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    <link:label id="lab_lnth_LeverageRatioRangeOneMember_C2A14204E7CE6EEAA10ECDDF06C4119A_terseLabel_en-US" xlink:label="lab_lnth_LeverageRatioRangeOneMember_C2A14204E7CE6EEAA10ECDDF06C4119A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leverage Ratio Range One</link:label>
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    <link:label id="lab_us-gaap_AmortizationOfFinancingCosts_3CD36068DE24234FABBFBE630C06292C_label_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCosts_3CD36068DE24234FABBFBE630C06292C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of Debt Issuance Costs</link:label>
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    <link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_84E25DD3402A6F054080BE630C061C0F_terseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_84E25DD3402A6F054080BE630C061C0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Provision for bad debt</link:label>
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    <link:label id="lab_us-gaap_InventoryWriteDown_F434F09F43E6869A2981BE630C0653E6_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryWriteDown_F434F09F43E6869A2981BE630C0653E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Provision for excess and obsolete inventory</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensation_823048505D7230DE9EF4BE630C0644FD_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_823048505D7230DE9EF4BE630C0644FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock-based compensation</link:label>
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    <link:label id="lab_us-gaap_OtherNoncashIncomeExpense_220993E60306785AF242BE630C0703EB_negatedLabel_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_220993E60306785AF242BE630C0703EB" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_us-gaap_OtherNoncashIncomeExpense_220993E60306785AF242BE630C0703EB_label_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_220993E60306785AF242BE630C0703EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Noncash Income (Expense)</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherCurrentAssets_0BEA2FB45DF7AEA51A68BE630C07C7D8_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherCurrentAssets_0BEA2FB45DF7AEA51A68BE630C07C7D8" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other current assets</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_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_4D0008227B2D7BA12402BE630C075E65" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_EEBD9C781D213262C8A6BE630C07400E_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_EEBD9C781D213262C8A6BE630C07400E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income taxes</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_IncreaseDecreaseInAccruedIncomeTaxesPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_EEBD9C781D213262C8A6BE630C07400E" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_A33449F8B350458761EBBE630C0792E9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_3EC23EE73D4052A2367F9024D8D0434F_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_3EC23EE73D4052A2367F9024D8D0434F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_3EC23EE73D4052A2367F9024D8D0434F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_6A4B6E794BA42673B3079024D8D0813E_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_6A4B6E794BA42673B3079024D8D0813E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_6A4B6E794BA42673B3079024D8D0813E_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_6A4B6E794BA42673B3079024D8D0813E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Maturities, Repayments of Principal in Year Two</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_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_6A4B6E794BA42673B3079024D8D0813E" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_6A4B6E794BA42673B3079024D8D0813E" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_D174958B57265546418A9024D8D00CF9_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_D174958B57265546418A9024D8D00CF9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</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_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_D174958B57265546418A9024D8D00CF9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_D174958B57265546418A9024D8D00CF9" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_D174958B57265546418A9024D8D00CF9" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_D7651A7D4BA01D3F0AAA9024D8D0AEBF_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_D7651A7D4BA01D3F0AAA9024D8D0AEBF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</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_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_D7651A7D4BA01D3F0AAA9024D8D0AEBF" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_D7651A7D4BA01D3F0AAA9024D8D0AEBF" xlink:type="arc" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_34A642B719E6FA39788E9024D8D080BA" xlink:to="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_34A642B719E6FA39788E9024D8D080BA" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_5612F55ACD7DB126337D9024D8D03FF7_totalLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_5612F55ACD7DB126337D9024D8D03FF7" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total principal outstanding</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_5612F55ACD7DB126337D9024D8D03FF7_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_5612F55ACD7DB126337D9024D8D03FF7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Gross</link:label>
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    <link:label id="lab_lnth_TwoThousandAndFifteenTermFacilityMember_6E3375B11ABAE2AAACC2AF1D5D6CC715_terseLabel_en-US" xlink:label="lab_lnth_TwoThousandAndFifteenTermFacilityMember_6E3375B11ABAE2AAACC2AF1D5D6CC715" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2015 Term Facility</link:label>
    <link:label id="lab_lnth_TwoThousandAndFifteenTermFacilityMember_6E3375B11ABAE2AAACC2AF1D5D6CC715_label_en-US" xlink:label="lab_lnth_TwoThousandAndFifteenTermFacilityMember_6E3375B11ABAE2AAACC2AF1D5D6CC715" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand And Fifteen Term Facility [Member]</link:label>
    <link:label id="lab_lnth_TwoThousandAndFifteenTermFacilityMember_6E3375B11ABAE2AAACC2AF1D5D6CC715_documentation_en-US" xlink:label="lab_lnth_TwoThousandAndFifteenTermFacilityMember_6E3375B11ABAE2AAACC2AF1D5D6CC715" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two thousand and fifteen term facility.</link:label>
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    <link:label id="lab_us-gaap_RevolvingCreditFacilityMember_BE892892B3D40A0C5EB9AF1D5D6C8BC4_verboseLabel_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_BE892892B3D40A0C5EB9AF1D5D6C8BC4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Revolving Line of Credit</link:label>
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    <link:label id="lab_lnth_AssetBasedLoanFacilityMember_2701C576A1938438E7CDAF1D5D6C8F73_terseLabel_en-US" xlink:label="lab_lnth_AssetBasedLoanFacilityMember_2701C576A1938438E7CDAF1D5D6C8F73" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset Based Loan (ABL) Facility</link:label>
    <link:label id="lab_lnth_AssetBasedLoanFacilityMember_2701C576A1938438E7CDAF1D5D6C8F73_label_en-US" xlink:label="lab_lnth_AssetBasedLoanFacilityMember_2701C576A1938438E7CDAF1D5D6C8F73" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Based Loan Facility [Member]</link:label>
    <link:label id="lab_lnth_AssetBasedLoanFacilityMember_2701C576A1938438E7CDAF1D5D6C8F73_documentation_en-US" xlink:label="lab_lnth_AssetBasedLoanFacilityMember_2701C576A1938438E7CDAF1D5D6C8F73" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset based loan facility.</link:label>
    <link:loc xlink:href="lnth-20171231.xsd#lnth_AssetBasedLoanFacilityMember" xlink:label="loc_lnth_AssetBasedLoanFacilityMember_2701C576A1938438E7CDAF1D5D6C8F73" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentTerm_756D66C5B1F96152BC85AF1D5D6C839B_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_756D66C5B1F96152BC85AF1D5D6C839B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt instrument, term (in years)</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentTerm_756D66C5B1F96152BC85AF1D5D6C839B_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_756D66C5B1F96152BC85AF1D5D6C839B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Term</link:label>
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    <link:label id="lab_lnth_DebtInstrumentDiscountAmount_74280F07BD1FC3468DF6AF1D5D6CD153_terseLabel_en-US" xlink:label="lab_lnth_DebtInstrumentDiscountAmount_74280F07BD1FC3468DF6AF1D5D6CD153" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt instrument, discount amount</link:label>
    <link:label id="lab_lnth_DebtInstrumentDiscountAmount_74280F07BD1FC3468DF6AF1D5D6CD153_label_en-US" xlink:label="lab_lnth_DebtInstrumentDiscountAmount_74280F07BD1FC3468DF6AF1D5D6CD153" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument Discount Amount</link:label>
    <link:label id="lab_lnth_DebtInstrumentDiscountAmount_74280F07BD1FC3468DF6AF1D5D6CD153_documentation_en-US" xlink:label="lab_lnth_DebtInstrumentDiscountAmount_74280F07BD1FC3468DF6AF1D5D6CD153" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt instrument discount amount.</link:label>
    <link:loc xlink:href="lnth-20171231.xsd#lnth_DebtInstrumentDiscountAmount" xlink:label="loc_lnth_DebtInstrumentDiscountAmount_74280F07BD1FC3468DF6AF1D5D6CD153" xlink:type="locator" />
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    <link:label id="lab_lnth_DebtInstrumentAdditionalBorrowingCapacity_50D54C7B302C938F4ED7AF1D5D6C080F_terseLabel_en-US" xlink:label="lab_lnth_DebtInstrumentAdditionalBorrowingCapacity_50D54C7B302C938F4ED7AF1D5D6C080F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase in aggregate principal amount</link:label>
    <link:label id="lab_lnth_DebtInstrumentAdditionalBorrowingCapacity_50D54C7B302C938F4ED7AF1D5D6C080F_label_en-US" xlink:label="lab_lnth_DebtInstrumentAdditionalBorrowingCapacity_50D54C7B302C938F4ED7AF1D5D6C080F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument Additional Borrowing Capacity</link:label>
    <link:label id="lab_lnth_DebtInstrumentAdditionalBorrowingCapacity_50D54C7B302C938F4ED7AF1D5D6C080F_documentation_en-US" xlink:label="lab_lnth_DebtInstrumentAdditionalBorrowingCapacity_50D54C7B302C938F4ED7AF1D5D6C080F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt instrument additional borrowing capacity.</link:label>
    <link:loc xlink:href="lnth-20171231.xsd#lnth_DebtInstrumentAdditionalBorrowingCapacity" xlink:label="loc_lnth_DebtInstrumentAdditionalBorrowingCapacity_50D54C7B302C938F4ED7AF1D5D6C080F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RepaymentsOfDebt_873EAF71E344FF6509C9AF1D5D6CF77F_terseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfDebt_873EAF71E344FF6509C9AF1D5D6CF77F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash paid during the execution of refinancing</link:label>
    <link:label id="lab_us-gaap_RepaymentsOfDebt_873EAF71E344FF6509C9AF1D5D6CF77F_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfDebt_873EAF71E344FF6509C9AF1D5D6CF77F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repayments of Debt</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_A53C2EB4151EE9774120AF1D5D6CC20E_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_A53C2EB4151EE9774120AF1D5D6CC20E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate principal amount outstanding</link:label>
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    <link:label id="lab_lnth_CostAssociatedWithDebtModification_8AC1FB132BAD9E790753AF1D5D6C74EA_terseLabel_en-US" xlink:label="lab_lnth_CostAssociatedWithDebtModification_8AC1FB132BAD9E790753AF1D5D6C74EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Third-party costs associated with modified debt</link:label>
    <link:label id="lab_lnth_CostAssociatedWithDebtModification_8AC1FB132BAD9E790753AF1D5D6C74EA_label_en-US" xlink:label="lab_lnth_CostAssociatedWithDebtModification_8AC1FB132BAD9E790753AF1D5D6C74EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost Associated With Debt Modification</link:label>
    <link:label id="lab_lnth_CostAssociatedWithDebtModification_8AC1FB132BAD9E790753AF1D5D6C74EA_documentation_en-US" xlink:label="lab_lnth_CostAssociatedWithDebtModification_8AC1FB132BAD9E790753AF1D5D6C74EA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cost associated with debt modification.</link:label>
    <link:loc xlink:href="lnth-20171231.xsd#lnth_CostAssociatedWithDebtModification" xlink:label="loc_lnth_CostAssociatedWithDebtModification_8AC1FB132BAD9E790753AF1D5D6C74EA" xlink:type="locator" />
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    <link:label id="lab_lnth_CapitalizedDebtIssuanceCost_30F9AC5915C90B23D04AAF1D5D6C6C51_terseLabel_en-US" xlink:label="lab_lnth_CapitalizedDebtIssuanceCost_30F9AC5915C90B23D04AAF1D5D6C6C51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt issuance costs</link:label>
    <link:label id="lab_lnth_CapitalizedDebtIssuanceCost_30F9AC5915C90B23D04AAF1D5D6C6C51_label_en-US" xlink:label="lab_lnth_CapitalizedDebtIssuanceCost_30F9AC5915C90B23D04AAF1D5D6C6C51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capitalized Debt Issuance Cost</link:label>
    <link:label id="lab_lnth_CapitalizedDebtIssuanceCost_30F9AC5915C90B23D04AAF1D5D6C6C51_documentation_en-US" xlink:label="lab_lnth_CapitalizedDebtIssuanceCost_30F9AC5915C90B23D04AAF1D5D6C6C51" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Capitalized debt issuance cost.</link:label>
    <link:loc xlink:href="lnth-20171231.xsd#lnth_CapitalizedDebtIssuanceCost" xlink:label="loc_lnth_CapitalizedDebtIssuanceCost_30F9AC5915C90B23D04AAF1D5D6C6C51" xlink:type="locator" />
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    <link:label id="lab_lnth_CostAssociatedWithDebtRepricing_5ED303DF8CFD3F52DC1BAF1D5D6C6F3F_terseLabel_en-US" xlink:label="lab_lnth_CostAssociatedWithDebtRepricing_5ED303DF8CFD3F52DC1BAF1D5D6C6F3F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost associated with debt repricing</link:label>
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    <link:loc xlink:href="lnth-20171231.xsd#lnth_CostAssociatedWithDebtRepricing" xlink:label="loc_lnth_CostAssociatedWithDebtRepricing_5ED303DF8CFD3F52DC1BAF1D5D6C6F3F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_05DDC50B394AE85B4002CB0AC5F88F2D_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_05DDC50B394AE85B4002CB0AC5F88F2D" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_05DDC50B394AE85B4002CB0AC5F88F2D" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_720091BE68B7963E6DD2CB0AC5F8CE59" xlink:type="locator" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_DE5208269F0E44CA6F80CB0AC5F829C4" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_DE5208269F0E44CA6F80CB0AC5F829C4" xlink:type="arc" />
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    <link:label id="lab_lnth_Q22019andThereafterMember_AF2B1FA1DEE036E3CE9632377ACACEF2_documentation_en-US" xlink:label="lab_lnth_Q22019andThereafterMember_AF2B1FA1DEE036E3CE9632377ACACEF2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Q2 2019 and Thereafter [Member]</link:label>
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    <link:label id="lab_lnth_TwoThousandAndSeventeenFacilityMember_E99C554ED2359E006DDD32377ACB6F56_terseLabel_en-US" xlink:label="lab_lnth_TwoThousandAndSeventeenFacilityMember_E99C554ED2359E006DDD32377ACB6F56" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2017 Facility</link:label>
    <link:label id="lab_lnth_TwoThousandAndSeventeenFacilityMember_E99C554ED2359E006DDD32377ACB6F56_label_en-US" xlink:label="lab_lnth_TwoThousandAndSeventeenFacilityMember_E99C554ED2359E006DDD32377ACB6F56" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Two Thousand And Seventeen Facility [Member]</link:label>
    <link:label id="lab_lnth_TwoThousandAndSeventeenFacilityMember_E99C554ED2359E006DDD32377ACB6F56_documentation_en-US" xlink:label="lab_lnth_TwoThousandAndSeventeenFacilityMember_E99C554ED2359E006DDD32377ACB6F56" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Two thousand and seventeen facility.</link:label>
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    <link:label id="lab_us-gaap_SubsequentEventTypeDomain_4EC4D1AC8E960FD45D8C0A9C6AA202B4_label_en-US" xlink:label="lab_us-gaap_SubsequentEventTypeDomain_4EC4D1AC8E960FD45D8C0A9C6AA202B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Event Type [Domain]</link:label>
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