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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net income including non-controlling interests | $ 253,880 us-gaap_ProfitLoss | $ 291,687 us-gaap_ProfitLoss | $ 257,216 us-gaap_ProfitLoss
Unrealized (loss) gain on derivatives designated and qualifying as cash flow hedges, net of tax of $(121) in 2014; $(141) in 2013; $(201) in 2012 | (378)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | 289 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | (832)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Defined pension plan activity, net of tax of $(20,951) in 2014, $60,556 in 2013; $(3,492) in 2012 | (37,200)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | 101,151 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | (6,475)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Currency translation adjustment | (98,365)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | (19,955)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | 19,635 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Transactions with non-controlling interests | (4)leco_MinorityInterestDecreasefromTransactionswithNoncontrollingInterestHolders | 155 leco_MinorityInterestDecreasefromTransactionswithNoncontrollingInterestHolders | 0 leco_MinorityInterestDecreasefromTransactionswithNoncontrollingInterestHolders
Other comprehensive income (loss) | (135,947)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 81,640 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 12,328 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income | 117,933 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 373,327 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 269,544 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Comprehensive (loss) income attributable to non-controlling interests | (72)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | (3,912)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | (348)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income attributable to shareholders | 118,005 us-gaap_ComprehensiveIncomeNetOfTax | 377,239 us-gaap_ComprehensiveIncomeNetOfTax | 269,892 us-gaap_ComprehensiveIncomeNetOfTax
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Unrealized (loss) gain on derivatives designated and qualifying as cash flow hedges, net of tax of $(121) in 2014; $(141) in 2013; $(201) in 2012 | (378)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 289 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (832)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Defined pension plan activity, net of tax of $(20,951) in 2014, $60,556 in 2013; $(3,492) in 2012 | (37,200)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 101,151 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (6,475)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Currency translation adjustment | $ (99,099)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (18,136)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 19,788 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember

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- Definition Decrease in noncontrolling interest balance due to transaction with noncontrolling interest holder, including but not limited to, purchasing of interests from noncontrolling interest holder and the payment of dividends from non-wholly owned subsidiary, included in the consolidation of the parent entity, to the non controlling interest holders. + References No definition available. + Details
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