclosureShareholdersEquityWeightedAverageAssumptionsUsedToCalculateFairValueOfStockOptionsGrantedAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSignificantAccountingPoliciesAdditionalInformationAbstract" id="aepi_DisclosureSignificantAccountingPoliciesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSignificantAccountingPoliciesNumberOfSharesUsedInCalculatingBasicAndDilutedEarningsPerShareAbstract" id="aepi_DisclosureSignificantAccountingPoliciesNumberOfSharesUsedInCalculatingBasicAndDilutedEarningsPerShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSubsequentEventAdditionalInformationAbstract" id="aepi_DisclosureSubsequentEventAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSummaryOfCompanysStockOptionPlansAbstract" id="aepi_DisclosureSummaryOfCompanysStockOptionPlansAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSummaryOfNetSalesByProductLineAbstract" id="aepi_DisclosureSummaryOfNetSalesByProductLineAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSummaryOfNonVestedStockOptionsAbstract" id="aepi_DisclosureSummaryOfNonVestedStockOptionsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSummaryOfOperatingIncomeIncludesGeographicalAreaAbstract" id="aepi_DisclosureSummaryOfOperatingIncomeIncludesGeographicalAreaAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSummaryOfStockOptionActivityAbstract" id="aepi_DisclosureSummaryOfStockOptionActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSummaryOfStockRepurchaseProgramAbstract" id="aepi_DisclosureSummaryOfStockRepurchaseProgramAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSummaryOfUnitChangesAbstract" id="aepi_DisclosureSummaryOfUnitChangesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureUSAndForeignComponentsOfIncomeLossFromContinuingOperationsAbstract" id="aepi_DisclosureUSAndForeignComponentsOfIncomeLossFromContinuingOperationsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="DisclosureWeightedAverageAssumptionsUsedToDetermineCompanysBenefitObligationsAbstract" id="aepi_DisclosureWeightedAverageAssumptionsUsedToDetermineCompanysBenefitObligationsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureWeightedAverageAssumptionsUsedToDetermineCompanysNetPeriodicBenefitCostAbstract" id="aepi_DisclosureWeightedAverageAssumptionsUsedToDetermineCompanysNetPeriodicBenefitCostAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DocumentDocumentandEntityInformationAbstract" id="aepi_DocumentDocumentandEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EarlyRedemption" id="aepi_EarlyRedemption" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EarningsPerShareLineItems" id="aepi_EarningsPerShareLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EarningsPerShareTable" id="aepi_EarningsPerShareTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="EffectiveIncomeTaxRateReconciliationLineItems" id="aepi_EffectiveIncomeTaxRateReconciliationLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EffectiveIncomeTaxRateReconciliationTable" id="aepi_EffectiveIncomeTaxRateReconciliationTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="EightPointTwoFivePercentSeniorNotesDueTwoThousandNinetyMember" id="aepi_EightPointTwoFivePercentSeniorNotesDueTwoThousandNinetyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EmployeeStockPurchasePlanMember" id="aepi_EmployeeStockPurchasePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EntityWideRevenueCriteriaForMajorCustomerAsPercentageOfAccountsReceivable" id="aepi_EntityWideRevenueCriteriaForMajorCustomerAsPercentageOfAccountsReceivable" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquipmentFinancedThroughBuyoutOfOperatingLeaseDeposit" id="aepi_EquipmentFinancedThroughBuyoutOfOperatingLeaseDeposit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EstimatedAccruedWorkingCapitalTrueUpDueRelatedToAcquisition" id="aepi_EstimatedAccruedWorkingCapitalTrueUpDueRelatedToAcquisition" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExcessAvailabilityUnderCreditFacilityMaximumRange" id="aepi_ExcessAvailabilityUnderCreditFacilityMaximumRange" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExcessAvailabilityUnderCreditFacilityMinimumRange" id="aepi_ExcessAvailabilityUnderCreditFacilityMinimumRange" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExercisePriceOneMember" id="aepi_ExercisePriceOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExercisePriceTwoMember" id="aepi_ExercisePriceTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpensesForMaintenanceAndRepairs" id="aepi_ExpensesForMaintenanceAndRepairs" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
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  <element name="FairValueOfFinancialInstrumentsTable" id="aepi_FairValueOfFinancialInstrumentsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="FairValueOfInterestRateSwap" id="aepi_FairValueOfInterestRateSwap" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FederalTaxLiabilitiesOnDividends" id="aepi_FederalTaxLiabilitiesOnDividends" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FeesCapitalizedRelatedToAmendedAndRestatedCreditFacility" id="aepi_FeesCapitalizedRelatedToAmendedAndRestatedCreditFacility" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FifteenYearFixedRateFourPointSevenFivePercentLoanDueTwoThousandTwentyThreeMemberMember" id="aepi_FifteenYearFixedRateFourPointSevenFivePercentLoanDueTwoThousandTwentyThreeMemberMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FiscalYearPolicyTextBlock" id="aepi_FiscalYearPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FiveYearFixedRateFivePointZeroPercentLoanDueTwoThousandThirteenMemberMember" id="aepi_FiveYearFixedRateFivePointZeroPercentLoanDueTwoThousandThirteenMemberMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FixedChargeCoverageRatio" id="aepi_FixedChargeCoverageRatio" type="xbrli:pureItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FixedChargeCoverageRatioTrigger" id="aepi_FixedChargeCoverageRatioTrigger" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignBankBorrowingsCanadianSubsidiaryMember" id="aepi_ForeignBankBorrowingsCanadianSubsidiaryMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignBankBorrowingsMember" id="aepi_ForeignBankBorrowingsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignNetOperatingLossCarryforwards" id="aepi_ForeignNetOperatingLossCarryforwards" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignSubsidiaryCreditFacilityOutstandingAmount" id="aepi_ForeignSubsidiaryCreditFacilityOutstandingAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignTaxCredit" id="aepi_ForeignTaxCredit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignTaxCreditCarryforwards" id="aepi_ForeignTaxCreditCarryforwards" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForeignWithholdingTaxes" id="aepi_ForeignWithholdingTaxes" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GainLossOnInterestRateSwaps" id="aepi_GainLossOnInterestRateSwaps" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoodwillConsolidated" id="aepi_GoodwillConsolidated" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoodwillReductionDueToRealizationOfDeferredTaxAssets" id="aepi_GoodwillReductionDueToRealizationOfDeferredTaxAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxesLineItems" id="aepi_IncomeTaxesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxesPaidByDiscontinuedOperations" id="aepi_IncomeTaxesPaidByDiscontinuedOperations" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxesTable" id="aepi_IncomeTaxesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="IncomeTaxExpenseBenefitAfterBenefitOfFutureForeignTaxCredit" id="aepi_IncomeTaxExpenseBenefitAfterBenefitOfFutureForeignTaxCredit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxReconciliationCapitalLossesExpired" id="aepi_IncomeTaxReconciliationCapitalLossesExpired" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxReconciliationForeignNetOperatingLossesExpired" id="aepi_IncomeTaxReconciliationForeignNetOperatingLossesExpired" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxReconciliationNetTaxOnForeignDividend" id="aepi_IncomeTaxReconciliationNetTaxOnForeignDividend" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxReconciliationNonTaxableGainOnBargainPurchase" id="aepi_IncomeTaxReconciliationNonTaxableGainOnBargainPurchase" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxReconciliationUndistributedForeignEarnings" id="aepi_IncomeTaxReconciliationUndistributedForeignEarnings" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseInInventoriesFifoValue" id="aepi_IncreaseDecreaseInInventoriesFifoValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IndustrialLoansMember" id="aepi_IndustrialLoansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InformationRelatedToStockOptionActivityTableTextBlock" id="aepi_InformationRelatedToStockOptionActivityTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestRateOnMortgageNotePayableAfterInterestRateSwap" id="aepi_InterestRateOnMortgageNotePayableAfterInterestRateSwap" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestRateOnMortgageNotePayableBeforeInterestRateSwap" id="aepi_InterestRateOnMortgageNotePayableBeforeInterestRateSwap" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestRateSwapAgreementsTerm" id="aepi_InterestRateSwapAgreementsTerm" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestRateSwapsMaturityDate" id="aepi_InterestRateSwapsMaturityDate" type="us-types:dateStringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuanceOfCommonStockUponSettlementOfPerformanceUnits" id="aepi_IssuanceOfCommonStockUponSettlementOfPerformanceUnits" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuanceOfCommonStockUponSettlementOfPerformanceUnitsShares" id="aepi_IssuanceOfCommonStockUponSettlementOfPerformanceUnitsShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LeaseholdInterestMember" id="aepi_LeaseholdInterestMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LetterOfCredit" id="aepi_LetterOfCredit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LiabilityOnInterestRateSwaps" id="aepi_LiabilityOnInterestRateSwaps" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LiborBorrowingsInterestRateCreditFacility" id="aepi_LiborBorrowingsInterestRateCreditFacility" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LiborBorrowingsInterestRateMaximum" id="aepi_LiborBorrowingsInterestRateMaximum" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LiborBorrowingsInterestRateMinimum" id="aepi_LiborBorrowingsInterestRateMinimum" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LineOfCreditFacilityAmendedAndRestatedDate" id="aepi_LineOfCreditFacilityAmendedAndRestatedDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LongTermDebtPrincipalRepaymentAxis" id="aepi_LongTermDebtPrincipalRepaymentAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="LongTermDebtPrincipalRepaymentDomain" id="aepi_LongTermDebtPrincipalRepaymentDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LongTermFixedRateDebtCarryingValue" id="aepi_LongTermFixedRateDebtCarryingValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumPercentageOfAdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization" id="aepi_MaximumPercentageOfAdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumReleasingPeriodForEscrowDepositRegardingIndemnificationObligations" id="aepi_MaximumReleasingPeriodForEscrowDepositRegardingIndemnificationObligations" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MinimumPercentageOfAdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization" id="aepi_MinimumPercentageOfAdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MinimumReleasingPeriodForEscrowDepositRegardingIndemnificationObligations" id="aepi_MinimumReleasingPeriodForEscrowDepositRegardingIndemnificationObligations" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MortgageLoanMember" id="aepi_MortgageLoanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MortgageLoanNoteMember" id="aepi_MortgageLoanNoteMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MortgageNotePayableDescriptionOfInterestRateBasis" id="aepi_MortgageNotePayableDescriptionOfInterestRateBasis" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NewStockRepurchaseProgram" id="aepi_NewStockRepurchaseProgram" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NotesTwoThousandNineteenMember" id="aepi_NotesTwoThousandNineteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NotionalValueOfInterestRateSwapAgreement" id="aepi_NotionalValueOfInterestRateSwapAgreement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfCollectiveBargainingAgreements" id="aepi_NumberOfCollectiveBargainingAgreements" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfRightOnEachShareOfCommonStock" id="aepi_NumberOfRightOnEachShareOfCommonStock" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OneThousandNineHundredNinetyFiveMember" id="aepi_OneThousandNineHundredNinetyFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLossAndCapitalLossTaxCreditCarryforwardsLineItems" id="aepi_OperatingLossAndCapitalLossTaxCreditCarryforwardsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLossAndCapitalLossTaxCreditCarryforwardsTable" id="aepi_OperatingLossAndCapitalLossTaxCreditCarryforwardsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="OtherForeignCountriesMember" id="aepi_OtherForeignCountriesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherSecuritiesMember" id="aepi_OtherSecuritiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentForShareBasedLiabilityNetOfTaxWithholding" id="aepi_PaymentForShareBasedLiabilityNetOfTaxWithholding" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentsForRepurchaseOfCommonStockUnderShareRepurchaseProgram" id="aepi_PaymentsForRepurchaseOfCommonStockUnderShareRepurchaseProgram" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PennsylvaniaIndustrialLoansMember" id="aepi_PennsylvaniaIndustrialLoansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PennsylvaniaMember" id="aepi_PennsylvaniaMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfClosingPriceDiscountOnShareRepurchase" id="aepi_PercentageOfClosingPriceDiscountOnShareRepurchase" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfCommonSharesOutstanding" id="aepi_PercentageOfCommonSharesOutstanding" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfCurrentLiabilitiesToWhichIndividualAmountsInOtherAccruedLiabilitiesRepresented" id="aepi_PercentageOfCurrentLiabilitiesToWhichIndividualAmountsInOtherAccruedLiabilitiesRepresented" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfEmployeesCollectiveBargainingAgreement" id="aepi_PercentageOfEmployeesCollectiveBargainingAgreement" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfEmployeesCollectiveBargainingAgreementExpiresWithinOneYear" id="aepi_PercentageOfEmployeesCollectiveBargainingAgreementExpiresWithinOneYear" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfMarginOfPrimeRate" id="aepi_PercentageOfMarginOfPrimeRate" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfNotesToBeRedeemedAfterEquityOffering" id="aepi_PercentageOfNotesToBeRedeemedAfterEquityOffering" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfOwnership" id="aepi_PercentageOfOwnership" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfPreferredShareForEachRight" id="aepi_PercentageOfPreferredShareForEachRight" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfPurchasePriceHeldInEscrowRegardingIndemnificationObligations" id="aepi_PercentageOfPurchasePriceHeldInEscrowRegardingIndemnificationObligations" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfPurchasePriceHeldInEscrowUntilFinalNetCurrentAssetAdjustment" id="aepi_PercentageOfPurchasePriceHeldInEscrowUntilFinalNetCurrentAssetAdjustment" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PeriodForAutomaticRepaymentsThroughLockBox" id="aepi_PeriodForAutomaticRepaymentsThroughLockBox" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PeriodOfAmortization" id="aepi_PeriodOfAmortization" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PeriodOfAmortizationOfFeesCapitalizedRelatedToIssuanceOfSeniorNotes" id="aepi_PeriodOfAmortizationOfFeesCapitalizedRelatedToIssuanceOfSeniorNotes" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PreferredStockPurchasePrice" id="aepi_PreferredStockPurchasePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PremiumOnPurchaseOfSeniorNotes" id="aepi_PremiumOnPurchaseOfSeniorNotes" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProductFiveMember" id="aepi_ProductFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProductFourMember" id="aepi_ProductFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProductOneMember" id="aepi_ProductOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProductSevenMember" id="aepi_ProductSevenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProductSixMember" id="aepi_ProductSixMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProductThreeMember" id="aepi_ProductThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProductTwoMember" id="aepi_ProductTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProFormaBusinessAcquisitionEffectiveDateOfAcquisition" id="aepi_ProFormaBusinessAcquisitionEffectiveDateOfAcquisition" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProvisionForIncomeTaxesLineItems" id="aepi_ProvisionForIncomeTaxesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProvisionForIncomeTaxesTable" id="aepi_ProvisionForIncomeTaxesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="PurchasePriceOfPreviouslyLeasedFacility" id="aepi_PurchasePriceOfPreviouslyLeasedFacility" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReclassificationPolicyTextBlock" id="aepi_ReclassificationPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RelatedPartyOneMember" id="aepi_RelatedPartyOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RelatedPartyThreeMember" id="aepi_RelatedPartyThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RelatedPartyTwoMember" id="aepi_RelatedPartyTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReleasingPeriodForEscrowDepositRegardingRemainingAmounts" id="aepi_ReleasingPeriodForEscrowDepositRegardingRemainingAmounts" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepurchasedStockAveragePricePaidPerShare" id="aepi_RepurchasedStockAveragePricePaidPerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepurchasePriceUnderChangeOfControl" id="aepi_RepurchasePriceUnderChangeOfControl" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepurchasePriceUnderSaleOfCertainAssets" id="aepi_RepurchasePriceUnderSaleOfCertainAssets" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RightsPlanMember" id="aepi_RightsPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfAccruedLiabilitiesLineItems" id="aepi_ScheduleOfAccruedLiabilitiesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfAmortizationExpenseAndWeightedAverageLivesOfIdentifiedIntangibleAssetsLineItems" id="aepi_ScheduleOfAmortizationExpenseAndWeightedAverageLivesOfIdentifiedIntangibleAssetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfAmortizationExpenseAndWeightedAverageLivesOfIdentifiedIntangibleAssetsTable" id="aepi_ScheduleOfAmortizationExpenseAndWeightedAverageLivesOfIdentifiedIntangibleAssetsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfCapitalLeasesFutureMinimumPaymentsReceivableLineItems" id="aepi_ScheduleOfCapitalLeasesFutureMinimumPaymentsReceivableLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfCapitalLeasesFutureMinimumPaymentsReceivableTable" id="aepi_ScheduleOfCapitalLeasesFutureMinimumPaymentsReceivableTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfInventoryLineItems" id="aepi_ScheduleOfInventoryLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfInventoryTable" id="aepi_ScheduleOfInventoryTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfNonvestedStockOptionsActivityTableTextBlock" id="aepi_ScheduleOfNonvestedStockOptionsActivityTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfOperatingLeasesLineItems" id="aepi_ScheduleOfOperatingLeasesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfOperatingLeasesTable" id="aepi_ScheduleOfOperatingLeasesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfQuarterlyFinancialDataLineItems" id="aepi_ScheduleOfQuarterlyFinancialDataLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfQuarterlyFinancialDataTable" id="aepi_ScheduleOfQuarterlyFinancialDataTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfSegmentAndGeographicInformationTextBlock" id="aepi_ScheduleOfSegmentAndGeographicInformationTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfStockRepurchaseProgramTable" id="aepi_ScheduleOfStockRepurchaseProgramTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleValuationAndQualifyingAccountsAbstract" id="aepi_ScheduleValuationAndQualifyingAccountsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SellingExpenseOnly" id="aepi_SellingExpenseOnly" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitAggregateIntrinsicValueVestedAndExpectedToVest" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitAggregateIntrinsicValueVestedAndExpectedToVest" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsAggregateIntrinsicValue" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsAggregateIntrinsicValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsAggregateIntrinsicValueVestedAndExpectedToVest" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsAggregateIntrinsicValueVestedAndExpectedToVest" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsExercisable" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsExercisable" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsExercised" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsExercised" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsExercisedAggregateIntrinsicValue" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsExercisedAggregateIntrinsicValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsExercisedWeightedAverageExercisePrice" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsExercisedWeightedAverageExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsForfeitedOrCancelled" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsForfeitedOrCancelled" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsGrantedInPeriod" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsGrantedInPeriod" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsGrantedWeightedAverageExercisePrice" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsGrantedWeightedAverageExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsOutstanding" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsOutstanding" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsOutstandingWeightedAverageExercisePrice" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsOutstandingWeightedAverageExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsVestedAndExpectedToVestWeightedAverageExercisePrice" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsVestedAndExpectedToVestWeightedAverageExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsWeightedAverageRemainingContractualTerm" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsWeightedAverageRemainingContractualTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByPerformanceUnitsWeightedAverageRemainingContractualTermVestedAndExpectedToVest" id="aepi_ShareBasedCompensationArrangementByPerformanceUnitsWeightedAverageRemainingContractualTermVestedAndExpectedToVest" type="xbrli:durationItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsForfeituresInPeriod" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsForfeituresInPeriod" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsForfeituresInPeriodWeightedAverageGrantDateFairValue" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsForfeituresInPeriodWeightedAverageGrantDateFairValue" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsOutstandingNumber" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsOutstandingNumber" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsOutstandingWeightedAverageGrantDateFairValue" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsOutstandingWeightedAverageGrantDateFairValue" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsThatVestedInPeriod" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsThatVestedInPeriod" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsThatVestedInPeriodWeightedAverageGrantDateFairValue" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonVestedOptionsThatVestedInPeriodWeightedAverageGrantDateFairValue" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedOptionPricePerShare" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedOptionPricePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsOptionPricePerShare" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsOptionPricePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresOptionPricePerShare" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresOptionPricePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodOptionPricePerShare" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodOptionPricePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingOptionPricePerShare" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingOptionPricePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsExercisableWeightedAverageRemainingContractualTermOne" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsExercisableWeightedAverageRemainingContractualTermOne" type="xbrli:durationItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsOutstandingWeightedAverageRemainingContractualTermTwo" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsOutstandingWeightedAverageRemainingContractualTermTwo" type="xbrli:durationItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTermOne" id="aepi_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTermOne" type="xbrli:durationItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SpecificAmountOfExcessAvailability" id="aepi_SpecificAmountOfExcessAvailability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SpringingLockBoxTrigger" id="aepi_SpringingLockBoxTrigger" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockOptionGrantedToNonEmployeeDirectors" id="aepi_StockOptionGrantedToNonEmployeeDirectors" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockOptionPlanExpirationDate" id="aepi_StockOptionPlanExpirationDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockOptionPlansActivityAbstract" id="aepi_StockOptionPlansActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockOptionsExcludedComputationOfDilutedEarningsPerShare" id="aepi_StockOptionsExcludedComputationOfDilutedEarningsPerShare" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockOptionsExcludedFromComputationOfEarningsPerShareAmount" id="aepi_StockOptionsExcludedFromComputationOfEarningsPerShareAmount" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockRepurchaseActivityTableTextBlock" id="aepi_StockRepurchaseActivityTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockRepurchaseProgramAmountsBeforeAndAfterIncreaseInAuthorizedAmounts" id="aepi_StockRepurchaseProgramAmountsBeforeAndAfterIncreaseInAuthorizedAmounts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockRepurchaseProgramLineItems" id="aepi_StockRepurchaseProgramLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockRepurchaseProgramTwoMember" id="aepi_StockRepurchaseProgramTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SupplierAMember" id="aepi_SupplierAMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SupplierBMember" id="aepi_SupplierBMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SupplierCMember" id="aepi_SupplierCMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TaxCreditCarryforwardsWithoutExpirationDate" id="aepi_TaxCreditCarryforwardsWithoutExpirationDate" type="xbrli:normalizedStringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TerminationPeriodOfRightsPlan" id="aepi_TerminationPeriodOfRightsPlan" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TranscoMember" id="aepi_TranscoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TranslationAdjustmentReversalIntoIncomeRelatedToSubsidiaries" id="aepi_TranslationAdjustmentReversalIntoIncomeRelatedToSubsidiaries" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandFiveMember" id="aepi_TwoThousandFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandFiveOptionPlanLife" id="aepi_TwoThousandFiveOptionPlanLife" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandFiveOptionPlanMember" id="aepi_TwoThousandFiveOptionPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnsoldSharesInEmployeeStockPurchasePlan" id="aepi_UnsoldSharesInEmployeeStockPurchasePlan" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="USMember" id="aepi_USMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ValuationAllowancesAndReservesForeignExchangeAndOther" id="aepi_ValuationAllowancesAndReservesForeignExchangeAndOther" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ValueOfAssetsPurchased" id="aepi_ValueOfAssetsPurchased" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VariableInterestRateBorrowingsMaximum" id="aepi_VariableInterestRateBorrowingsMaximum" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VariableInterestRateBorrowingsMinimum" id="aepi_VariableInterestRateBorrowingsMinimum" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WebsterIndustriesMember" id="aepi_WebsterIndustriesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WebsterMember" id="aepi_WebsterMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAverageAmortizationPeriodsIntangibleAssetsTableTextBlock" id="aepi_WeightedAverageAmortizationPeriodsIntangibleAssetsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAverageFairValueOfOptionsGrantedAbstract" id="aepi_WeightedAverageFairValueOfOptionsGrantedAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAverageInterestRateOfCapitalLeaseObligations" id="aepi_WeightedAverageInterestRateOfCapitalLeaseObligations" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAverageRemainingContractualTermAbstract" id="aepi_WeightedAverageRemainingContractualTermAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>
