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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net earnings (loss) $ 442us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (4,900)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Provision for depreciation, depletion, and amortization 10,441us-gaap_DepreciationDepletionAndAmortization 10,289us-gaap_DepreciationDepletionAndAmortization
(Gain) loss on sale of assets (797)us-gaap_GainLossOnSaleOfPropertyPlantEquipment 351us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Deferred income taxes 373wpp_DeferredIncomeTaxNoncashExpenseBenefit (2,835)wpp_DeferredIncomeTaxNoncashExpenseBenefit
Other non-cash items 932us-gaap_OtherNoncashIncomeExpense 704us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:    
Receivables (2,300)us-gaap_IncreaseDecreaseInReceivables 4,477us-gaap_IncreaseDecreaseInReceivables
Inventories (639)us-gaap_IncreaseDecreaseInInventories (5,304)us-gaap_IncreaseDecreaseInInventories
Other assets (4,139)us-gaap_IncreaseDecreaseInOtherOperatingAssets (5,256)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and other (7,846)us-gaap_IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities (4,851)us-gaap_IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities
Net cash used in operating activities (3,533)us-gaap_NetCashProvidedByUsedInOperatingActivities (7,325)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Capital expenditures (2,900)us-gaap_PaymentsToAcquireProductiveAssets (6,834)us-gaap_PaymentsToAcquireProductiveAssets
Proceeds from sale of assets 853us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 91us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash used in investing activities (2,047)us-gaap_NetCashProvidedByUsedInInvestingActivities (6,743)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Borrowings under credit agreements 8,500us-gaap_ProceedsFromLinesOfCredit  
Payments under credit agreements (438)us-gaap_RepaymentsOfLinesOfCredit  
Proceeds from stock option exercises   1,450us-gaap_ProceedsFromStockOptionsExercised
Dividends paid (1,500)us-gaap_PaymentsOfDividendsCommonStock (1,488)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by (used in) financing activities 6,562us-gaap_NetCashProvidedByUsedInFinancingActivities (38)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash and cash equivalents 982us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (14,106)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 2,675us-gaap_CashAndCashEquivalentsAtCarryingValue 19,594us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period $ 3,657us-gaap_CashAndCashEquivalentsAtCarryingValue $ 5,488us-gaap_CashAndCashEquivalentsAtCarryingValue