

<!--XBRL Document Created with Wdesk from Workiva-->
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    <link:label id="lab_us-gaap_DebtInstrumentTable_B969D5FD1E6DF20C983FDE2DCF1FCEDF_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable_B969D5FD1E6DF20C983FDE2DCF1FCEDF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Long-term Debt Instruments [Table]</link:label>
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    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_F6E2B74A98072523B638DE2DCF1F8785_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_F6E2B74A98072523B638DE2DCF1F8785" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_F6E2B74A98072523B638DE2DCF1F8785" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_6C65BBA720689F430E5DDE2DCF1F5087_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_6C65BBA720689F430E5DDE2DCF1F5087" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Domain]</link:label>
    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_6C65BBA720689F430E5DDE2DCF1F5087_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_6C65BBA720689F430E5DDE2DCF1F5087" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_6C65BBA720689F430E5DDE2DCF1F5087" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_6C65BBA720689F430E5DDE2DCF1F5087" xlink:to="lab_us-gaap_LongtermDebtTypeDomain_6C65BBA720689F430E5DDE2DCF1F5087" xlink:type="arc" />
    <link:label id="lab_us-gaap_SecuredDebtMember_38B3EE908D49214D697ADE2DCF1FA99D_terseLabel_en-US" xlink:label="lab_us-gaap_SecuredDebtMember_38B3EE908D49214D697ADE2DCF1FA99D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivables Facility [Member]</link:label>
    <link:label id="lab_us-gaap_SecuredDebtMember_38B3EE908D49214D697ADE2DCF1FA99D_label_en-US" xlink:label="lab_us-gaap_SecuredDebtMember_38B3EE908D49214D697ADE2DCF1FA99D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Secured Debt [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SecuredDebtMember" xlink:label="loc_us-gaap_SecuredDebtMember_38B3EE908D49214D697ADE2DCF1FA99D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuredDebtMember_38B3EE908D49214D697ADE2DCF1FA99D" xlink:to="lab_us-gaap_SecuredDebtMember_38B3EE908D49214D697ADE2DCF1FA99D" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_72EBF4990AF237EE9AA2DE2DCF1F2DD3_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_72EBF4990AF237EE9AA2DE2DCF1F2DD3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_72EBF4990AF237EE9AA2DE2DCF1F2DD3_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_72EBF4990AF237EE9AA2DE2DCF1F2DD3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_72EBF4990AF237EE9AA2DE2DCF1F2DD3" xlink:type="locator" />
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    <link:label id="lab_trs_SecuredDebtMaximumBorrowingCapacity_EE1823D7BC5AD28934E5DE2DCF1FBDF7_terseLabel_en-US" xlink:label="lab_trs_SecuredDebtMaximumBorrowingCapacity_EE1823D7BC5AD28934E5DE2DCF1FBDF7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Secured debt, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_trs_SecuredDebtMaximumBorrowingCapacity_EE1823D7BC5AD28934E5DE2DCF1FBDF7_label_en-US" xlink:label="lab_trs_SecuredDebtMaximumBorrowingCapacity_EE1823D7BC5AD28934E5DE2DCF1FBDF7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Secured debt, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_trs_SecuredDebtMaximumBorrowingCapacity_EE1823D7BC5AD28934E5DE2DCF1FBDF7_documentation_en-US" xlink:label="lab_trs_SecuredDebtMaximumBorrowingCapacity_EE1823D7BC5AD28934E5DE2DCF1FBDF7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum borrowing capacity under the receivables facility debt arrangement.</link:label>
    <link:loc xlink:href="trs-20180331.xsd#trs_SecuredDebtMaximumBorrowingCapacity" xlink:label="loc_trs_SecuredDebtMaximumBorrowingCapacity_EE1823D7BC5AD28934E5DE2DCF1FBDF7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_32D9EAC3A606B0CB784CDE2DCF1F6622_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_32D9EAC3A606B0CB784CDE2DCF1F6622" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Basis Spread on Variable Rate</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_32D9EAC3A606B0CB784CDE2DCF1F6622_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_32D9EAC3A606B0CB784CDE2DCF1F6622" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Basis Spread on Variable Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_32D9EAC3A606B0CB784CDE2DCF1F6622" xlink:type="locator" />
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    <link:label id="lab_trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage_CC0A1B0B1DA25AC9ADE2DE2DCF1F8F8C_terseLabel_en-US" xlink:label="lab_trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage_CC0A1B0B1DA25AC9ADE2DE2DCF1F8F8C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Unused Borrowing Capacity, Fee percentage</link:label>
    <link:label id="lab_trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage_CC0A1B0B1DA25AC9ADE2DE2DCF1F8F8C_label_en-US" xlink:label="lab_trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage_CC0A1B0B1DA25AC9ADE2DE2DCF1F8F8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Unused Borrowing Capacity, Fee percentage</link:label>
    <link:label id="lab_trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage_CC0A1B0B1DA25AC9ADE2DE2DCF1F8F8C_documentation_en-US" xlink:label="lab_trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage_CC0A1B0B1DA25AC9ADE2DE2DCF1F8F8C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Instrument, Unused Borrowing Capacity, Fee percentage</link:label>
    <link:loc xlink:href="trs-20180331.xsd#trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage" xlink:label="loc_trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage_CC0A1B0B1DA25AC9ADE2DE2DCF1F8F8C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage_CC0A1B0B1DA25AC9ADE2DE2DCF1F8F8C" xlink:to="lab_trs_DebtInstrumentUnusedBorrowingCapacityFeePercentage_CC0A1B0B1DA25AC9ADE2DE2DCF1F8F8C" xlink:type="arc" />
    <link:label id="lab_us-gaap_SecuredDebt_08CF60A6EDE95167759ADE2DCF1F2C56_terseLabel_en-US" xlink:label="lab_us-gaap_SecuredDebt_08CF60A6EDE95167759ADE2DCF1F2C56" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Secured Debt</link:label>
    <link:label id="lab_us-gaap_SecuredDebt_08CF60A6EDE95167759ADE2DCF1F2C56_label_en-US" xlink:label="lab_us-gaap_SecuredDebt_08CF60A6EDE95167759ADE2DCF1F2C56" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Secured Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SecuredDebt" xlink:label="loc_us-gaap_SecuredDebt_08CF60A6EDE95167759ADE2DCF1F2C56" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuredDebt_08CF60A6EDE95167759ADE2DCF1F2C56" xlink:to="lab_us-gaap_SecuredDebt_08CF60A6EDE95167759ADE2DCF1F2C56" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_1CA7506338C8EDA617E7DE2DCF1F9268_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_1CA7506338C8EDA617E7DE2DCF1F9268" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Receivables facility debt available but not utilized</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_1CA7506338C8EDA617E7DE2DCF1F9268_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_1CA7506338C8EDA617E7DE2DCF1F9268" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Unused Borrowing Capacity, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount" xlink:label="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_1CA7506338C8EDA617E7DE2DCF1F9268" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_1CA7506338C8EDA617E7DE2DCF1F9268" xlink:to="lab_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_1CA7506338C8EDA617E7DE2DCF1F9268" xlink:type="arc" />
    <link:label id="lab_trs_ReceivablesFacililtyDebtAggregateCosts_8665979B72209C7A1D34DE2DCF1FE41E_terseLabel_en-US" xlink:label="lab_trs_ReceivablesFacililtyDebtAggregateCosts_8665979B72209C7A1D34DE2DCF1FE41E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Receivables facililty, debt aggregate costs</link:label>
    <link:label id="lab_trs_ReceivablesFacililtyDebtAggregateCosts_8665979B72209C7A1D34DE2DCF1FE41E_label_en-US" xlink:label="lab_trs_ReceivablesFacililtyDebtAggregateCosts_8665979B72209C7A1D34DE2DCF1FE41E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivables Facililty, Debt Aggregate Costs</link:label>
    <link:label id="lab_trs_ReceivablesFacililtyDebtAggregateCosts_8665979B72209C7A1D34DE2DCF1FE41E_documentation_en-US" xlink:label="lab_trs_ReceivablesFacililtyDebtAggregateCosts_8665979B72209C7A1D34DE2DCF1FE41E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of the fee that accompanies borrowing money under the debt instrument.</link:label>
    <link:loc xlink:href="trs-20180331.xsd#trs_ReceivablesFacililtyDebtAggregateCosts" xlink:label="loc_trs_ReceivablesFacililtyDebtAggregateCosts_8665979B72209C7A1D34DE2DCF1FE41E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentMaturityDate_501D1496DAFB3596AF85DE2DCF1FD9E8_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentMaturityDate_501D1496DAFB3596AF85DE2DCF1FD9E8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Maturity Date</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensation_E80FD984FB1606658DDDF3FB991552E8_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_E80FD984FB1606658DDDF3FB991552E8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-cash compensation expense</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_E841B1673EF492F4264AF3FB99153B40_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_E841B1673EF492F4264AF3FB99153B40" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from issuance of senior notes</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_4A5924A75F667650B634F3FB9915952E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromLinesOfCredit_D1CFD8C2D971CF636482F3FB9915137F_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_D1CFD8C2D971CF636482F3FB9915137F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from borrowings on revolving credit and accounts receivable facilities</link:label>
    <link:label id="lab_us-gaap_ProceedsFromLinesOfCredit_D1CFD8C2D971CF636482F3FB9915137F_label_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_D1CFD8C2D971CF636482F3FB9915137F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Lines of Credit</link:label>
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    <link:label id="lab_trs_TermloanAfacilityMember_1CDA787E51A624A45066DE2AB5A4B0DC_terseLabel_en-US" xlink:label="lab_trs_TermloanAfacilityMember_1CDA787E51A624A45066DE2AB5A4B0DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">term loan A facility [Member]</link:label>
    <link:label id="lab_trs_TermloanAfacilityMember_1CDA787E51A624A45066DE2AB5A4B0DC_label_en-US" xlink:label="lab_trs_TermloanAfacilityMember_1CDA787E51A624A45066DE2AB5A4B0DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">term loan A facility [Member]</link:label>
    <link:label id="lab_trs_TermloanAfacilityMember_1CDA787E51A624A45066DE2AB5A4B0DC_documentation_en-US" xlink:label="lab_trs_TermloanAfacilityMember_1CDA787E51A624A45066DE2AB5A4B0DC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">term loan A facility [Member]</link:label>
    <link:loc xlink:href="trs-20180331.xsd#trs_TermloanAfacilityMember" xlink:label="loc_trs_TermloanAfacilityMember_1CDA787E51A624A45066DE2AB5A4B0DC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_TermloanAfacilityMember_1CDA787E51A624A45066DE2AB5A4B0DC" xlink:to="lab_trs_TermloanAfacilityMember_1CDA787E51A624A45066DE2AB5A4B0DC" xlink:type="arc" />
    <link:label id="lab_us-gaap_LetterOfCreditMember_B7BFF986274D7C1E821FDE2AB5A462DB_terseLabel_en-US" xlink:label="lab_us-gaap_LetterOfCreditMember_B7BFF986274D7C1E821FDE2AB5A462DB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of credit [Member]</link:label>
    <link:label id="lab_us-gaap_LetterOfCreditMember_B7BFF986274D7C1E821FDE2AB5A462DB_label_en-US" xlink:label="lab_us-gaap_LetterOfCreditMember_B7BFF986274D7C1E821FDE2AB5A462DB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letter of Credit [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="loc_us-gaap_LetterOfCreditMember_B7BFF986274D7C1E821FDE2AB5A462DB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LetterOfCreditMember_B7BFF986274D7C1E821FDE2AB5A462DB" xlink:to="lab_us-gaap_LetterOfCreditMember_B7BFF986274D7C1E821FDE2AB5A462DB" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsOfFinancingCosts_0AD15A4A236C734CBDBADE2AB5A4A851_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfFinancingCosts_0AD15A4A236C734CBDBADE2AB5A4A851" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payments of Financing Costs</link:label>
    <link:label id="lab_us-gaap_PaymentsOfFinancingCosts_0AD15A4A236C734CBDBADE2AB5A4A851_label_en-US" xlink:label="lab_us-gaap_PaymentsOfFinancingCosts_0AD15A4A236C734CBDBADE2AB5A4A851" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments of Financing Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsOfFinancingCosts" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts_0AD15A4A236C734CBDBADE2AB5A4A851" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsOfFinancingCosts_0AD15A4A236C734CBDBADE2AB5A4A851" xlink:to="lab_us-gaap_PaymentsOfFinancingCosts_0AD15A4A236C734CBDBADE2AB5A4A851" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredFinanceCostsNoncurrentNet_CAEB32BFB3ADAF189C85DE2AB5A4E168_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsNoncurrentNet_CAEB32BFB3ADAF189C85DE2AB5A4E168" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Issuance Costs, Noncurrent, Net</link:label>
    <link:label id="lab_us-gaap_DeferredFinanceCostsNoncurrentNet_CAEB32BFB3ADAF189C85DE2AB5A4E168_label_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsNoncurrentNet_CAEB32BFB3ADAF189C85DE2AB5A4E168" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Issuance Costs, Noncurrent, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredFinanceCostsNoncurrentNet" xlink:label="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_CAEB32BFB3ADAF189C85DE2AB5A4E168" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_CAEB32BFB3ADAF189C85DE2AB5A4E168" xlink:to="lab_us-gaap_DeferredFinanceCostsNoncurrentNet_CAEB32BFB3ADAF189C85DE2AB5A4E168" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_088B4F40DCD05028D6A8DE2AB5A4289C_terseLabel_en-US" xlink:label="lab_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_088B4F40DCD05028D6A8DE2AB5A4289C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Related Commitment Fees and Debt Issuance Costs</link:label>
    <link:label id="lab_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_088B4F40DCD05028D6A8DE2AB5A4289C_label_en-US" xlink:label="lab_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_088B4F40DCD05028D6A8DE2AB5A4289C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Related Commitment Fees and Debt Issuance Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts" xlink:label="loc_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_088B4F40DCD05028D6A8DE2AB5A4289C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_088B4F40DCD05028D6A8DE2AB5A4289C" xlink:to="lab_us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts_088B4F40DCD05028D6A8DE2AB5A4289C" xlink:type="arc" />
    <link:label id="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_A6343802BDE9B6B595E1DE2AB5A47E00_terseLabel_en-US" xlink:label="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_A6343802BDE9B6B595E1DE2AB5A47E00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Write off of Deferred Debt Issuance Cost</link:label>
    <link:label id="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_A6343802BDE9B6B595E1DE2AB5A47E00_label_en-US" xlink:label="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_A6343802BDE9B6B595E1DE2AB5A47E00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Write off of Deferred Debt Issuance Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_A6343802BDE9B6B595E1DE2AB5A47E00" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_A6343802BDE9B6B595E1DE2AB5A47E00" xlink:to="lab_us-gaap_WriteOffOfDeferredDebtIssuanceCost_A6343802BDE9B6B595E1DE2AB5A47E00" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_2A96F84696FB86EA4F6BDE2AB5A4930C_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_2A96F84696FB86EA4F6BDE2AB5A4930C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility, Capacity Available for Foreign Revolver Loans</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_2A96F84696FB86EA4F6BDE2AB5A4930C_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_2A96F84696FB86EA4F6BDE2AB5A4930C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases" xlink:label="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_2A96F84696FB86EA4F6BDE2AB5A4930C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_2A96F84696FB86EA4F6BDE2AB5A4930C" xlink:to="lab_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_2A96F84696FB86EA4F6BDE2AB5A4930C" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_747237A1FB3C0246B4E7DE2AB5A45531_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_747237A1FB3C0246B4E7DE2AB5A45531" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_747237A1FB3C0246B4E7DE2AB5A45531_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_747237A1FB3C0246B4E7DE2AB5A45531" 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>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_747237A1FB3C0246B4E7DE2AB5A45531" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_747237A1FB3C0246B4E7DE2AB5A45531" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_747237A1FB3C0246B4E7DE2AB5A45531" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_B1FE311A872D339E5338DE2AB5A449A5_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_B1FE311A872D339E5338DE2AB5A449A5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_B1FE311A872D339E5338DE2AB5A449A5_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_B1FE311A872D339E5338DE2AB5A449A5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_B1FE311A872D339E5338DE2AB5A449A5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount_B1FE311A872D339E5338DE2AB5A449A5" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount_B1FE311A872D339E5338DE2AB5A449A5" xlink:type="arc" />
    <link:label id="lab_trs_IncrementalDebtCommitmentsCapacity_C744478AEDD332AA796DDE2AB5A482C0_terseLabel_en-US" xlink:label="lab_trs_IncrementalDebtCommitmentsCapacity_C744478AEDD332AA796DDE2AB5A482C0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Incremental debt commitments capacity</link:label>
    <link:label id="lab_trs_IncrementalDebtCommitmentsCapacity_C744478AEDD332AA796DDE2AB5A482C0_label_en-US" xlink:label="lab_trs_IncrementalDebtCommitmentsCapacity_C744478AEDD332AA796DDE2AB5A482C0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Incremental debt commitments capacity</link:label>
    <link:label id="lab_trs_IncrementalDebtCommitmentsCapacity_C744478AEDD332AA796DDE2AB5A482C0_documentation_en-US" xlink:label="lab_trs_IncrementalDebtCommitmentsCapacity_C744478AEDD332AA796DDE2AB5A482C0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Incremental debt commitments capacity.</link:label>
    <link:loc xlink:href="trs-20180331.xsd#trs_IncrementalDebtCommitmentsCapacity" xlink:label="loc_trs_IncrementalDebtCommitmentsCapacity_C744478AEDD332AA796DDE2AB5A482C0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_IncrementalDebtCommitmentsCapacity_C744478AEDD332AA796DDE2AB5A482C0" xlink:to="lab_trs_IncrementalDebtCommitmentsCapacity_C744478AEDD332AA796DDE2AB5A482C0" xlink:type="arc" />
    <link:label id="lab_trs_NetLeverageRatio_9A46A714705D85BFAAF9DE2AB5A4239F_terseLabel_en-US" xlink:label="lab_trs_NetLeverageRatio_9A46A714705D85BFAAF9DE2AB5A4239F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net leverage ratio</link:label>
    <link:label id="lab_trs_NetLeverageRatio_9A46A714705D85BFAAF9DE2AB5A4239F_label_en-US" xlink:label="lab_trs_NetLeverageRatio_9A46A714705D85BFAAF9DE2AB5A4239F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net leverage ratio</link:label>
    <link:label id="lab_trs_NetLeverageRatio_9A46A714705D85BFAAF9DE2AB5A4239F_documentation_en-US" xlink:label="lab_trs_NetLeverageRatio_9A46A714705D85BFAAF9DE2AB5A4239F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Net leverage ratio, as defined</link:label>
    <link:loc xlink:href="trs-20180331.xsd#trs_NetLeverageRatio" xlink:label="loc_trs_NetLeverageRatio_9A46A714705D85BFAAF9DE2AB5A4239F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_NetLeverageRatio_9A46A714705D85BFAAF9DE2AB5A4239F" xlink:to="lab_trs_NetLeverageRatio_9A46A714705D85BFAAF9DE2AB5A4239F" xlink:type="arc" />
    <link:label id="lab_trs_LetterOfCreditMaximumBorrowingCapacity_6F1E279DC12B31B84045DE2AB5A4DE00_terseLabel_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_6F1E279DC12B31B84045DE2AB5A4DE00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of Credit, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_trs_LetterOfCreditMaximumBorrowingCapacity_6F1E279DC12B31B84045DE2AB5A4DE00_label_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_6F1E279DC12B31B84045DE2AB5A4DE00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letter of Credit, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_trs_LetterOfCreditMaximumBorrowingCapacity_6F1E279DC12B31B84045DE2AB5A4DE00_documentation_en-US" xlink:label="lab_trs_LetterOfCreditMaximumBorrowingCapacity_6F1E279DC12B31B84045DE2AB5A4DE00" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum borrowing capacity under the letters of credit.</link:label>
    <link:loc xlink:href="trs-20180331.xsd#trs_LetterOfCreditMaximumBorrowingCapacity" xlink:label="loc_trs_LetterOfCreditMaximumBorrowingCapacity_6F1E279DC12B31B84045DE2AB5A4DE00" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_trs_LetterOfCreditMaximumBorrowingCapacity_6F1E279DC12B31B84045DE2AB5A4DE00" xlink:to="lab_trs_LetterOfCreditMaximumBorrowingCapacity_6F1E279DC12B31B84045DE2AB5A4DE00" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCredit_EE810D2C76E89238D0ADDE2AB5A481E8_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit_EE810D2C76E89238D0ADDE2AB5A481E8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility, Amount Outstanding</link:label>
    <link:label id="lab_us-gaap_LineOfCredit_EE810D2C76E89238D0ADDE2AB5A481E8_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_EE810D2C76E89238D0ADDE2AB5A481E8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Line of Credit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_EE810D2C76E89238D0ADDE2AB5A481E8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCredit_EE810D2C76E89238D0ADDE2AB5A481E8" xlink:to="lab_us-gaap_LineOfCredit_EE810D2C76E89238D0ADDE2AB5A481E8" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_E2054CB22C4C271237E2DE2AB5A4F6B3_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_E2054CB22C4C271237E2DE2AB5A4F6B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility, Remaining Borrowing Capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_E2054CB22C4C271237E2DE2AB5A4F6B3_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_E2054CB22C4C271237E2DE2AB5A4F6B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Remaining Borrowing Capacity</link:label>
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