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Discontinued Operations (Details) (Kodiak, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Kodiak
 
Discontinued Operations  
Cash proceeds received $ 9.5us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= wlt_KodiakMiningCompanyLLCMember
Gain on sale of discontinued operations 8.2us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= wlt_KodiakMiningCompanyLLCMember
Income from discontinued operations $ 5.2us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= wlt_KodiakMiningCompanyLLCMember