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Derivative Instruments (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Effect of Cash Flow Hedges on the Consolidated Balance Sheet    
Asset fair value $ 8,600us-gaap_DerivativeFairValueOfDerivativeAsset  
Designated as Hedging Instrument | Commodity Contract | Derivative asset    
Effect of Cash Flow Hedges on the Consolidated Balance Sheet    
Asset fair value 8,631us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= pq_HedgeAssetMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 521us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= pq_HedgeAssetMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Designated as Hedging Instrument | Commodity Contract | Derivative liability    
Effect of Cash Flow Hedges on the Consolidated Balance Sheet    
Liability fair value   $ (1,617)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= pq_HedgeLiabilityMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember