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    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_28B39F8EA8C68509D95749B111757BD4_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_28B39F8EA8C68509D95749B111757BD4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_28B39F8EA8C68509D95749B111757BD4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_F935AA7012C31A27A21449B11176F4C7_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_F935AA7012C31A27A21449B11176F4C7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum borrowing capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_F935AA7012C31A27A21449B11176F4C7_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_F935AA7012C31A27A21449B11176F4C7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
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    <link:label id="lab_us-gaap_LinesOfCreditCurrent_3746F4320AFC597C6CA649B111762BE7_label_en-US" xlink:label="lab_us-gaap_LinesOfCreditCurrent_3746F4320AFC597C6CA649B111762BE7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit, Current</link:label>
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    <link:label id="lab_us-gaap_InterestExpense_7A58B4C91817705E584249B1117664BE_label_en-US" xlink:label="lab_us-gaap_InterestExpense_7A58B4C91817705E584249B1117664BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Expense</link:label>
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    <link:label id="lab_us-gaap_RepaymentsOfSecuredDebt_38C969B23AD5B2915D6049B11176479C_verboseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfSecuredDebt_38C969B23AD5B2915D6049B11176479C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Partial redemptions</link:label>
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    <link:label id="lab_thr_PremiumsPaidOnRedemptionOfSeniorSecuredNotes_15522BDD38816934D76E49B111765C26_terseLabel_en-US" xlink:label="lab_thr_PremiumsPaidOnRedemptionOfSeniorSecuredNotes_15522BDD38816934D76E49B111765C26" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash premiums paid on redemption</link:label>
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    <link:label id="lab_us-gaap_AmortizationOfDeferredCharges_F421197E24016FA2C6AD49B1117615C7_verboseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfDeferredCharges_F421197E24016FA2C6AD49B1117615C7" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Deferred debt amortization</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_84E08530B3D4E7A8A7F749B111768712_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_84E08530B3D4E7A8A7F749B111768712" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Face amount of term loan</link:label>
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    <link:label id="lab_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract_42781D5B850F00C89F4949B1117603F7_terseLabel_en-US" xlink:label="lab_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract_42781D5B850F00C89F4949B1117603F7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign Currency Transaction Risk</link:label>
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    <link:label id="lab_currency_EUR_28E454CA9EB6E8446A0F24CF313634E7_terseLabel_en-US" xlink:label="lab_currency_EUR_28E454CA9EB6E8446A0F24CF313634E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Euro [Member]</link:label>
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    <link:label id="lab_currency_KRW_6B88D1E0FC944E4B40C024CF313677FF_label_en-US" xlink:label="lab_currency_KRW_6B88D1E0FC944E4B40C024CF313677FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Korea (South), Won</link:label>
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    <link:label id="lab_thr_OherCurrencyMember_55932FD8A064E521F1CE24CF31361887_terseLabel_en-US" xlink:label="lab_thr_OherCurrencyMember_55932FD8A064E521F1CE24CF31361887" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other [Member]</link:label>
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    <link:loc xlink:href="thr-20140331.xsd#thr_OherCurrencyMember" xlink:label="loc_thr_OherCurrencyMember_55932FD8A064E521F1CE24CF31361887" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeInstrumentRiskAxis_1E631D9DAD0C6BE741D724CF3136738C_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentRiskAxis_1E631D9DAD0C6BE741D724CF3136738C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Instrument Risk [Axis]</link:label>
    <link:label id="lab_us-gaap_DerivativeInstrumentRiskAxis_1E631D9DAD0C6BE741D724CF3136738C_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentRiskAxis_1E631D9DAD0C6BE741D724CF3136738C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instrument [Axis]</link:label>
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    <link:label id="lab_us-gaap_DerivativeContractTypeDomain_91733F4B8216C5DEF8CF24CF3136977F_label_en-US" xlink:label="lab_us-gaap_DerivativeContractTypeDomain_91733F4B8216C5DEF8CF24CF3136977F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Contract [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_91733F4B8216C5DEF8CF24CF3136977F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ForeignExchangeForwardMember_693AD72473A3393FF86A24CF31367DB8_label_en-US" xlink:label="lab_us-gaap_ForeignExchangeForwardMember_693AD72473A3393FF86A24CF31367DB8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Foreign Exchange Forward [Member]</link:label>
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    <link:label id="lab_us-gaap_DerivativeLineItems_06DD7FAA72ECCD164BA624CF313BE599_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLineItems_06DD7FAA72ECCD164BA624CF313BE599" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivatives [Line Items]</link:label>
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    <link:label id="lab_us-gaap_RelatedPartyTransactionsAbstract_440612E21FCE3DD7C69C432AA926F4D5_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsAbstract_440612E21FCE3DD7C69C432AA926F4D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transactions [Abstract]</link:label>
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    <link:label id="lab_us-gaap_OtherOperatingActivitiesCashFlowStatement_8784AF1C762E0C0F15B94B0212F36A7A_terseLabel_en-US" xlink:label="lab_us-gaap_OtherOperatingActivitiesCashFlowStatement_8784AF1C762E0C0F15B94B0212F36A7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other non-cash operating activities</link:label>
    <link:label id="lab_us-gaap_OtherOperatingActivitiesCashFlowStatement_8784AF1C762E0C0F15B94B0212F36A7A_label_en-US" xlink:label="lab_us-gaap_OtherOperatingActivitiesCashFlowStatement_8784AF1C762E0C0F15B94B0212F36A7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Operating Activities, Cash Flow Statement</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_E8CC11AD6568C36F75474B0212F3566C_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_E8CC11AD6568C36F75474B0212F3566C" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_496C097364ED892B86C74B0212F44740_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_496C097364ED892B86C74B0212F44740" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current and noncurrent assets</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_D50382370C8A39DECAFB4B0212F46CA9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_B6A1C43AD455F7C140984B0212F47F95_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_B6A1C43AD455F7C140984B0212F47F95" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued liabilities and noncurrent liabilities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_043704FA19C901812FFE4B0212F4486E_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_043704FA19C901812FFE4B0212F4486E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxReconciliationOtherAdjustments_D52991E8D25CD3001B014D7E9F6A80F6_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxReconciliationOtherAdjustments_D52991E8D25CD3001B014D7E9F6A80F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
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    <link:label id="lab_currency_JPY_1B598F08E5F95E2FC31424CF31E086FF_label_en-US" xlink:label="lab_currency_JPY_1B598F08E5F95E2FC31424CF31E086FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Japan, Yen</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/currency/2012/currency-2012-01-31.xsd#currency_JPY" xlink:label="loc_currency_JPY_1B598F08E5F95E2FC31424CF31E086FF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CreditFacilityAxis_988C6D362E86CC8C8BE624CF31E09A95_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_988C6D362E86CC8C8BE624CF31E09A95" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Facility [Axis]</link:label>
    <link:label id="lab_us-gaap_CreditFacilityAxis_988C6D362E86CC8C8BE624CF31E09A95_label_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_988C6D362E86CC8C8BE624CF31E09A95" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit Facility [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_988C6D362E86CC8C8BE624CF31E09A95" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CreditFacilityDomain_193280B05C300A9BED8024CF31E07468_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_193280B05C300A9BED8024CF31E07468" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit Facility [Domain]</link:label>
    <link:label id="lab_us-gaap_CreditFacilityDomain_193280B05C300A9BED8024CF31E07468_label_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_193280B05C300A9BED8024CF31E07468" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit Facility [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_193280B05C300A9BED8024CF31E07468" xlink:type="locator" />
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    <link:label id="lab_thr_CountryAxis_8DAA1E526B88E483A73D24CF31E0C143_terseLabel_en-US" xlink:label="lab_thr_CountryAxis_8DAA1E526B88E483A73D24CF31E0C143" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Country [Axis]</link:label>
    <link:label id="lab_thr_CountryAxis_8DAA1E526B88E483A73D24CF31E0C143_label_en-US" xlink:label="lab_thr_CountryAxis_8DAA1E526B88E483A73D24CF31E0C143" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Country [Axis]</link:label>
    <link:label id="lab_thr_CountryAxis_8DAA1E526B88E483A73D24CF31E0C143_documentation_en-US" xlink:label="lab_thr_CountryAxis_8DAA1E526B88E483A73D24CF31E0C143" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the geopolitical area recognized by governments of the world as a country.</link:label>
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    <link:label id="lab_country_AllCountriesDomain_B173526538570794A5FA24CF31E0B98F_terseLabel_en-US" xlink:label="lab_country_AllCountriesDomain_B173526538570794A5FA24CF31E0B98F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">All Countries [Domain]</link:label>
    <link:label id="lab_country_AllCountriesDomain_B173526538570794A5FA24CF31E0B98F_label_en-US" xlink:label="lab_country_AllCountriesDomain_B173526538570794A5FA24CF31E0B98F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">All Countries [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd#country_AllCountriesDomain" xlink:label="loc_country_AllCountriesDomain_B173526538570794A5FA24CF31E0B98F" xlink:type="locator" />
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    <link:label id="lab_country_NL_037927160987A56FE94524CF31E0DDAA_terseLabel_en-US" xlink:label="lab_country_NL_037927160987A56FE94524CF31E0DDAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Netherlands [Member]</link:label>
    <link:label id="lab_country_NL_037927160987A56FE94524CF31E0DDAA_label_en-US" xlink:label="lab_country_NL_037927160987A56FE94524CF31E0DDAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">NETHERLANDS</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd#country_NL" xlink:label="loc_country_NL_037927160987A56FE94524CF31E0DDAA" xlink:type="locator" />
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    <link:label id="lab_country_IN_1AAFC7A7ABE70B07398E24CF31E1BD08_terseLabel_en-US" xlink:label="lab_country_IN_1AAFC7A7ABE70B07398E24CF31E1BD08" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">India [Member]</link:label>
    <link:label id="lab_country_IN_1AAFC7A7ABE70B07398E24CF31E1BD08_label_en-US" xlink:label="lab_country_IN_1AAFC7A7ABE70B07398E24CF31E1BD08" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">INDIA</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd#country_IN" xlink:label="loc_country_IN_1AAFC7A7ABE70B07398E24CF31E1BD08" xlink:type="locator" />
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    <link:label id="lab_country_AU_6ED2DAF80AAFF5E3DFE624CF31E16376_terseLabel_en-US" xlink:label="lab_country_AU_6ED2DAF80AAFF5E3DFE624CF31E16376" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Australia [Member]</link:label>
    <link:label id="lab_country_AU_6ED2DAF80AAFF5E3DFE624CF31E16376_label_en-US" xlink:label="lab_country_AU_6ED2DAF80AAFF5E3DFE624CF31E16376" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AUSTRALIA</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd#country_AU" xlink:label="loc_country_AU_6ED2DAF80AAFF5E3DFE624CF31E16376" xlink:type="locator" />
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    <link:label id="lab_country_JP_4AC169ECE269E8B8961724CF31E15BD9_label_en-US" xlink:label="lab_country_JP_4AC169ECE269E8B8961724CF31E15BD9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">JAPAN</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd#country_JP" xlink:label="loc_country_JP_4AC169ECE269E8B8961724CF31E15BD9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_JP_4AC169ECE269E8B8961724CF31E15BD9" xlink:to="lab_country_JP_4AC169ECE269E8B8961724CF31E15BD9" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityLineItems_DA3704FF168B74F42D9724CF31E2F860_verboseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLineItems_DA3704FF168B74F42D9724CF31E2F860" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Short-Term Revolving Lines of Credit</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityLineItems_DA3704FF168B74F42D9724CF31E2F860_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLineItems_DA3704FF168B74F42D9724CF31E2F860" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_DA3704FF168B74F42D9724CF31E2F860" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_851033217678AEE0D82C24CF2F954660_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_851033217678AEE0D82C24CF2F954660" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Taxes</link:label>
    <link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_851033217678AEE0D82C24CF2F954660_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_851033217678AEE0D82C24CF2F954660" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Disclosure [Text Block]</link:label>
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    <link:label id="lab_us-gaap_LossContingenciesTable_96508FCAF1D95D338AA94D8FB5166AB3_label_en-US" xlink:label="lab_us-gaap_LossContingenciesTable_96508FCAF1D95D338AA94D8FB5166AB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingencies [Table]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_5EF2C60CD197FD3F14DD4D9363F8D8DE" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_5693D7984F1FEE2EE14A4D9364006000" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LossContingenciesByNatureOfContingencyAxis_D6DB014F85A058E96CEB4D8FB517356A_label_en-US" xlink:label="lab_us-gaap_LossContingenciesByNatureOfContingencyAxis_D6DB014F85A058E96CEB4D8FB517356A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingency Nature [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_D6DB014F85A058E96CEB4D8FB517356A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LossContingencyNatureDomain_9D5C96080C6C6071CFA54D8FB5172CE6_label_en-US" xlink:label="lab_us-gaap_LossContingencyNatureDomain_9D5C96080C6C6071CFA54D8FB5172CE6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingency, Nature [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_9D5C96080C6C6071CFA54D8FB5172CE6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingencyNatureDomain_9D5C96080C6C6071CFA54D8FB5172CE6" xlink:to="lab_us-gaap_LossContingencyNatureDomain_9D5C96080C6C6071CFA54D8FB5172CE6" xlink:type="arc" />
    <link:label id="lab_thr_TaxDisputeWithCanadaRevenueAgencyMember_BCEE1A5BC3E8865627514D8FB517F2F4_terseLabel_en-US" xlink:label="lab_thr_TaxDisputeWithCanadaRevenueAgencyMember_BCEE1A5BC3E8865627514D8FB517F2F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Notice of Tax Dispute with the Canada Revenue Agency [Member]</link:label>
    <link:label id="lab_thr_TaxDisputeWithCanadaRevenueAgencyMember_BCEE1A5BC3E8865627514D8FB517F2F4_label_en-US" xlink:label="lab_thr_TaxDisputeWithCanadaRevenueAgencyMember_BCEE1A5BC3E8865627514D8FB517F2F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tax Dispute with Canada Revenue Agency [Member]</link:label>
    <link:label id="lab_thr_TaxDisputeWithCanadaRevenueAgencyMember_BCEE1A5BC3E8865627514D8FB517F2F4_documentation_en-US" xlink:label="lab_thr_TaxDisputeWithCanadaRevenueAgencyMember_BCEE1A5BC3E8865627514D8FB517F2F4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the notice received by the entity from the Canada Revenue Agency relating to tax disputes.</link:label>
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    <link:label id="lab_us-gaap_ManagementMember_96D4249045DDA888F1B04D8FB51736CA_label_en-US" xlink:label="lab_us-gaap_ManagementMember_96D4249045DDA888F1B04D8FB51736CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Management [Member]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_86797A8DB0F86CF100E34D8FB517EDA9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GuaranteeObligationsMaximumExposure_E9B4E08C878F71E63B994D8FB51797C9_terseLabel_en-US" xlink:label="lab_us-gaap_GuaranteeObligationsMaximumExposure_E9B4E08C878F71E63B994D8FB51797C9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Totaled arrangements under letter of credit guarantees and performance bonds securing performance obligations</link:label>
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    <link:label id="lab_thr_GuaranteeObligationsSecuredByCashDeposits_5092DCBEA4BFBA71D06B4D8FB517F099_terseLabel_en-US" xlink:label="lab_thr_GuaranteeObligationsSecuredByCashDeposits_5092DCBEA4BFBA71D06B4D8FB517F099" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Guarantee obligations secured by cash deposits</link:label>
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    <link:label id="lab_us-gaap_LeaseAndRentalExpense_28E72AD1AC4B86F05AEB4D8FB51707F4_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_28E72AD1AC4B86F05AEB4D8FB51707F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease expense</link:label>
    <link:label id="lab_us-gaap_LeaseAndRentalExpense_28E72AD1AC4B86F05AEB4D8FB51707F4_label_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_28E72AD1AC4B86F05AEB4D8FB51707F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Rent Expense</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_91E08CAFC8E65E9EBC6D4D8FB51745E5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_91E08CAFC8E65E9EBC6D4D8FB51745E5" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_91E08CAFC8E65E9EBC6D4D8FB51745E5" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_D711EA83B7E8B7CAAF0A4D8FB5179BED_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_D711EA83B7E8B7CAAF0A4D8FB5179BED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2014</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_D711EA83B7E8B7CAAF0A4D8FB5179BED_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_D711EA83B7E8B7CAAF0A4D8FB5179BED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Due, Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_D711EA83B7E8B7CAAF0A4D8FB5179BED" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_D711EA83B7E8B7CAAF0A4D8FB5179BED" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_D711EA83B7E8B7CAAF0A4D8FB5179BED" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_60D7343230D6D8B2DF7F4D8FB51836DC_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_60D7343230D6D8B2DF7F4D8FB51836DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2015</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_60D7343230D6D8B2DF7F4D8FB51836DC_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_60D7343230D6D8B2DF7F4D8FB51836DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Two Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_60D7343230D6D8B2DF7F4D8FB51836DC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_60D7343230D6D8B2DF7F4D8FB51836DC" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_60D7343230D6D8B2DF7F4D8FB51836DC" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B02D9AAE46C7002F0D1A4D8FB51886A7_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B02D9AAE46C7002F0D1A4D8FB51886A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2016</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B02D9AAE46C7002F0D1A4D8FB51886A7_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B02D9AAE46C7002F0D1A4D8FB51886A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Three Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B02D9AAE46C7002F0D1A4D8FB51886A7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B02D9AAE46C7002F0D1A4D8FB51886A7" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B02D9AAE46C7002F0D1A4D8FB51886A7" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_571F627CA96FE16C4B2C4D8FB5189C60_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_571F627CA96FE16C4B2C4D8FB5189C60" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2017</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_571F627CA96FE16C4B2C4D8FB5189C60_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_571F627CA96FE16C4B2C4D8FB5189C60" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Four Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_571F627CA96FE16C4B2C4D8FB5189C60" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_571F627CA96FE16C4B2C4D8FB5189C60" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_571F627CA96FE16C4B2C4D8FB5189C60" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_DD59E526D5F8A6EF76FC4D8FB5183720_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_DD59E526D5F8A6EF76FC4D8FB5183720" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2018</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_DD59E526D5F8A6EF76FC4D8FB5183720" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_DD59E526D5F8A6EF76FC4D8FB5183720" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_DD59E526D5F8A6EF76FC4D8FB5183720" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_A33C622935C2BC5EBBFB4D8FB518616B_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_A33C622935C2BC5EBBFB4D8FB518616B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Thereafter</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_A33C622935C2BC5EBBFB4D8FB518616B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_67FBC62D99A197E3A82A4D8FB51DFE7D_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_67FBC62D99A197E3A82A4D8FB51DFE7D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Due</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_67FBC62D99A197E3A82A4D8FB51DFE7D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InformationTechnologyAndDataProcessing_A5A3F192CBA1F218F6F04D8FB51D72E4_terseLabel_en-US" xlink:label="lab_us-gaap_InformationTechnologyAndDataProcessing_A5A3F192CBA1F218F6F04D8FB51D72E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service fee expense</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InformationTechnologyAndDataProcessing" xlink:label="loc_us-gaap_InformationTechnologyAndDataProcessing_A5A3F192CBA1F218F6F04D8FB51D72E4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_7A1384FC1353621D21CB4D8FB51D3BAB_terseLabel_en-US" xlink:label="lab_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_7A1384FC1353621D21CB4D8FB51D3BAB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase Obligation, Fiscal Year Maturity [Abstract]</link:label>
    <link:label id="lab_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_7A1384FC1353621D21CB4D8FB51D3BAB_label_en-US" xlink:label="lab_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_7A1384FC1353621D21CB4D8FB51D3BAB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Obligation, Fiscal Year Maturity [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PurchaseObligationFiscalYearMaturityAbstract" xlink:label="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_7A1384FC1353621D21CB4D8FB51D3BAB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PurchaseObligationDueInNextTwelveMonths_8C14B47A8822383B600F4D8FB51E7E00_terseLabel_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInNextTwelveMonths_8C14B47A8822383B600F4D8FB51E7E00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2014</link:label>
    <link:label id="lab_us-gaap_PurchaseObligationDueInNextTwelveMonths_8C14B47A8822383B600F4D8FB51E7E00_label_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInNextTwelveMonths_8C14B47A8822383B600F4D8FB51E7E00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Obligation, Due in Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PurchaseObligationDueInNextTwelveMonths" xlink:label="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_8C14B47A8822383B600F4D8FB51E7E00" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PurchaseObligationDueInSecondYear_85F117059E0FA21790294D8FB51EFB72_terseLabel_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInSecondYear_85F117059E0FA21790294D8FB51EFB72" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2015</link:label>
    <link:label id="lab_us-gaap_PurchaseObligationDueInSecondYear_85F117059E0FA21790294D8FB51EFB72_label_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInSecondYear_85F117059E0FA21790294D8FB51EFB72" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Obligation, Due in Second Year</link:label>
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsGross_F3630588A824291EE802432F7126ED86_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsGross_F3630588A824291EE802432F7126ED86" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Gross</link:label>
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    <link:label id="lab_us-gaap_InterestPayableCurrent_4FBB1985FA32B1CB03AE24CF2F61FE74_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPayableCurrent_4FBB1985FA32B1CB03AE24CF2F61FE74" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest</link:label>
    <link:label id="lab_us-gaap_InterestPayableCurrent_4FBB1985FA32B1CB03AE24CF2F61FE74_label_en-US" xlink:label="lab_us-gaap_InterestPayableCurrent_4FBB1985FA32B1CB03AE24CF2F61FE74" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Payable, Current</link:label>
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    <link:label id="lab_us-gaap_CustomerAdvancesCurrent_2475B44E16F7E28781BE24CF2F61559F_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerAdvancesCurrent_2475B44E16F7E28781BE24CF2F61559F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Customer prepayment</link:label>
    <link:label id="lab_us-gaap_CustomerAdvancesCurrent_2475B44E16F7E28781BE24CF2F61559F_label_en-US" xlink:label="lab_us-gaap_CustomerAdvancesCurrent_2475B44E16F7E28781BE24CF2F61559F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer Advances, Current</link:label>
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    <link:label id="lab_us-gaap_ProductWarrantyAccrualClassifiedCurrent_CAC79AACB9DE0768AC2F24CF2F6139E3_terseLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualClassifiedCurrent_CAC79AACB9DE0768AC2F24CF2F6139E3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warranty reserve</link:label>
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    <link:label id="lab_us-gaap_AccruedProfessionalFeesCurrent_9D64C4468DD7AF9F63F924CF2F61B9C3_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedProfessionalFeesCurrent_9D64C4468DD7AF9F63F924CF2F61B9C3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Professional fees</link:label>
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    <link:label id="lab_us-gaap_SalesAndExciseTaxPayableCurrent_08F4525EF339052EAFE624CF2F61502B_terseLabel_en-US" xlink:label="lab_us-gaap_SalesAndExciseTaxPayableCurrent_08F4525EF339052EAFE624CF2F61502B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sales tax payable</link:label>
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    <link:label id="lab_us-gaap_SecuredDebt_07740818BED0A03CE80E24CF2E4EF8EE_terseLabel_en-US" xlink:label="lab_us-gaap_SecuredDebt_07740818BED0A03CE80E24CF2E4EF8EE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Secured Debt</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A84506E00B063BC5E521456CE66B7C87_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A84506E00B063BC5E521456CE66B7C87" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A84506E00B063BC5E521456CE66B7C87" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A84506E00B063BC5E521456CE66B7C87" xlink:to="lab_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_A84506E00B063BC5E521456CE66B7C87" xlink:type="arc" />
    <link:label id="lab_thr_OtherComprehensiveIncomeLossDerivativeAssetsTransferredintoAOCICarryingValue_47A1201520F1D85F989D456CE66B9881_terseLabel_en-US" xlink:label="lab_thr_OtherComprehensiveIncomeLossDerivativeAssetsTransferredintoAOCICarryingValue_47A1201520F1D85F989D456CE66B9881" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Add: non-fair value derivative asset transferred into accumulated other comprehensive income</link:label>
    <link:label id="lab_thr_OtherComprehensiveIncomeLossDerivativeAssetsTransferredintoAOCICarryingValue_47A1201520F1D85F989D456CE66B9881_label_en-US" xlink:label="lab_thr_OtherComprehensiveIncomeLossDerivativeAssetsTransferredintoAOCICarryingValue_47A1201520F1D85F989D456CE66B9881" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income Loss , Derivative Assets Transferred into AOCI, Carrying Value</link:label>
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    <link:loc xlink:href="thr-20140331.xsd#thr_OtherComprehensiveIncomeLossDerivativeAssetsTransferredintoAOCICarryingValue" xlink:label="loc_thr_OtherComprehensiveIncomeLossDerivativeAssetsTransferredintoAOCICarryingValue_47A1201520F1D85F989D456CE66B9881" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_thr_OtherComprehensiveIncomeLossDerivativeAssetsTransferredintoAOCICarryingValue_47A1201520F1D85F989D456CE66B9881" xlink:to="lab_thr_OtherComprehensiveIncomeLossDerivativeAssetsTransferredintoAOCICarryingValue_47A1201520F1D85F989D456CE66B9881" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_2C8F7E4C7C7307CBAD94456CE66BD2FA_terseLabel_en-US" xlink:label="lab_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_2C8F7E4C7C7307CBAD94456CE66BD2FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Less: loss reclassified into earnings from effective hedge</link:label>
    <link:label id="lab_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_2C8F7E4C7C7307CBAD94456CE66BD2FA_label_en-US" xlink:label="lab_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_2C8F7E4C7C7307CBAD94456CE66BD2FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_2C8F7E4C7C7307CBAD94456CE66BD2FA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DerivativeInstrumentsLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting_204CA27BF39864735BB1456CE66B6040_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting_204CA27BF39864735BB1456CE66B6040" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Less: ineffective portion of hedge transferred into earnings</link:label>
    <link:label id="lab_us-gaap_DerivativeInstrumentsLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting_204CA27BF39864735BB1456CE66B6040_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting_204CA27BF39864735BB1456CE66B6040" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Instruments, Loss Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeInstrumentsLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting" xlink:label="loc_us-gaap_DerivativeInstrumentsLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting_204CA27BF39864735BB1456CE66B6040" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_0A2C26CBEA39C0309696456CE66B3608_periodEndLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_0A2C26CBEA39C0309696456CE66B3608" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Unrealized loss at end of the period</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_0A2C26CBEA39C0309696456CE66B3608" xlink:to="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_0A2C26CBEA39C0309696456CE66B3608" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_D23FFC1D11842C564FAB24CF2EE03A82_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_D23FFC1D11842C564FAB24CF2EE03A82" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of accrued current liabilities</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_D23FFC1D11842C564FAB24CF2EE03A82_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_D23FFC1D11842C564FAB24CF2EE03A82" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Accrued Liabilities [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_D23FFC1D11842C564FAB24CF2EE03A82" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_D23FFC1D11842C564FAB24CF2EE03A82" xlink:to="lab_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_D23FFC1D11842C564FAB24CF2EE03A82" xlink:type="arc" />
    <link:label id="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_E64B6B9A5C3D0C1A54E424CF2DEF2613_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_E64B6B9A5C3D0C1A54E424CF2DEF2613" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related-Party Transactions</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_E64B6B9A5C3D0C1A54E424CF2DEF2613_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_E64B6B9A5C3D0C1A54E424CF2DEF2613" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transactions Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:label="loc_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_E64B6B9A5C3D0C1A54E424CF2DEF2613" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_E64B6B9A5C3D0C1A54E424CF2DEF2613" xlink:to="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_E64B6B9A5C3D0C1A54E424CF2DEF2613" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryWorkInProcess_DDE7DCEF6EA3A13FD70B3F0D030B1DC0_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryWorkInProcess_DDE7DCEF6EA3A13FD70B3F0D030B1DC0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Work in process</link:label>
    <link:label id="lab_us-gaap_InventoryWorkInProcess_DDE7DCEF6EA3A13FD70B3F0D030B1DC0_label_en-US" xlink:label="lab_us-gaap_InventoryWorkInProcess_DDE7DCEF6EA3A13FD70B3F0D030B1DC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Work in Process, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryWorkInProcess" xlink:label="loc_us-gaap_InventoryWorkInProcess_DDE7DCEF6EA3A13FD70B3F0D030B1DC0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryWorkInProcess_DDE7DCEF6EA3A13FD70B3F0D030B1DC0" xlink:to="lab_us-gaap_InventoryWorkInProcess_DDE7DCEF6EA3A13FD70B3F0D030B1DC0" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryRawMaterials_C5220D5AB54FA627BAD73F0D030C62AB_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryRawMaterials_C5220D5AB54FA627BAD73F0D030C62AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Raw materials</link:label>
    <link:label id="lab_us-gaap_InventoryRawMaterials_C5220D5AB54FA627BAD73F0D030C62AB_label_en-US" xlink:label="lab_us-gaap_InventoryRawMaterials_C5220D5AB54FA627BAD73F0D030C62AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Raw Materials, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryRawMaterials" xlink:label="loc_us-gaap_InventoryRawMaterials_C5220D5AB54FA627BAD73F0D030C62AB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryRawMaterials_C5220D5AB54FA627BAD73F0D030C62AB" xlink:to="lab_us-gaap_InventoryRawMaterials_C5220D5AB54FA627BAD73F0D030C62AB" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryFinishedGoods_00D2A67B9F14E14592963F0D030CE1B4_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryFinishedGoods_00D2A67B9F14E14592963F0D030CE1B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finished goods</link:label>
    <link:label id="lab_us-gaap_InventoryFinishedGoods_00D2A67B9F14E14592963F0D030CE1B4_label_en-US" xlink:label="lab_us-gaap_InventoryFinishedGoods_00D2A67B9F14E14592963F0D030CE1B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Finished Goods, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryFinishedGoods" xlink:label="loc_us-gaap_InventoryFinishedGoods_00D2A67B9F14E14592963F0D030CE1B4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryFinishedGoods_00D2A67B9F14E14592963F0D030CE1B4" xlink:to="lab_us-gaap_InventoryFinishedGoods_00D2A67B9F14E14592963F0D030CE1B4" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryGross_3993EA90112E5D4BC79B3F0D030D5FE6_totalLabel_en-US" xlink:label="lab_us-gaap_InventoryGross_3993EA90112E5D4BC79B3F0D030D5FE6" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Inventories, gross</link:label>
    <link:label id="lab_us-gaap_InventoryGross_3993EA90112E5D4BC79B3F0D030D5FE6_label_en-US" xlink:label="lab_us-gaap_InventoryGross_3993EA90112E5D4BC79B3F0D030D5FE6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InventoryGross" xlink:label="loc_us-gaap_InventoryGross_3993EA90112E5D4BC79B3F0D030D5FE6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InventoryValuationReserves_B68839C93AF027461BBB3F0D03133F3B_negatedLabel_en-US" xlink:label="lab_us-gaap_InventoryValuationReserves_B68839C93AF027461BBB3F0D03133F3B" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Valuation reserves</link:label>
    <link:label id="lab_us-gaap_InventoryValuationReserves_B68839C93AF027461BBB3F0D03133F3B_label_en-US" xlink:label="lab_us-gaap_InventoryValuationReserves_B68839C93AF027461BBB3F0D03133F3B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory Valuation Reserves</link:label>
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    <link:label id="lab_us-gaap_InventoryNet_17B773F476613CA78ECB3F0D03150CB1_totalLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_17B773F476613CA78ECB3F0D03150CB1" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Inventories, net</link:label>
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    <link:label id="lab_us-gaap_LandImprovementsMember_840487B9474B785F5E4449AE6348F926_terseLabel_en-US" xlink:label="lab_us-gaap_LandImprovementsMember_840487B9474B785F5E4449AE6348F926" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Land Improvements [Member]</link:label>
    <link:label id="lab_us-gaap_LandImprovementsMember_840487B9474B785F5E4449AE6348F926_label_en-US" xlink:label="lab_us-gaap_LandImprovementsMember_840487B9474B785F5E4449AE6348F926" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Land Improvements [Member]</link:label>
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    <link:label id="lab_us-gaap_BuildingAndBuildingImprovementsMember_68709F2566DACF9186BA49AE6348FCB3_terseLabel_en-US" xlink:label="lab_us-gaap_BuildingAndBuildingImprovementsMember_68709F2566DACF9186BA49AE6348FCB3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Building and Building Improvements [Member]</link:label>
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    <link:label id="lab_us-gaap_FurnitureAndFixturesMember_7BAB4DE6ED7994A4BDB349AE6348ADDE_terseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesMember_7BAB4DE6ED7994A4BDB349AE6348ADDE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Furniture and Fixtures [Member]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SoftwareDevelopmentMember" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_EBBC860432FF44EB625449AE63484D42" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SoftwareDevelopmentMember_EBBC860432FF44EB625449AE63484D42" xlink:to="lab_us-gaap_SoftwareDevelopmentMember_EBBC860432FF44EB625449AE63484D42" xlink:type="arc" />
    <link:label id="lab_thr_GroupOfInvestorsAndOtherPrivateEquityFirmsMember_B4C4E7447B03CEDF8AC649AE63487C25_terseLabel_en-US" xlink:label="lab_thr_GroupOfInvestorsAndOtherPrivateEquityFirmsMember_B4C4E7447B03CEDF8AC649AE63487C25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Group of investors and other private equity firms [Member]</link:label>
    <link:label id="lab_thr_GroupOfInvestorsAndOtherPrivateEquityFirmsMember_B4C4E7447B03CEDF8AC649AE63487C25_label_en-US" xlink:label="lab_thr_GroupOfInvestorsAndOtherPrivateEquityFirmsMember_B4C4E7447B03CEDF8AC649AE63487C25" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Group of Investors and Other Private Equity Firms [Member]</link:label>
    <link:label id="lab_thr_GroupOfInvestorsAndOtherPrivateEquityFirmsMember_B4C4E7447B03CEDF8AC649AE63487C25_documentation_en-US" xlink:label="lab_thr_GroupOfInvestorsAndOtherPrivateEquityFirmsMember_B4C4E7447B03CEDF8AC649AE63487C25" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the group of investors led by entities affiliated with CHS Capital LLC and other private equity firms, which acquired the controlling interest from predecessor.</link:label>
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    <link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_79FD0BF08B795EA6E90549AE6348E989_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain_79FD0BF08B795EA6E90549AE6348E989" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Acquiree [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_79FD0BF08B795EA6E90549AE6348E989" xlink:type="locator" />
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    <link:label id="lab_thr_ThermonHoldingCorpMember_E5AE5AA4AF5BFB8740F149AE6348E5E1_documentation_en-US" xlink:label="lab_thr_ThermonHoldingCorpMember_E5AE5AA4AF5BFB8740F149AE6348E5E1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents Thermon Holding Corp., whose controlling interest is acquired by related party of the entity and because of this transaction, it became a subsidiary of the entity.</link:label>
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    <link:label id="lab_thr_NumberOfPrivateEquityFirms_4101CF4BB62B3D8A4D6849AE63571F36_terseLabel_en-US" xlink:label="lab_thr_NumberOfPrivateEquityFirms_4101CF4BB62B3D8A4D6849AE63571F36" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of other private equity firms</link:label>
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    <link:label id="lab_thr_NumberOfPrivateEquityFirms_4101CF4BB62B3D8A4D6849AE63571F36_documentation_en-US" xlink:label="lab_thr_NumberOfPrivateEquityFirms_4101CF4BB62B3D8A4D6849AE63571F36" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of private equity firms who are involved in acquiring a controlling interest in the entity.</link:label>
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    <link:label id="lab_thr_CostForSaleOfControllingInterest_35A5F387BFA9D699A01C49AE6357D020_terseLabel_en-US" xlink:label="lab_thr_CostForSaleOfControllingInterest_35A5F387BFA9D699A01C49AE6357D020" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost of selling controlling interest</link:label>
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    <link:label id="lab_thr_CostForSaleOfControllingInterest_35A5F387BFA9D699A01C49AE6357D020_documentation_en-US" xlink:label="lab_thr_CostForSaleOfControllingInterest_35A5F387BFA9D699A01C49AE6357D020" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the sale price of controlling interest in the entity.</link:label>
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