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Supplemental Guarantor and Non-Guarantor Financial Information (Narrative) (Details)
 3 Months Ended
Mar. 31, 2015
Debt Instrument [Line Items]  
Percentage of ownership interest in subsidiaries 100.00%wlt_OwnershipInterestPercentage
9.875% senior notes  
Debt Instrument [Line Items]  
Interest rate (as a percent) 9.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wlt_SeniorNotes9.875PercentageMember
8.50% senior notes  
Debt Instrument [Line Items]  
Interest rate (as a percent) 8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wlt_SeniorNotes8.50PercentageMember