1.0.0.3 false CONSOLIDATED STATEMENTS OF OPERATIONS (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 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 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 955508000 955508 false false 2 true true 1135745000 1135745 false false 3 true true 745236000 745236 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 11319000 11319 false false 2 false true 13939000 13939 false false 3 false true 29559000 29559 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 966827000 966827 false false 2 false true 1149684000 1149684 false false 3 false true 774795000 774795 false false No definition available. No authoritative reference available. true 7 Cost 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 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 586774000 586774 false false 2 false true 628325000 628325 false false 3 false true 496284000 496284 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 72939000 72939 false false 2 false true 56542000 56542 false false 3 false true 39234000 39234 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 70063000 70063 false false 2 false true 63394000 63394 false false 3 false true 55182000 55182 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 30833000 30833 false false 2 false true 27557000 27557 false false 3 false true 27750000 27750 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 447000 447 false false 2 false true 273000 273 false false 3 false true 351000 351 false false No definition available. No authoritative reference available. false 13 Restructuring and impairment charges 2 us-gaap_RestructuringSettlementAndImpairmentProvisions us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 3601000 3601 false false 2 false true 32386000 32386 false false 3 false false 0 0 false false No definition available. No authoritative reference available. false 14 Cost 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 764657000 764657 false false 2 false true 808477000 808477 false false 3 false true 618801000 618801 false false No definition available. No authoritative reference available. true 15 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 202170000 202170 false false 2 false true 341207000 341207 false false 3 false true 155994000 155994 false false No definition available. No authoritative reference available. true 16 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 -18975000 -18975 false false 2 false true -26226000 -26226 false false 3 false true -18830000 -18830 false false No definition available. No authoritative reference available. false 17 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 799000 799 false false 2 false true 17808000 17808 false false 3 false true 2545000 2545 false false No definition available. No authoritative reference available. false 18 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 183994000 183994 false false 2 false true 332789000 332789 false false 3 false true 139709000 139709 false false No definition available. No authoritative reference available. true 19 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 42144000 42144 false false 2 false true 101597000 101597 false false 3 false true 41482000 41482 false false No definition available. No authoritative reference available. false 20 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 141850000 141850 false false 2 false true 231192000 231192 false false 3 false true 98227000 98227 false false No definition available. No authoritative reference available. true 21 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 -4692000 -4692 false false 2 false true 115388000 115388 false false 3 false true 13772000 13772 false false No definition available. No authoritative reference available. false 22 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 137158000 137158 false false 2 true true 346580000 346580 false false 3 true true 111999000 111999 false false No definition available. No authoritative reference available. true 23 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 No definition available. false 24 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 2.67 2.67 false false 2 true true 4.30 4.30 false false 3 true true 1.89 1.89 false false No definition available. No authoritative reference available. false 25 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 true true -0.09 -0.09 false false 2 true true 2.14 2.14 false false 3 true true 0.26 0.26 false false No definition available. No authoritative reference available. false 26 Basic net income per share (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 2.58 2.58 false false 2 true true 6.44 6.44 false false 3 true true 2.15 2.15 false false No definition available. No authoritative reference available. true 27 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 No definition available. false 28 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 2.64 2.64 false false 2 true true 4.24 4.24 false false 3 true true 1.87 1.87 false false No definition available. No authoritative reference available. false 29 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 true true -0.09 -0.09 false false 2 true true 2.11 2.11 false false 3 true true 0.26 0.26 false false No definition available. No authoritative reference available. false 30 Diluted net income per share (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 2.55 2.55 false false 2 true true 6.35 6.35 false false 3 true true 2.13 2.13 false false No definition available. No authoritative reference available. true false 3 28 false Thousands UnKnown Hundreds false true