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 167005000 167005 false false 2 true true 269439000 269439 false false 3 true true 445171000 445171 false false 4 true true 467415000 467415 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 2115000 2115 false false 2 false true 4969000 4969 false false 3 false true 7086000 7086 false false 4 false true 7926000 7926 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 169120000 169120 false false 2 false true 274408000 274408 false false 3 false true 452257000 452257 false false 4 false true 475341000 475341 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 105343000 105343 false false 2 false true 164123000 164123 false false 3 false true 245809000 245809 false false 4 false true 297811000 297811 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 18268000 18268 false false 2 false true 12180000 12180 false false 3 false true 36002000 36002 false false 4 false true 24308000 24308 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 16188000 16188 false false 2 false true 19192000 19192 false false 3 false true 31853000 31853 false false 4 false true 35657000 35657 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 7781000 7781 false false 2 false true 6860000 6860 false false 3 false true 15425000 15425 false false 4 false true 13717000 13717 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 111000 111 false false 2 false true 67000 67 false false 3 false true 223000 223 false false 4 false true 139000 139 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 147691000 147691 false false 2 false true 202422000 202422 false false 3 false true 329312000 329312 false false 4 false true 371632000 371632 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 21429000 21429 false false 2 false true 71986000 71986 false false 3 false true 122945000 122945 false false 4 false true 103709000 103709 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 -4416000 -4416 false false 2 false true -11183000 -11183 false false 3 false true -9215000 -9215 false false 4 false true -16897000 -16897 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 202000 202 false false 2 false true 185000 185 false false 3 false true 476000 476 false false 4 false true 365000 365 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 17215000 17215 false false 2 false true 60988000 60988 false false 3 false true 114206000 114206 false false 4 false true 87177000 87177 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 5879000 5879 false false 2 false true 15357000 15357 false false 3 false true 30020000 30020 false false 4 false true 24266000 24266 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 11336000 11336 false false 2 false true 45631000 45631 false false 3 false true 84186000 84186 false false 4 false true 62911000 62911 false false No definition available. No authoritative reference available. true 20 Income (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 -265000 -265 false false 2 false true 5145000 5145 false false 3 false true -12000 -12 false false 4 false true -11636000 -11636 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 11071000 11071 false false 2 true true 50776000 50776 false false 3 true true 84174000 84174 false false 4 true true 51275000 51275 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 0.21 0.21 false false 2 true true 0.86 0.86 false false 3 true true 1.58 1.58 false false 4 true true 1.20 1.20 false false No definition available. No authoritative reference available. false 24 Income (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 false false 0 0 false false 2 true true 0.10 0.10 false false 3 false false 0 0 false false 4 true true -0.22 -0.22 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 0.21 0.21 false false 2 true true 0.96 0.96 false false 3 true true 1.58 1.58 false false 4 true true 0.98 0.98 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 0.21 0.21 false false 2 true true 0.85 0.85 false false 3 true true 1.57 1.57 false false 4 true true 1.18 1.18 false false No definition available. No authoritative reference available. false 28 Income (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 false false 0 0 false false 2 true true 0.09 0.09 false false 3 false false 0 0 false false 4 true true -0.22 -0.22 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 0.21 0.21 false false 2 true true 0.94 0.94 false false 3 true true 1.57 1.57 false false 4 true true 0.96 0.96 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 0.05 0.05 false false 3 true true 0.20 0.20 false false 4 true true 0.10 0.10 false false No definition available. No authoritative reference available. false false 4 28 false Thousands UnKnown Hundreds false true