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Discontinued Operations and Other (Details 2) (Facility Closing, USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Facility Closing
     
Other      
Current liabilities $ 500,000us-gaap_OtherAccruedLiabilitiesCurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
  $ 1,800,000us-gaap_OtherAccruedLiabilitiesCurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Noncurrent liabilities 4,100,000us-gaap_OtherAccruedLiabilitiesNoncurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
  6,800,000us-gaap_OtherAccruedLiabilitiesNoncurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Payments for natural gas contract 100,000wpp_PaymentForSettlementOfRestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
   
Net credits 3,900,000wpp_RestructuringChargesNetCredits
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
   
Restructuring charges within selling and administrative expenses   $ 0us-gaap_OtherRestructuringCosts
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember