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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net loss $ (13,878)us-gaap_ProfitLoss $ (19,030)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion and amortization 38,059us-gaap_DepreciationDepletionAndAmortization 16,059us-gaap_DepreciationDepletionAndAmortization
Accretion of asset retirement obligation and receivable 7,031us-gaap_AccretionExpenseIncludingAssetRetirementObligations 3,479us-gaap_AccretionExpenseIncludingAssetRetirementObligations
Non-cash tax benefits (575)us-gaap_OtherNoncashIncomeTaxExpense (138)us-gaap_OtherNoncashIncomeTaxExpense
Amortization of intangible assets and liabilities, net (253)wlb_AmortizationOfIntangibleAssetsAndLiabilitiesNet 153wlb_AmortizationOfIntangibleAssetsAndLiabilitiesNet
Share-based compensation 1,522us-gaap_ShareBasedCompensation 728us-gaap_ShareBasedCompensation
Loss on sale/disposal of assets 229us-gaap_GainLossOnDispositionOfAssets 38us-gaap_GainLossOnDispositionOfAssets
Non-cash interest expense 1,327wlb_NoncashInterestExpense 0wlb_NoncashInterestExpense
Amortization of deferred financing costs 2,532us-gaap_AmortizationOfFinancingCosts 271us-gaap_AmortizationOfFinancingCosts
Other (29)us-gaap_OtherNoncashIncomeExpense 0us-gaap_OtherNoncashIncomeExpense
Gain on sales of investment securities (15)us-gaap_GainOnSaleOfInvestments 0us-gaap_GainOnSaleOfInvestments
Gain on derivative (5,276)us-gaap_UnrealizedGainLossOnDerivatives 0us-gaap_UnrealizedGainLossOnDerivatives
Loss (gain) on foreign exchange (2,109)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 6,790us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Income from equity affiliates (2,025)us-gaap_IncomeLossFromEquityMethodInvestments 0us-gaap_IncomeLossFromEquityMethodInvestments
Distributions from equity affiliates 144us-gaap_EquityMethodInvestmentDividendsOrDistributions 0us-gaap_EquityMethodInvestmentDividendsOrDistributions
Changes in operating assets and liabilities:    
Receivables (15,899)us-gaap_IncreaseDecreaseInReceivables 5,202us-gaap_IncreaseDecreaseInReceivables
Inventories (4,957)us-gaap_IncreaseDecreaseInInventories 4,525us-gaap_IncreaseDecreaseInInventories
Excess of black lung benefit obligation over trust assets 664us-gaap_IncreaseDecreaseInPneumoconiosisBenefitObligationsNoncurrent 701us-gaap_IncreaseDecreaseInPneumoconiosisBenefitObligationsNoncurrent
Deferred income tax 2,766us-gaap_IncreaseDecreaseInDeferredIncomeTaxes 0us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Accounts payable and accrued expenses 12,336us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities 10,959us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
Deferred revenue 605us-gaap_IncreaseDecreaseInDeferredRevenue (1,302)us-gaap_IncreaseDecreaseInDeferredRevenue
Income tax payable (481)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 28us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Accrual for workers' compensation (1,158)us-gaap_IncreaseDecreaseInWorkersCompensationLiabilities (69)us-gaap_IncreaseDecreaseInWorkersCompensationLiabilities
Asset retirement obligation (4,838)us-gaap_IncreaseDecreaseInAssetRetirementObligations (1,352)us-gaap_IncreaseDecreaseInAssetRetirementObligations
Accrual for postretirement medical benefits 424us-gaap_IncreaseDecreaseInPostretirementObligations 906us-gaap_IncreaseDecreaseInPostretirementObligations
Pension and SERP obligations 1,211us-gaap_IncreaseDecreaseInPensionPlanObligations (293)us-gaap_IncreaseDecreaseInPensionPlanObligations
Other assets and liabilities (15,717)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 1,993us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities 1,640us-gaap_NetCashProvidedByUsedInOperatingActivities 29,648us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Additions to property, plant and equipment (13,027)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,050)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Change in restricted investments and bond collateral and reclamation deposits 538us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments (465,544)us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments
Cash released from escrow for acquisition 34,000wlb_PaymentsinEscrowforFutureAcquisitions 0wlb_PaymentsinEscrowforFutureAcquisitions
Cash payments related to acquisitions and other (35,887)us-gaap_PaymentsToAcquireBusinessesGross 0us-gaap_PaymentsToAcquireBusinessesGross
Cash acquired related to acquisitionss 2,783us-gaap_CashAcquiredFromAcquisition 0us-gaap_CashAcquiredFromAcquisition
Net proceeds from sales of assets 1,123us-gaap_ProceedsFromSaleOfOtherProductiveAssets 0us-gaap_ProceedsFromSaleOfOtherProductiveAssets
Proceeds from sale of restricted investments 1,568us-gaap_ProceedsFromSaleOfRestrictedInvestments 0us-gaap_ProceedsFromSaleOfRestrictedInvestments
Payments related to loan and lease receivables (1,044)wlb_IncreaseDecreaseinLoansReceivable 0wlb_IncreaseDecreaseinLoansReceivable
Receipts from loan and lease receivables 2,591us-gaap_ProceedsFromCollectionOfLoansReceivable 0us-gaap_ProceedsFromCollectionOfLoansReceivable
Receivable from customer for property and equipment purchases 0us-gaap_IncreaseDecreaseInOtherReceivables (10)us-gaap_IncreaseDecreaseInOtherReceivables
Other (3,295)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (60)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (10,650)us-gaap_NetCashProvidedByUsedInInvestingActivities (468,664)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Change in book overdrafts 420us-gaap_ProceedsFromRepaymentsOfBankOverdrafts (315)us-gaap_ProceedsFromRepaymentsOfBankOverdrafts
Borrowings from long-term debt, net of debt discount 79,359us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt 454,219us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
Repayments of long-term debt (17,160)us-gaap_RepaymentsOfOtherLongTermDebt (6,239)us-gaap_RepaymentsOfOtherLongTermDebt
Borrowings on revolving lines of credit 32,675us-gaap_ProceedsFromLongTermLinesOfCredit 0us-gaap_ProceedsFromLongTermLinesOfCredit
Repayments of revolving lines of credit (42,251)us-gaap_RepaymentsOfLongTermLinesOfCredit 0us-gaap_RepaymentsOfLongTermLinesOfCredit
Debt issuance costs and other refinancing costs (2,806)us-gaap_PaymentsOfDebtIssuanceCosts (7,598)us-gaap_PaymentsOfDebtIssuanceCosts
Preferred dividends paid (3)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock (261)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Proceeds from issuance of common shares 0us-gaap_ProceedsFromIssuanceOfCommonStock 0us-gaap_ProceedsFromIssuanceOfCommonStock
Exercise of stock options 0us-gaap_ProceedsFromStockOptionsExercised 0us-gaap_ProceedsFromStockOptionsExercised
Redemption of preferred stock (319)us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock 0us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock
Net cash provided by financing activities 49,915us-gaap_NetCashProvidedByUsedInFinancingActivities 439,806us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of foreign exchange rates on cash (1,770)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase in cash and cash equivalents 39,135us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 790us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 14,258us-gaap_CashAndCashEquivalentsAtCarryingValue 61,110us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 53,393us-gaap_CashAndCashEquivalentsAtCarryingValue 61,900us-gaap_CashAndCashEquivalentsAtCarryingValue
Non-cash transactions:    
Accrued purchases of property and equipment 8,107us-gaap_CapitalExpendituresIncurredButNotYetPaid 983us-gaap_CapitalExpendituresIncurredButNotYetPaid
Capital leases and other financing sources $ 12,700wlb_CapitalLeasesAndOtherFinancingSources $ 12,936wlb_CapitalLeasesAndOtherFinancingSources