1.0.0.3 false CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data false 1 $ false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 2 $ false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 3 $ false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 4 $ false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDPerShare Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 3 Net sales and revenues: 1 us-gaap_RevenuesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 4 Net sales 2 us-gaap_SalesRevenueNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 276331000 276331 false false 2 true true 307407000 307407 false false 3 true true 721502000 721502 false false 4 true true 774822000 774822 false false No definition available. No authoritative reference available. false 5 Miscellaneous income 2 us-gaap_OtherOperatingIncome us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 1974000 1974 false false 2 false true 1400000 1400 false false 3 false true 9060000 9060 false false 4 false true 9325000 9325 false false No definition available. No authoritative reference available. false 6 Net sales and revenues 2 us-gaap_Revenues us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 278305000 278305 false false 2 false true 308807000 308807 false false 3 false true 730562000 730562 false false 4 false true 784147000 784147 false false No definition available. No authoritative reference available. true 7 Costs and expenses: 1 us-gaap_CostsAndExpensesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 8 Cost of sales (exclusive of depreciation) 2 wlt_CostOfGoodsAndServicesSoldExcludingDepreciation wlt false debit duration monetary The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period... false false false false false false false false false 1 false true 190678000 190678 false false 2 false true 164801000 164801 false false 3 false true 436487000 436487 false false 4 false true 462612000 462612 false false The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period excluding depreciation. No authoritative reference available. false 9 Depreciation 2 us-gaap_Depreciation us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 18214000 18214 false false 2 false true 13525000 13525 false false 3 false true 54216000 54216 false false 4 false true 37833000 37833 false false No definition available. No authoritative reference available. false 10 Selling, general and administrative 2 us-gaap_SellingGeneralAndAdministrativeExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 19238000 19238 false false 2 false true 14036000 14036 false false 3 false true 51091000 51091 false false 4 false true 49693000 49693 false false No definition available. No authoritative reference available. false 11 Postretirement benefits 2 us-gaap_OtherPostretirementBenefitExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 7712000 7712 false false 2 false true 6859000 6859 false false 3 false true 23137000 23137 false false 4 false true 20575000 20575 false false No definition available. No authoritative reference available. false 12 Amortization of intangibles 2 us-gaap_AmortizationOfIntangibleAssets us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 112000 112 false false 2 false true 67000 67 false false 3 false true 335000 335 false false 4 false true 206000 206 false false No definition available. No authoritative reference available. false 13 Costs and expenses 2 us-gaap_CostsAndExpenses us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 235954000 235954 false false 2 false true 199288000 199288 false false 3 false true 565266000 565266 false false 4 false true 570919000 570919 false false No definition available. No authoritative reference available. true 14 Operating income 1 us-gaap_OperatingIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 42351000 42351 false false 2 false true 109519000 109519 false false 3 false true 165296000 165296 false false 4 false true 213228000 213228 false false No definition available. No authoritative reference available. true 15 Interest expense 1 us-gaap_InterestExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -4780000 -4780 false false 2 false true -5478000 -5478 false false 3 false true -13995000 -13995 false false 4 false true -22375000 -22375 false false No definition available. No authoritative reference available. false 16 Interest income 1 us-gaap_InvestmentIncomeInterest us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 152000 152 false false 2 false true 155000 155 false false 3 false true 628000 628 false false 4 false true 520000 520 false false No definition available. No authoritative reference available. false 17 Income from continuing operations before income tax expense 1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 37723000 37723 false false 2 false true 104196000 104196 false false 3 false true 151929000 151929 false false 4 false true 191373000 191373 false false No definition available. No authoritative reference available. true 18 Income tax expense 1 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 13355000 13355 false false 2 false true 32906000 32906 false false 3 false true 43375000 43375 false false 4 false true 57172000 57172 false false No definition available. No authoritative reference available. false 19 Income from continuing operations 1 us-gaap_IncomeLossFromContinuingOperations us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 24368000 24368 false false 2 false true 71290000 71290 false false 3 false true 108554000 108554 false false 4 false true 134201000 134201 false false No definition available. No authoritative reference available. true 20 Loss from discontinued operations 1 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -560000 -560 false false 2 false true -16290000 -16290 false false 3 false true -572000 -572 false false 4 false true -27926000 -27926 false false No definition available. No authoritative reference available. false 21 Net income 1 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 23808000 23808 false false 2 true true 55000000 55000 false false 3 true true 107982000 107982 false false 4 true true 106275000 106275 false false No definition available. No authoritative reference available. true 22 Basic income (loss) per share: 1 us-gaap_EarningsPerShareBasicAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 23 Income from continuing operations (in dollars per share) 2 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.46 0.46 false false 2 true true 1.28 1.28 false false 3 true true 2.05 2.05 false false 4 true true 2.5 2.5 false false No definition available. No authoritative reference available. false 24 Loss from discontinued operations (in dollars per share) 2 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true -0.01 -0.01 false false 2 true true -0.29 -0.29 false false 3 true true -0.01 -0.01 false false 4 true true -0.52 -0.52 false false No definition available. No authoritative reference available. false 25 Net income (in dollars per share) 2 us-gaap_EarningsPerShareBasic us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.45 0.45 false false 2 true true 0.99 0.99 false false 3 true true 2.04 2.04 false false 4 true true 1.98 1.98 false false No definition available. No authoritative reference available. true 26 Diluted income (loss) per share: 1 us-gaap_EarningsPerShareDilutedAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 27 Income from continuing operations (in dollars per share) 2 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.45 0.45 false false 2 true true 1.26 1.26 false false 3 true true 2.02 2.02 false false 4 true true 2.47 2.47 false false No definition available. No authoritative reference available. false 28 Loss from discontinued operations (in dollars per share) 2 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true -0.01 -0.01 false false 2 true true -0.29 -0.29 false false 3 true true -0.01 -0.01 false false 4 true true -0.52 -0.52 false false No definition available. No authoritative reference available. false 29 Net income (in dollars per share) 2 us-gaap_EarningsPerShareDiluted us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.44 0.44 false false 2 true true 0.97 0.97 false false 3 true true 2.01 2.01 false false 4 true true 1.95 1.95 false false No definition available. No authoritative reference available. true 30 Dividends declared per common share (in dollars per share) 1 us-gaap_CommonStockDividendsPerShareDeclared us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.10 0.10 false false 2 true true 0.10 0.10 false false 3 true true 0.30 0.30 false false 4 true true 0.20 0.20 false false No definition available. No authoritative reference available. false false 4 28 false Thousands UnKnown NoRounding false true