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    <link:label id="lab_us-gaap_MinimumMember_85350D384BA846F25283A5515B0BB68B_terseLabel_en-US" xlink:label="lab_us-gaap_MinimumMember_85350D384BA846F25283A5515B0BB68B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum</link:label>
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    <link:label id="lab_us-gaap_MaximumMember_10D76C32A0E9D97CA978A5515B0B63AA_terseLabel_en-US" xlink:label="lab_us-gaap_MaximumMember_10D76C32A0E9D97CA978A5515B0B63AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum</link:label>
    <link:label id="lab_us-gaap_MaximumMember_10D76C32A0E9D97CA978A5515B0B63AA_label_en-US" xlink:label="lab_us-gaap_MaximumMember_10D76C32A0E9D97CA978A5515B0B63AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum [Member]</link:label>
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    <link:label id="lab_bdc_RevolvingCreditFacilityMatureTwoThousandTwentyTwoMember_982DA2BDBE8FE409E71CA5515B0BE1C2_terseLabel_en-US" xlink:label="lab_bdc_RevolvingCreditFacilityMatureTwoThousandTwentyTwoMember_982DA2BDBE8FE409E71CA5515B0BE1C2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving credit agreement due 2022</link:label>
    <link:label id="lab_bdc_RevolvingCreditFacilityMatureTwoThousandTwentyTwoMember_982DA2BDBE8FE409E71CA5515B0BE1C2_label_en-US" xlink:label="lab_bdc_RevolvingCreditFacilityMatureTwoThousandTwentyTwoMember_982DA2BDBE8FE409E71CA5515B0BE1C2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility Mature Two Thousand Twenty Two [Member]</link:label>
    <link:label id="lab_bdc_RevolvingCreditFacilityMatureTwoThousandTwentyTwoMember_982DA2BDBE8FE409E71CA5515B0BE1C2_documentation_en-US" xlink:label="lab_bdc_RevolvingCreditFacilityMatureTwoThousandTwentyTwoMember_982DA2BDBE8FE409E71CA5515B0BE1C2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility Mature Two Thousand Twenty Two [Member]</link:label>
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    <link:label id="lab_bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember_73BB7082BF80E912B4B1A5515B0B2064_label_en-US" xlink:label="lab_bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember_73BB7082BF80E912B4B1A5515B0B2064" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Point Two Five Percent Senior Subordinated Notes Due Two Thousand Twenty Four [Member]</link:label>
    <link:label id="lab_bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember_73BB7082BF80E912B4B1A5515B0B2064_documentation_en-US" xlink:label="lab_bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember_73BB7082BF80E912B4B1A5515B0B2064" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Point Two Five Percent Senior Subordinated Notes Due Two Thousand Twenty Four [Member]</link:label>
    <link:loc xlink:href="bdc-20170702.xsd#bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember" xlink:label="loc_bdc_FivePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandTwentyFourMember_73BB7082BF80E912B4B1A5515B0B2064" xlink:type="locator" />
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    <link:label id="lab_bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember_C343311E60E0552AE7F6A5515B0B7531_terseLabel_en-US" xlink:label="lab_bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember_C343311E60E0552AE7F6A5515B0B7531" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5.50% Senior subordinated notes due 2023</link:label>
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    <link:label id="lab_bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember_C343311E60E0552AE7F6A5515B0B7531_documentation_en-US" xlink:label="lab_bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember_C343311E60E0552AE7F6A5515B0B7531" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Point Five Zero Percent Senior Subordinated Notes Due Two Thousand Twenty Three [Member]</link:label>
    <link:loc xlink:href="bdc-20170702.xsd#bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember" xlink:label="loc_bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyThreeMember_C343311E60E0552AE7F6A5515B0B7531" xlink:type="locator" />
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    <link:label id="lab_bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyTwoMember_63498DF3A57AF54A4BFFA5515B0B5EC7_terseLabel_en-US" xlink:label="lab_bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyTwoMember_63498DF3A57AF54A4BFFA5515B0B5EC7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5.50% Senior subordinated notes due 2022</link:label>
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    <link:label id="lab_bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyTwoMember_63498DF3A57AF54A4BFFA5515B0B5EC7_documentation_en-US" xlink:label="lab_bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyTwoMember_63498DF3A57AF54A4BFFA5515B0B5EC7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Point Five Zero Percent Senior Subordinated Notes Due Two Thousand Twenty Two [Member]</link:label>
    <link:loc xlink:href="bdc-20170702.xsd#bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyTwoMember" xlink:label="loc_bdc_FivePointFiveZeroPercentSeniorSubordinatedNotesDueTwoThousandTwentyTwoMember_63498DF3A57AF54A4BFFA5515B0B5EC7" xlink:type="locator" />
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    <link:label id="lab_bdc_NinePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandNineteenMember_796017581168AF76A6D2A5515B0B261E_terseLabel_en-US" xlink:label="lab_bdc_NinePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandNineteenMember_796017581168AF76A6D2A5515B0B261E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">9.25% Senior subordinated notes due 2019</link:label>
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    <link:label id="lab_bdc_NinePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandNineteenMember_796017581168AF76A6D2A5515B0B261E_documentation_en-US" xlink:label="lab_bdc_NinePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandNineteenMember_796017581168AF76A6D2A5515B0B261E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Nine Point Two Five Percent Senior Subordinated Notes Due Two Thousand Nineteen [Member]</link:label>
    <link:loc xlink:href="bdc-20170702.xsd#bdc_NinePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandNineteenMember" xlink:label="loc_bdc_NinePointTwoFivePercentSeniorSubordinatedNotesDueTwoThousandNineteenMember_796017581168AF76A6D2A5515B0B261E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SeniorSubordinatedNotesMember_21F8F3D27321DE8D610BA5515B0B4B72_terseLabel_en-US" xlink:label="lab_us-gaap_SeniorSubordinatedNotesMember_21F8F3D27321DE8D610BA5515B0B4B72" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Senior Subordinated Notes</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentLineItems_12D9D8BC7C3EF76BC360A5515B0BEBC4_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_12D9D8BC7C3EF76BC360A5515B0BEBC4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</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_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_12D9D8BC7C3EF76BC360A5515B0BEBC4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_9C4B4C98C683AEDB01C1A5515B0BFE0F_verboseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_9C4B4C98C683AEDB01C1A5515B0BFE0F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Line of credit facility, maximum borrowing capacity</link:label>
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    <link:label id="lab_bdc_DepositorySharesMember_1C4CE6DED1C4637D76FFA5515AA911E7_label_en-US" xlink:label="lab_bdc_DepositorySharesMember_1C4CE6DED1C4637D76FFA5515AA911E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depository Shares [Member]</link:label>
    <link:label id="lab_bdc_DepositorySharesMember_1C4CE6DED1C4637D76FFA5515AA911E7_documentation_en-US" xlink:label="lab_bdc_DepositorySharesMember_1C4CE6DED1C4637D76FFA5515AA911E7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Depository Shares [Member]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bdc_DepositorySharesMember_1C4CE6DED1C4637D76FFA5515AA911E7" xlink:to="lab_bdc_DepositorySharesMember_1C4CE6DED1C4637D76FFA5515AA911E7" xlink:type="arc" />
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    <link:label id="lab_bdc_SixPointSevenFivePercentageSeriesBMandatoryConvertiblePreferredStockMember_216C05581D592267981CA5515AA9300C_label_en-US" xlink:label="lab_bdc_SixPointSevenFivePercentageSeriesBMandatoryConvertiblePreferredStockMember_216C05581D592267981CA5515AA9300C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Point Seven Five Percentage Series B Mandatory Convertible Preferred Stock [Member]</link:label>
    <link:label id="lab_bdc_SixPointSevenFivePercentageSeriesBMandatoryConvertiblePreferredStockMember_216C05581D592267981CA5515AA9300C_documentation_en-US" xlink:label="lab_bdc_SixPointSevenFivePercentageSeriesBMandatoryConvertiblePreferredStockMember_216C05581D592267981CA5515AA9300C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six point seven five percentage series B mandatory convertible preferred stock.</link:label>
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    <link:label id="lab_us-gaap_ClassOfStockLineItems_FE37DB46D92BEF7A6BBAA5515AA93C43_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfStockLineItems_FE37DB46D92BEF7A6BBAA5515AA93C43" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Stock [Line Items]</link:label>
    <link:label id="lab_us-gaap_ClassOfStockLineItems_FE37DB46D92BEF7A6BBAA5515AA93C43_label_en-US" xlink:label="lab_us-gaap_ClassOfStockLineItems_FE37DB46D92BEF7A6BBAA5515AA93C43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Stock [Line Items]</link:label>
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    <link:label id="lab_us-gaap_PreferredStockSharesIssued_E19BA001503F53BD5808A5515AA96ADC_label_en-US" xlink:label="lab_us-gaap_PreferredStockSharesIssued_E19BA001503F53BD5808A5515AA96ADC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock, Shares Issued</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaap_PreferredStockSharesIssued_E19BA001503F53BD5808A5515AA96ADC" xlink:type="locator" />
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    <link:label id="lab_bdc_PreferredStockOwnershipInterest_81E7E2C8A30458C4EE7AA5515AA9502E_terseLabel_en-US" xlink:label="lab_bdc_PreferredStockOwnershipInterest_81E7E2C8A30458C4EE7AA5515AA9502E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest in preferred stock per depository share</link:label>
    <link:label id="lab_bdc_PreferredStockOwnershipInterest_81E7E2C8A30458C4EE7AA5515AA9502E_label_en-US" xlink:label="lab_bdc_PreferredStockOwnershipInterest_81E7E2C8A30458C4EE7AA5515AA9502E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock, Ownership Interest</link:label>
    <link:label id="lab_bdc_PreferredStockOwnershipInterest_81E7E2C8A30458C4EE7AA5515AA9502E_documentation_en-US" xlink:label="lab_bdc_PreferredStockOwnershipInterest_81E7E2C8A30458C4EE7AA5515AA9502E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Preferred Stock, Ownership Interest</link:label>
    <link:loc xlink:href="bdc-20170702.xsd#bdc_PreferredStockOwnershipInterest" xlink:label="loc_bdc_PreferredStockOwnershipInterest_81E7E2C8A30458C4EE7AA5515AA9502E" xlink:type="locator" />
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    <link:label id="lab_bdc_PreferredStockSharesIssuedPercentage_7AECA5984F98D98D16A0A5515AA93C06_terseLabel_en-US" xlink:label="lab_bdc_PreferredStockSharesIssuedPercentage_7AECA5984F98D98D16A0A5515AA93C06" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of issued shares</link:label>
    <link:label id="lab_bdc_PreferredStockSharesIssuedPercentage_7AECA5984F98D98D16A0A5515AA93C06_label_en-US" xlink:label="lab_bdc_PreferredStockSharesIssuedPercentage_7AECA5984F98D98D16A0A5515AA93C06" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock Shares Issued Percentage</link:label>
    <link:label id="lab_bdc_PreferredStockSharesIssuedPercentage_7AECA5984F98D98D16A0A5515AA93C06_documentation_en-US" xlink:label="lab_bdc_PreferredStockSharesIssuedPercentage_7AECA5984F98D98D16A0A5515AA93C06" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Preferred stock shares issued percentage.</link:label>
    <link:loc xlink:href="bdc-20170702.xsd#bdc_PreferredStockSharesIssuedPercentage" xlink:label="loc_bdc_PreferredStockSharesIssuedPercentage_7AECA5984F98D98D16A0A5515AA93C06" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SaleOfStockPricePerShare_F3F273DB7599D951F2D4A5515AA9D531_terseLabel_en-US" xlink:label="lab_us-gaap_SaleOfStockPricePerShare_F3F273DB7599D951F2D4A5515AA9D531" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Offering price per share</link:label>
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    <link:label id="lab_bdc_PreferredStockConvertedInToCommonStock_41249458BDCC58ED98FDA5515AAAE93E_documentation_en-US" xlink:label="lab_bdc_PreferredStockConvertedInToCommonStock_41249458BDCC58ED98FDA5515AAAE93E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Preferred stock converted in to common stock.</link:label>
    <link:loc xlink:href="bdc-20170702.xsd#bdc_PreferredStockConvertedInToCommonStock" xlink:label="loc_bdc_PreferredStockConvertedInToCommonStock_41249458BDCC58ED98FDA5515AAAE93E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion_66199D9A765DBAD29607A5515AAA3B7A_terseLabel_en-US" xlink:label="lab_us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion_66199D9A765DBAD29607A5515AAA3B7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of common stock issued upon conversion</link:label>
    <link:label id="lab_us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion_66199D9A765DBAD29607A5515AAA3B7A_label_en-US" xlink:label="lab_us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion_66199D9A765DBAD29607A5515AAA3B7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Convertible Preferred Stock, Shares Issued upon Conversion</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion" xlink:label="loc_us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion_66199D9A765DBAD29607A5515AAA3B7A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_36C15DD3604247EB6E70A5515AAA970A_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_36C15DD3604247EB6E70A5515AAA970A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Threshold trading day period (in trading days)</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_DebtInstrumentConvertibleThresholdTradingDays" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_36C15DD3604247EB6E70A5515AAA970A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromIssuanceInitialPublicOffering_80E516AE3F594AD942BFA5515AAAEEA4_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceInitialPublicOffering_80E516AE3F594AD942BFA5515AAAEEA4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from offering, net</link:label>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceInitialPublicOffering_80E516AE3F594AD942BFA5515AAAEEA4_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceInitialPublicOffering_80E516AE3F594AD942BFA5515AAAEEA4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Issuance Initial Public Offering</link:label>
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    <link:label id="lab_us-gaap_PreferredStockDividendsIncomeStatementImpact_C3E04273AB6970D4EF77A5515AAA3361_netLabel_en-US" xlink:label="lab_us-gaap_PreferredStockDividendsIncomeStatementImpact_C3E04273AB6970D4EF77A5515AAA3361" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xml:lang="en-US">Preferred stock dividends</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_C3E04273AB6970D4EF77A5515AAA3361" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StandbyLettersOfCreditMember_E6A3F339F8E61CC0446DA5515B6C3236_terseLabel_en-US" xlink:label="lab_us-gaap_StandbyLettersOfCreditMember_E6A3F339F8E61CC0446DA5515B6C3236" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Standby Letters of Credit</link:label>
    <link:label id="lab_us-gaap_StandbyLettersOfCreditMember_E6A3F339F8E61CC0446DA5515B6C3236_label_en-US" xlink:label="lab_us-gaap_StandbyLettersOfCreditMember_E6A3F339F8E61CC0446DA5515B6C3236" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Standby Letters of Credit [Member]</link:label>
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    <link:label id="lab_us-gaap_SuretyBondMember_2CD03538F714A62DB344A5515B6C066E_terseLabel_en-US" xlink:label="lab_us-gaap_SuretyBondMember_2CD03538F714A62DB344A5515B6C066E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Surety Bonds</link:label>
    <link:label id="lab_us-gaap_SuretyBondMember_2CD03538F714A62DB344A5515B6C066E_label_en-US" xlink:label="lab_us-gaap_SuretyBondMember_2CD03538F714A62DB344A5515B6C066E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Surety Bond [Member]</link:label>
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    <link:label id="lab_us-gaap_GuaranteeObligationsMember_609EA0F4FC5B83541B67A5515B6C22D1_terseLabel_en-US" xlink:label="lab_us-gaap_GuaranteeObligationsMember_609EA0F4FC5B83541B67A5515B6C22D1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Bank Guaranties</link:label>
    <link:label id="lab_us-gaap_GuaranteeObligationsMember_609EA0F4FC5B83541B67A5515B6C22D1_label_en-US" xlink:label="lab_us-gaap_GuaranteeObligationsMember_609EA0F4FC5B83541B67A5515B6C22D1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Guarantee Obligations [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GuaranteeObligationsMember" xlink:label="loc_us-gaap_GuaranteeObligationsMember_609EA0F4FC5B83541B67A5515B6C22D1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GuaranteeObligationsMember_609EA0F4FC5B83541B67A5515B6C22D1" xlink:to="lab_us-gaap_GuaranteeObligationsMember_609EA0F4FC5B83541B67A5515B6C22D1" xlink:type="arc" />
    <link:label id="lab_bdc_SignificantAccountingPoliciesLineItems_904E968301778BFE9424A5515B6CE903_terseLabel_en-US" xlink:label="lab_bdc_SignificantAccountingPoliciesLineItems_904E968301778BFE9424A5515B6CE903" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Significant Accounting Policies [Line Items]</link:label>
    <link:label id="lab_bdc_SignificantAccountingPoliciesLineItems_904E968301778BFE9424A5515B6CE903_label_en-US" xlink:label="lab_bdc_SignificantAccountingPoliciesLineItems_904E968301778BFE9424A5515B6CE903" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Significant Accounting Policies [Line Items]</link:label>
    <link:label id="lab_bdc_SignificantAccountingPoliciesLineItems_904E968301778BFE9424A5515B6CE903_documentation_en-US" xlink:label="lab_bdc_SignificantAccountingPoliciesLineItems_904E968301778BFE9424A5515B6CE903" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Significant Accounting Policies [Line Items]</link:label>
    <link:loc xlink:href="bdc-20170702.xsd#bdc_SignificantAccountingPoliciesLineItems" xlink:label="loc_bdc_SignificantAccountingPoliciesLineItems_904E968301778BFE9424A5515B6CE903" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LossContingencyEstimateOfPossibleLoss_D7A6C454FB4B68D2B1AAA5515B6D5A30_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingencyEstimateOfPossibleLoss_D7A6C454FB4B68D2B1AAA5515B6D5A30" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loss contingency, range of possible loss, portion not accrued</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_LossContingencyEstimateOfPossibleLoss" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_D7A6C454FB4B68D2B1AAA5515B6D5A30" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GainContingencyPatentsAllegedlyInfringedUponNumber_44AFF2EB6E50C1EBCA55A5515B6D0D39_terseLabel_en-US" xlink:label="lab_us-gaap_GainContingencyPatentsAllegedlyInfringedUponNumber_44AFF2EB6E50C1EBCA55A5515B6D0D39" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain contingency, number of patents allegedly infringed upon</link:label>
    <link:label id="lab_us-gaap_GainContingencyPatentsAllegedlyInfringedUponNumber_44AFF2EB6E50C1EBCA55A5515B6D0D39_label_en-US" xlink:label="lab_us-gaap_GainContingencyPatentsAllegedlyInfringedUponNumber_44AFF2EB6E50C1EBCA55A5515B6D0D39" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain Contingency, Patents Allegedly Infringed upon, Number</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainContingencyPatentsAllegedlyInfringedUponNumber" xlink:label="loc_us-gaap_GainContingencyPatentsAllegedlyInfringedUponNumber_44AFF2EB6E50C1EBCA55A5515B6D0D39" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LitigationSettlementAmountAwardedFromOtherParty_80F37B974F1B7174B2DCA5515B6DEC80_terseLabel_en-US" xlink:label="lab_us-gaap_LitigationSettlementAmountAwardedFromOtherParty_80F37B974F1B7174B2DCA5515B6DEC80" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Litigation settlement amount</link:label>
    <link:label id="lab_us-gaap_LitigationSettlementAmountAwardedFromOtherParty_80F37B974F1B7174B2DCA5515B6DEC80_label_en-US" xlink:label="lab_us-gaap_LitigationSettlementAmountAwardedFromOtherParty_80F37B974F1B7174B2DCA5515B6DEC80" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Litigation Settlement, Amount Awarded from Other Party</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_1F9E4B7FC8D7279BC7A9A5515AC5295B_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_1F9E4B7FC8D7279BC7A9A5515AC5295B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of Net Periodic Benefit Costs</link:label>
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    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_97BF4DC463E0DE5BD347A5515B805040_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_97BF4DC463E0DE5BD347A5515B805040" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_24F6358762BB481F2743A5515B816E45_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_24F6358762BB481F2743A5515B816E45" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued liabilities</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_69D162B7A85702E14BD6A5515B8118C9_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_69D162B7A85702E14BD6A5515B8118C9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued taxes</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_4D343B8CF8490B90152BA5515B81D340_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_4D343B8CF8490B90152BA5515B81D340" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other 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_IncreaseDecreaseInOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_4FA154E7EED17BBF34EEA5515B81A76C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BFE5DA5E60D25177C788A5515B82DCDF_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BFE5DA5E60D25177C788A5515B82DCDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_BFE5DA5E60D25177C788A5515B82DCDF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_BFE5DA5E60D25177C788A5515B82DCDF" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BFE5DA5E60D25177C788A5515B82DCDF" xlink:type="arc" />
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