1.0.0.3 false Related Party Transactions 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 2 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 0 wlt_NotesToConsolidatedFinancialsAbstract wlt false na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false No definition available. false 3 Related Party Transactions 1 us-gaap_RelatedPartyTransactionsDisclosureTextBlock us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 <table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td> <p style="FONT-FAMILY: times"><font size="2"><b>NOTE 17&#151;Related Party Transactions</b></font></p> <p style="FONT-FAMILY: times"><font size="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Company owns a 50% interest in the joint venture Black Warrior Methane ("BWM"), which is accounted for under the proportionate consolidation method. The Company has granted the rights to produce and sell methane gas from its coal mines to BWM. The Company also supplies labor to BWM and incurs costs, including property and liability insurance, to support the joint venture. The Company charges the joint venture for such costs on a monthly basis. These charges for 2009, 2008 and 2007 were $2.5&nbsp;million, $2.0&nbsp;million and $2.1&nbsp;million, respectively.</font></p></td></tr></table> NOTE 17&#151;Related Party Transactions &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Company owns a 50% interest in the joint venture Black Warrior false false No definition available. No authoritative reference available. false false 1 2 false UnKnown UnKnown UnKnown false true